Crystal structure of the high-energy-density material guanylurea dipicryl­amide

Deblitz, R.; Hrib, C.G.; Hilfert, L.; Edelmann, F.T.

doi:10.1107/S1600536814017164

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ISSN: 2056-9890

Volume 70| Part 8| August 2014| Pages 111-114

doi:10.1107/S1600536814017164

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Crystal structure of the high-energy-density material guanylurea dipicrylamide

Raik Deblitz,^a Cristian G. Hrib,^a Liane Hilfert ^a and Frank T. Edelmann ^a ^*

^aChemisches Institut, Otto-von-Guericke-Universitaet Magdeburg, Universitaetsplatz 2, D-39106 Magdeburg, Germany
^*Correspondence e-mail: frank.edelmann@ovgu.de

Edited by M. Zeller, Youngstown State University, USA (Received 18 July 2014; accepted 24 July 2014; online 31 July 2014)

The title compound, 1-carbamoylguanidinium bis(2,4,6-trinitrophenyl)amide [H₂NC(=O)NHC(NH₂)₂]⁺[N{C₆H₂(NO₂)₃-2,4,6}₂]⁻ (= guanylurea dipicrylamide), was prepared as dark-red block-like crystals in 70% yield by salt-metathesis reaction between guanylurea sulfate and sodium dipicrylamide. In the solid state, the new compound builds up an array of mutually linked guanylurea cations and dipicrylamide anions. The crystal packing is dominated by an extensive network of N—H⋯O hydrogen bonds, resulting in a high density of 1.795 Mg m⁻³, which makes the title compound a potential secondary explosive.

Keywords: crystal structure; high-energy-density material; guanylurea dipicrylamide; hydrogen bonding; dipicrylamides; energetic compounds; guanylurea salts.

CCDC reference: 1015895

1. Chemical context

High-energy-density materials (HEDMs) form an important class of explosive compounds. Several significant advantages such as high heats of combustion, high propulsive power, high specific impulse, as well as smokeless combustion make them highly useful as propellants, explosives, and pyrotechnics (Oestmark et al., 2007 ; Rice et al., 2007 ; Badgujar et al., 2008 ; Göbel & Klapötke, 2009 ; Nair et al., 2010 ; Klapötke, 2011 ). An important class of such high-energy-density materials are polynitro aromatics such as trinitrotoluene (TNT), picric acid, trinitroresorcinol (= styphnic acid), and 2,2′,4,4′,6,6′-hexanitrodiphenylamine (= dipcrylamine). Dipicrylamine combines several very interesting structural features: It contains six nitro groups, which are flexible and can interact and adjust in the crystal lattice. Moreover, dipicrylamine has a secondary amine group which can be deprotonated with alkali and alkaline earth-metal hydroxides to form water-soluble dipicrylamide salts. In the resulting dipicrylamide anion (= DPA⁻), partial delocalization of the negative charge mediated by the aromatic rings is possible, which may facilitate coordination of the oxygen atoms of the nitro groups with suitable metal ions (Eringathodi et al., 2005 ; Agnihotri et al., 2006 ). Moreover, the DPA⁻ anion has various sites which are capable of forming different types of hydrogen bonds in the solid state.

The ammonium salt of dipicrylamine, also known as Aurantia or Imperial Yellow, was discovered in 1874 by Gnehm and used as a yellow colorant for leather, wool, and silk until the early 20^th century (Gnehm, 1874 , 1876 ). However, these practical uses have been terminated due to the highly toxic and explosive nature of dipicrylamine (Kjelland, 1971 ). Dipicrylamine can also be used for the extraction of K⁺ ions from sea bittern, which contains a mixture of K⁺, Na⁺, and Mg²⁺ salts (Winkel & Maas, 1936 ). A related study carried out with a mixture of K⁺, Rb⁺, and Cs⁺ ions revealed that the Cs⁺ ion shows maximum selectivity towards DPA⁻ (Bray et al., 1962 ). In fact, it has been reported that DPA⁻ can be used for the recovery of Cs⁺ from radioactive wastes (Kyrš et al., 1960 ). Only in recent years has the structural chemistry of alkali metal and alkaline earth metal as well as ammonium and azolium dipicrylamides been investigated in detail. All these compounds were found to display interesting hydrogen-bonded supramolecular structures in the solid state (Eringathodi et al., 2005; Agnihotri et al., 2006; Huang et al., 2011 ).

2. Spectroscopic features

In the course of our ongoing studies on the crystal structures of energetic compounds (Deblitz et al. 2012a ,b ; Stock et al., 2014 ), we investigated the preparation and structural characterization of the title compound, guanylurea dipicrylamide, [H₂NC(=O)NHC(NH₂)₂]₂[N{C₆H₂(NO₂)₃-2,4,6}₂]. The guanylurea cation has frequently been reported to be a useful component in energetic nitrogen-rich salts, e.g. guanylurea dinitramide (Langlet, 1998 ) or guanylurea tetrazolate salts (Wang et al., 2009 ). An aqueous solution of sodium dipicrylamide was prepared in situ by deprotonating dipicrylamine with NaOH. Treatment of this dark-red solution with solid 1-carbamoylguanidinium sulfate, [H₂NC(=O)NHC(NH₂)₂]₂SO₄ (also known as guanylurea sulfate) (Lotsch & Schnick, 2005 ), afforded dark-red block-like crystals of the title compound after undisturbed standing of the reaction mixture for 10 d. The product was characterized by spectroscopic methods and elemental analysis. The ¹H NMR spectrum displayed a sharp singlet at δ = 8.78 p.p.m. for the aromatic protons of the DPA⁻ anion, which is in excellent agreement with the literature values (Eringathodi et al., 2005; Agnihotri et al., 2006; Huang et al., 2011). However, the NH and NH₂ protons only gave rise to two very broad resonances spread over a range of ca 4 p.p.m. [δ(C(O)NH₂] = ca 6.3–7.1 p.p.m., δ[NHC(NH₂)₂] = ca 3.3–5.8 p.p.m.). In contrast, interpretation of the ¹³C NMR spectrum was straightforward. In perfect agreement with the ¹³C NMR data of previously reported ammonium and azolium DPA salts (Huang et al., 2011), the spectrum of the title compound displayed signals of the aromatic ring carbons at δ = 143.4, 139.5, 132.6, and 125.1 p.p.m. The two carbon resonances of the guanylurea cation were well separated at δ = 157.4 p.p.m. (C=O) and δ = 155.5 p.p.m. [NHC(NH₂)₂). IR bands in the range of 3200–3400 cm⁻¹ were characteristic for the N—H valence vibrations in the guanylurea cation. A strong carbonyl band was observed at 1632 cm⁻¹, whereas the band at 1532 cm⁻¹ is characteristic for the nitro groups.

3. Structural commentary

Single crystals obtained directly from the reaction mixture were found to be suitable for X-ray diffraction. The title compound crystallizes in the triclinic space group P $[\overline{1}]$ . The crystal structure consists of mutually linked 1-carbamoylguanidinium cations and dipicrylamide anions (Fig. 1). The angle C1—N1—C7 at the amide nitrogen atom of the DPA⁻ anion is 131.66 (10)°, with C—N bond lengths of 1.3021 (15) (C1—N1) and 1.3403 (15) Å (C7—N1). These values are somewhat shorter than the C—N bond lengths in free dipicrylamine (1.373, 1.375 Å; Huang et al., 2011) but comparable to those reported for related azolium dipicrylamides which have central C—N bond lengths in the range of 1.281–1.338 Å (Huang et al., 2011). These values indicate delocalization of the nitrogen lone pair on N1 in dipicrylamide salts, thereby stabilizing the anion by strengthening the C1—N1 and C7—N1 bonds. As a structural consequence, not only is the central C1—N1—C7 angle widened, but there is also a significant elongation of the four C—C bonds adjacent to C1 and C7 (average 1.433 Å) as compared to the other aromatic C—C bonds (average 1.378 Å). The C—N bond lengths in the nearly planar (r.m.s. deviation = 0.0371 Å) 1-carbamoylguanidinium cation also indicate significant electron delocalization. The geometry around the carbon atom in the amidinium fragment NHC(NH₂)₂ is nearly trigonal-planar with N—C—N angles between 117.52 (11) and 121.48 (11)° and C—N distances in the very narrow range of 1.3064 (15)–1.3158 (15) Å. Overall, the structural parameters of the cation in the title compound do not differ significantly from those in 1-carbamoylguanidinium sulfate, [H₂NC(=O)NHC(NH₂)₂]₂SO₄ (Lotsch & Schnick, 2005).

Figure 1
Molecular structure of the title compound. Displacement ellipsoids represent 50% probability levels.

4. Supramolecular features

Both the cation and the anion comprise numerous sites capable of forming different types of hydrogen bonds. Thus it is not surprising that the crystal packing (Fig. 2) is controlled by an extensive hydrogen-bonding network (Table. 1). Six distinct N—H⋯O hydrogen bonds are found in the crystal packing of the title compound. First of all, pairs of cations are formed through dimerization via two N—H⋯O hydrogen bonds between the ureic fragments, which is also very typical for carboxylic amides. Furthermore, the NH₂ groups in the amidinium fragments NHC(NH₂)₂ engage in four N—H⋯O hydrogen bonds to three different nitro groups of the DPA⁻ anion. The calculated density of 1.795 Mg m⁻³ is not only higher than the densities reported for other DPA-based salts (1.69–1.78 Mg m⁻³), but also much higher than the density of TNT (1.65 Mg m⁻³) (Huang et al., 2011). The high density of the title compound can be traced back in large part to the hydrogen bonding in the crystal structure. The energetic properties (e.g. impact and friction sensitivity) of guanylurea dipicrylamide have not been tested, but recent findings have shown that the impact sensitivities of various ammonium and azolium dipicrylamides are in the range of that of the secondary explosive TNT (Huang et al., 2011).

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N8—H8A⋯O13ⁱ	0.87 (2)	2.11 (2)	2.9507 (17)	163.1 (18)
N8—H8B⋯O3ⁱⁱ	0.85 (2)	2.434 (19)	3.1495 (18)	142.4 (16)
N10—H10A⋯O13	0.86 (2)	1.98 (2)	2.6403 (16)	132.2 (17)
N10—H10A⋯O9ⁱⁱⁱ	0.86 (2)	2.26 (2)	2.7991 (17)	120.7 (16)
N11—H11A⋯O1^iv	0.859 (19)	2.222 (18)	2.7590 (16)	120.5 (15)
N11—H11B⋯O6	0.85 (2)	2.15 (2)	2.9833 (17)	167.7 (18)
Symmetry codes: (i) -x+1, -y+2, -z; (ii) -x, -y+1, -z+1; (iii) -x+2, -y+1, -z; (iv) x+1, y, z.

Figure 2
A packing diagram of the title compound. Dashed lines indicate N—H⋯O hydrogen-bonding interactions.

5. Synthesis and crystallization

Cautionary note: Dipicrylamine and dipicrylamide salts are potentially explosive and should be handled only in small amounts using proper safety equipment (Klapötke, 2011).

Preparation of guanylurea dipicrylamide: To a suspension of dipicrylamine (1.0 g, 2.3 mmol) in 10 ml water were added two pellets of NaOH to give a dark red solution of sodium dipicrylamide; 0.23 g (1.5 mmol) of guanylurea sulfate were added as solid, and the mixture was allowed to stand undisturbed at room temperature. After 10 d, 0.87 g (70%) dark-red crystals of the title compound had formed, which were isolated by filtration and dried in air. Analysis calculated for C₁₄H₁₁N₁₁O₁₃ (541.3 g/mol): C 31.06, H 2.05, N, 28.46; found: C 31.87, H 2.27, N 28.10%. IR (KBr pellet): ν_max 3403 (vs), 2171 (w), 1632 (vs), 1532 (s), 1402 (vs), 1270 (s), 1129 (m), 924 (w), 878 (m), 840 (w), 773 (w), 701 (m), 622 (m), 452 (m). ¹H NMR (600 MHz, acetone-d₆, 298 K): δ = 8.78 (s, 4 H, C₆H₂(NO₂)₃), ca 6.3–7.1 [vbr, 2 H, C(O)NH₂], ca 3.3–5.8 [vbr, 5 H, NHC(NH₂)₂] p.p.m. ¹³C NMR (150.9 MHz, acetone-d₆, 298 K): δ = 157.4 (C=O); 155.5 [NHC(NH₂)₂]; 143.4, 139.5, 132.6, 125.1 [C₆H₂(NO₂)₃] p.p.m.

6. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. Positions and isotropic thermal parameters of hydrogen atoms were freely refined.

Table 2
Experimental details

Crystal data
Chemical formula	C₂H₇N₄O⁺·C₁₂H₄N₇O₁₂⁻
M_r	541.34
Crystal system, space group	Triclinic, P $[\overline{1}]$
Temperature (K)	173
a, b, c (Å)	7.9764 (16), 8.6658 (17), 15.278 (3)
α, β, γ (°)	87.79 (3), 76.18 (3), 77.59 (3)
V (Å³)	1001.4 (3)
Z	2
Radiation type	Mo Kα
μ (mm⁻¹)	0.16
Crystal size (mm)	0.40 × 0.20 × 0.10

Data collection
Diffractometer	Stoe IPDS 2T
Absorption correction	For a sphere [the interpolation procedure of Dwiggins (1975 ) was used with some modification]
T_min, T_max	0.861, 0.862
No. of measured, independent and observed [I > 2σ(I)] reflections	12316, 5347, 4600
R_int	0.029
(sin θ/λ)_max (Å⁻¹)	0.685

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.037, 0.097, 1.02
No. of reflections	5347
No. of parameters	387
H-atom treatment	All H-atom parameters refined
Δρ_max, Δρ_min (e Å⁻³)	0.38, −0.24
Computer programs: X-AREA and X-RED (Stoe & Cie, 2002 ) and SHELXS97, SHELXL97 and XP in SHELXTL (Sheldrick, 2008 ).

Supporting information

CCDC reference: 1015895

Crystal structure: contains datablocks I, New_Global_Publ_Block. DOI: 10.1107/S1600536814017164/zl2596sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536814017164/zl2596Isup2.hkl

Supporting information file. DOI: 10.1107/S1600536814017164/zl2596Isup3.cml

checkCIF report

Chemical context top

High-energy-density materials (d) form an important class of explosive compounds. Several significant advantages such as high heats of combustion, high propulsive power, high specific impulse, as well as smokeless combustion make them highly useful as propellants, explosives, and pyrotechnics (Oestmark et al., 2007; Rice et al., 2007; Badgujar et al., 2008; Göbel & Klapötke, 2009; Nair et al., 2010; Klapötke, 2011). An important class of such high-energy-density materials are polynitro aromatics such as trinitrotoluene (TNT), picric acid, trinitroresorcinol (= styphnic acid), and 2,2',4,4',6,6'-hexanitrodiphenylamine (= dipcrylamine). Dipicrylamine combines several very interesting structural features: It contains six nitro groups, which are flexible and can interact and adjust in the crystal lattice. Moreover, dipicrylamine has a secondary amine group which can be deprotonated with alkali and alkaline earth-metal hydroxides to form water-soluble dipicrylamide salts. In the resulting dipicrylamide anion (= DPA^-), partial delocalization of the negative charge mediated by the aromatic rings is possible, which may facilitate coordination of the oxygen atoms of the nitro groups with suitable metal ions (Eringathodi et al., 2005; Agnihotri et al., 2006). Moreover, the DPA^- anion has various sites which are capable of forming different types of hydrogen bonds in the solid state.

The ammonium salt of dipicrylamine, also known as Aurantia or Imperial Yellow, was discovered in 1874 by Gnehm and used as a yellow colorant for leather, wool, and silk until the early 20^th century (Gnehm, 1874, 1876). However, these practical uses have been terminated due to the highly toxic and explosive nature of dipicrylamine (Kjelland, 1971). Dipicrylamine can also be used for the extraction of K⁺ ions from sea bittern, which contains a mixture of K⁺, Na⁺, and Mg²⁺ salts (Winkel & Maas, 1936). A related study carried out with a mixture of K⁺, Rb⁺, and Cs⁺ ions revealed that the Cs⁺ ion shows maximum selectivity towards DPA^- (Bray et al., 1962). In fact, it has been reported that DPA^- can be used for the recovery of Cs⁺ from radioactive wastes (Kyrš et al., 1960). Only in recent years has the structural chemistry of alkali metal and alkaline earth metal as well as ammonium and azolium dipicrylamides been investigated in detail. All these compounds were found to display interesting hydrogen-bonded supramolecular structures in the solid state (Eringathodi et al., 2005; Agnihotri et al., 2006; Huang et al., 2011).

Spectroscopic features top

In the course of our ongoing studies on the crystal structures of energetic compounds (Deblitz et al. 2012a,b; Stock et al., 2014), we investigated the preparation and structural characterization of the title compound, guanylurea dipicrylamide, [H₂NC(=O)NHC(NH₂)₂]₂[N{C₆H₂(NO₂)₃-2,4,6}₂]. The guanylurea cation has frequently been reported to be a useful component in energetic nitrogen-rich salts, e.g. guanylurea dinitramide (Langlet, 1998) or guanylurea tetrazolate salts (Wang et al., 2009). An aqueous solution of sodium dipicrylamide was prepared in situ by deprotonating dipicrylamine with NaOH. Treatment of this dark-red solution with solid 1-carbamoylguanidinium sulfate, [H₂NC(=O)NHC(NH₂)₂]₂SO₄ (also known as guanylurea sulfate) (Lotsch & Schnick, 2005), afforded dark-red block-like crystals of the title compound after undisturbed standing of the reaction mixture for 10 d. The product was characterized by spectroscopic methods and elemental analysis. The ¹H NMR spectrum displayed a sharp singlet at δ = 8.78 p.p.m. for the aromatic protons of the DPA^- anion, which is in excellent agreement with the literature values (Eringathodi et al., 2005; Agnihotri et al., 2006; Huang et al., 2011). However, the NH and NH₂ protons only gave rise to two very broad resonances spread over a range of ca 4 p.p.m. (δ(C(O)NH₂) = ca 6.3–7.1 p.p.m., δ[NHC(NH₂)₂] = ca 3.3–5.8 p.p.m.). In contrast, interpretation of the ¹³C NMR spectrum was straightforward. In perfect agreement with the ¹³C NMR data of previously reported ammonium and azolium DPA salts (Huang et al., 2011), the spectrum of the title compound displayed signals of the aromatic ring carbons at δ = 143.4, 139.5, 132.6, and 125.1 p.p.m.. The two carbon resonances of the guanylurea cation were well separated at δ = 157.4 p.p.m. (C═O) and δ = 155.5 p.p.m. [NHC(NH₂)₂). IR bands in the range of 3200–3400 cm^-1 were characteristic for the N—H valence vibrations in the guanylurea cation. A strong carbonyl band was observed at 1632 cm^-1, whereas the band at 1532 cm^-1 is characteristic for the nitro groups.

Structural commentary top

Single crystals obtained directly from the reaction mixture were found to be suitable for X-ray diffraction. The title compound crystallizes in the triclinic space group P1. The crystal structure consists of mutually linked 1-carbamoylguanidinium cations and dipicrylamide anions (Fig. 1). The angle C1—N1—C7 at the amide nitrogen atom of the DPA^- anion is 131.66 (10)°, with C—N bond lengths of 1.3021 (15) (C1—N1) and 1.3403 (15) Å (C7—N1). These values are somewhat shorter than the C—N bond lengths in free dipicrylamine (1.373, 1.375 Å; Huang et al., 2011) but comparable to those reported for related azolium dipicrylamides which have central C—N bond lengths in the range of 1.281–1.338 Å (Huang et al., 2011). These values indicate delocalization of the nitrogen lone pair on N1 in dipicrylamide salts, thereby stabilizing the anion by strengthening the C1—N1 and C7—N1 bonds. As a structural consequence, not only is the central C1—N1—C7 angle widened, but there is also a significant elongation of the four C—C bonds adjacent to C1 and C7 (average 1.433 Å) as compared to the other aromatic C—C bonds (average 1.378 Å). The C—N bond lengths in the nearly planar (r.m.s. deviation = 0.00? Å) 1-carbamoylguanidinium cation also indicate significant electron delocalization. The geometry around the carbon atom in the amidinium fragment NHC(NH₂)₂ is nearly trigonal-planar with N—C—N angles between 117.52 (11) and 121.48 (11)° and C—N distances in the very narrow range of 1.3064 (15)–1.3158 (15) Å. Overall, the structural parameters of the cation in the title compound do not differ significantly from those in 1-carbamoylguanidinium sulfate, [H₂NC(=O)NHC(NH₂)₂]₂SO₄ (Lotsch & Schnick, 2005).

Supramolecular features top

Both the cation and the anion comprise numerous sites capable of forming different types of hydrogen bonds. Thus it is not surprising that the crystal packing (Fig. 2) is controlled by an extensive hydrogen-bonding network. Six distinct N—H···O hydrogen bonds are found in the crystal packing of the title compound. First of all, pairs of cations are formed through dimerization via two N—H···O hydrogen bonds between the ureic fragments, which is also very typical for carboxylic amides. Furthermore, the NH₂ groups in the amidinium fragments NHC(NH₂)₂ engage in four N—H···O hydrogen bonds to three different nitro groups of the DPA^- anion. The calculated density of 1.795 Mg m^-3 is not only higher than the densities reported for other DPA-based salts (1.69–1.78 Mg m^-3), but also much higher than the density of TNT (1.65 Mg m^-3) (Huang et al., 2011). The high density of the title compound can be traced back in large part to the hydrogen bonding in the crystal structure. The energetic properties (e.g. impact and friction sensitivity) of guanylurea dipicrylamide have not been tested, but recent findings have shown that the impact sensitivities of various ammonium and azolium dipicrylamides are in the range of that of the secondary explosive TNT (Huang et al., 2011).

Synthesis and crystallization top

Cautionary note: Dipicrylamine and dipicrylamide salts are potentially explosive and should be handled only in small amounts using proper safety equipment (Klapötke, 2011).

Preparation of guanylurea dipicrylamide: To a suspension of dipicrylamine (1.0 g, 2.3 mmol) in 10 ml water were added two pellets of NaOH to give a dark red solution of sodium dipicrylamide; 0.23 g (mmol) of guanylurea sulfate were added as solid, and the mixture was allowed to stand undisturbed at room temperature. After 10 d, 0.87 g (70%) dark-red crystals of the title compound had formed, which were isolated by filtration and dried in air. Analysis calculated for C₁₄H₁₁N₁₁O₁₃ (541.3 g/mol): C 31.06, H 2.05, N, 28.46; found: C 31.87, H 2.27, N 28.10%. IR (KBr pellet): ν_max 3403 (vs), 2171 (w), 1632 (vs), 1532 (s), 1402 (vs), 1270 (s), 1129 (m), 924 (w), 878 (m), 840 (w), 773 (w), 701 (m), 622 (m), 452 (m). ¹H NMR (600 MHz, acetone-d₆, 298 K): δ = 8.78 (s, 4 H, C₆H₂(NO₂)₃), ca 6.3–7.1 [vbr, 2 H, C(O)NH₂], ca 3.3–5.8 [vbr, 5 H, NHC(NH₂)₂] p.p.m. ¹³C NMR (150.9 MHz, acetone-d₆, 298 K): δ = 157.4 (C=O); 155.5 [NHC(NH₂)₂]; 143.4, 139.5, 132.6, 125.1 [C₆H₂(NO₂)₃] p.p.m.

Refinement top

Crystal data, data collection and structure refinement details are summarized in Table 3. Positions and isotropic thermal parameters of hydrogen atoms were freely refined.

Related literature top

For reviews on high-energy-density materials, see: Oestmark et al. (2007); Rice et al. (2007); Badgujar et al. (2008); Göbel & Klapötke (2009); Nair et al. (2010); Klapötke (2011). For general information on dipicrylamine, see: Gnehm (1874); Gnehm (1876); Winkel & Maas (1936); Kyrš et al. (1960); Bray et al. (1962). For related structures of dipicrylamide salts, see: Eringathodi et al. (2005); Agnihotri et al. (2006); Huang et al. (2011). For related guanylurea salts, see: Langlet (1998); Lotsch & Schnick (2005); Wang et al. (2009).

Computing details top

Data collection: X-AREA (Stoe & Cie, 2002); cell refinement: X-AREA (Stoe & Cie, 2002); data reduction: X-RED (Stoe & Cie, 2002); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: XP in SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top

	Fig. 1. Molecular structure of the title compound. Displacement ellipsoids represent 50% probability levels.
	Fig. 2. A packing diagram of the title compound. Dashed lines indicate N—H···O hydrogen-bonding interactions.

1-Carbamoylguanidinium bis(2,4,6-trinitrophenyl)azanide top

Crystal data top

C₂H₇N₄O⁺·C₁₂H₄N₇O₁₂⁻	Z = 2
M_r = 541.34	F(000) = 552
Triclinic, P1	D_x = 1.795 Mg m⁻³
a = 7.9764 (16) Å	Mo Kα radiation, λ = 0.71073 Å
b = 8.6658 (17) Å	Cell parameters from 15866 reflections
c = 15.278 (3) Å	θ = 2.4–29.6°
α = 87.79 (3)°	µ = 0.16 mm⁻¹
β = 76.18 (3)°	T = 173 K
γ = 77.59 (3)°	Platelet, red
V = 1001.4 (3) Å³	0.40 × 0.20 × 0.10 × 0.40 (radius) mm

Data collection top

Stoe IPDS 2T diffractometer	5347 independent reflections
Radiation source: fine-focus sealed tube	4600 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.029
Detector resolution: 6.67 pixels mm^-1	θ_max = 29.2°, θ_min = 2.4°
rotation method scans	h = −10→10
Absorption correction: for a sphere [the interpolation procedure of Dwiggins (1975) is used with some modification]	k = −11→10
T_min = 0.861, T_max = 0.862	l = −20→20
12316 measured reflections

Refinement top

Refinement on F²	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F² > 2σ(F²)] = 0.037	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.097	All H-atom parameters refined
S = 1.02	w = 1/[σ²(F_o²) + (0.0535P)² + 0.3153P] where P = (F_o² + 2F_c²)/3
5347 reflections	(Δ/σ)_max < 0.001
387 parameters	Δρ_max = 0.38 e Å⁻³
0 restraints	Δρ_min = −0.24 e Å⁻³

Crystal data top

C₂H₇N₄O⁺·C₁₂H₄N₇O₁₂⁻	γ = 77.59 (3)°
M_r = 541.34	V = 1001.4 (3) Å³
Triclinic, P1	Z = 2
a = 7.9764 (16) Å	Mo Kα radiation
b = 8.6658 (17) Å	µ = 0.16 mm⁻¹
c = 15.278 (3) Å	T = 173 K
α = 87.79 (3)°	0.40 × 0.20 × 0.10 × 0.40 (radius) mm
β = 76.18 (3)°

Data collection top

Stoe IPDS 2T diffractometer	5347 independent reflections
Absorption correction: for a sphere [the interpolation procedure of Dwiggins (1975) is used with some modification]	4600 reflections with I > 2σ(I)
T_min = 0.861, T_max = 0.862	R_int = 0.029
12316 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.037	0 restraints
wR(F²) = 0.097	All H-atom parameters refined
S = 1.02	Δρ_max = 0.38 e Å⁻³
5347 reflections	Δρ_min = −0.24 e Å⁻³
387 parameters

Special details top

Experimental. Absorption correction: interpolation using Int.Tab. Vol. C (1992) p. 523,Tab. 6.3.3.3 for values of muR in the range 0-2.5, and Int.Tab. Vol.II (1959) p.302; Table 5.3.6 B for muR in the range 2.6-10.0. The interpolation procedure of C.W.Dwiggins Jr (Acta Cryst.(1975) A31,146-148) is used with some modification.

Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.

Refinement. Refinement of F² against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F², conventional R-factors R are based on F, with F set to zero for negative F². The threshold expression of F² > σ(F²) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F² are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
C1	0.13227 (14)	0.24457 (12)	0.39236 (7)	0.0151 (2)
C2	−0.03965 (14)	0.21716 (13)	0.43593 (7)	0.0158 (2)
C3	−0.11338 (14)	0.23130 (13)	0.52583 (8)	0.0171 (2)
C4	−0.02176 (15)	0.28759 (13)	0.58079 (7)	0.0179 (2)
C5	0.13785 (15)	0.33132 (13)	0.54440 (8)	0.0178 (2)
C6	0.20813 (14)	0.31551 (13)	0.45315 (8)	0.0162 (2)
C7	0.36230 (14)	0.18019 (13)	0.25658 (7)	0.0155 (2)
C8	0.39833 (14)	0.26546 (13)	0.17498 (7)	0.0163 (2)
C9	0.56417 (15)	0.25536 (13)	0.11987 (7)	0.0172 (2)
C10	0.70261 (14)	0.14633 (13)	0.14019 (7)	0.0173 (2)
C11	0.67718 (15)	0.04590 (13)	0.21192 (8)	0.0171 (2)
C12	0.51165 (15)	0.06495 (13)	0.26863 (7)	0.0158 (2)
C13	0.52565 (15)	0.81485 (13)	0.08734 (8)	0.0179 (2)
C14	0.71331 (15)	0.61455 (13)	0.16006 (8)	0.0172 (2)
N1	0.19803 (13)	0.19905 (13)	0.30867 (7)	0.0200 (2)
N2	−0.13796 (12)	0.16126 (11)	0.37884 (6)	0.01692 (18)
N3	−0.09042 (14)	0.29484 (14)	0.67591 (7)	0.0238 (2)
N4	0.37044 (13)	0.37051 (12)	0.41873 (7)	0.0205 (2)
N5	0.25570 (14)	0.37578 (12)	0.14648 (7)	0.0213 (2)
N6	0.88031 (14)	0.14007 (13)	0.08619 (7)	0.0234 (2)
N7	0.49658 (13)	−0.04504 (12)	0.34353 (7)	0.01838 (19)
N8	0.35796 (15)	0.88985 (15)	0.09821 (8)	0.0259 (2)
N9	0.55299 (13)	0.69662 (12)	0.15042 (7)	0.01906 (19)
N10	0.85939 (14)	0.63735 (14)	0.10593 (8)	0.0261 (2)
N11	0.71516 (15)	0.51081 (12)	0.22520 (7)	0.0215 (2)
O1	−0.16781 (14)	0.24229 (13)	0.31524 (7)	0.0337 (2)
O2	−0.18842 (15)	0.03875 (12)	0.39857 (7)	0.0314 (2)
O3	−0.22256 (13)	0.23815 (13)	0.70773 (6)	0.0304 (2)
O4	−0.01651 (15)	0.35404 (17)	0.72337 (7)	0.0422 (3)
O5	0.47838 (14)	0.35606 (16)	0.46451 (8)	0.0397 (3)
O6	0.38899 (13)	0.43379 (11)	0.34384 (6)	0.0274 (2)
O7	0.10972 (12)	0.34437 (13)	0.16262 (7)	0.0317 (2)
O8	0.29112 (15)	0.49270 (13)	0.10475 (8)	0.0367 (2)
O9	0.90145 (13)	0.24434 (14)	0.03099 (7)	0.0352 (2)
O10	0.99853 (12)	0.03311 (14)	0.09936 (8)	0.0354 (2)
O11	0.58711 (14)	−0.17887 (11)	0.32959 (7)	0.0294 (2)
O12	0.39664 (14)	0.00059 (12)	0.41533 (6)	0.0307 (2)
O13	0.64763 (12)	0.84315 (11)	0.02764 (6)	0.02486 (19)
H3	−0.223 (2)	0.207 (2)	0.5474 (11)	0.025 (4)*
H5	0.199 (2)	0.369 (2)	0.5811 (11)	0.024 (4)*
H8A	0.333 (3)	0.968 (2)	0.0628 (13)	0.037 (5)*
H8B	0.277 (3)	0.865 (2)	0.1401 (13)	0.033 (5)*
H9	0.583 (2)	0.321 (2)	0.0692 (11)	0.025 (4)*
H9A	0.465 (3)	0.679 (2)	0.1898 (12)	0.031 (4)*
H10A	0.852 (3)	0.705 (2)	0.0631 (13)	0.038 (5)*
H10B	0.958 (3)	0.589 (3)	0.1157 (14)	0.046 (5)*
H11	0.768 (2)	−0.030 (2)	0.2250 (11)	0.027 (4)*
H11A	0.814 (3)	0.462 (2)	0.2352 (12)	0.031 (4)*
H11B	0.621 (3)	0.502 (2)	0.2631 (13)	0.034 (5)*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0106 (5)	0.0169 (5)	0.0157 (5)	−0.0022 (4)	−0.0004 (4)	0.0022 (4)
C2	0.0119 (5)	0.0176 (5)	0.0176 (5)	−0.0037 (4)	−0.0027 (4)	0.0021 (4)
C3	0.0119 (5)	0.0191 (5)	0.0183 (5)	−0.0038 (4)	0.0000 (4)	0.0035 (4)
C4	0.0150 (5)	0.0215 (5)	0.0140 (5)	−0.0025 (4)	0.0013 (4)	0.0006 (4)
C5	0.0156 (5)	0.0189 (5)	0.0177 (5)	−0.0028 (4)	−0.0020 (4)	−0.0014 (4)
C6	0.0107 (4)	0.0180 (5)	0.0183 (5)	−0.0035 (4)	0.0004 (4)	0.0004 (4)
C7	0.0127 (5)	0.0192 (5)	0.0142 (5)	−0.0038 (4)	−0.0015 (4)	−0.0015 (4)
C8	0.0135 (5)	0.0187 (5)	0.0148 (5)	0.0004 (4)	−0.0027 (4)	−0.0009 (4)
C9	0.0165 (5)	0.0200 (5)	0.0138 (5)	−0.0037 (4)	−0.0012 (4)	0.0000 (4)
C10	0.0119 (5)	0.0221 (5)	0.0157 (5)	−0.0032 (4)	0.0009 (4)	−0.0018 (4)
C11	0.0132 (5)	0.0193 (5)	0.0179 (5)	−0.0013 (4)	−0.0036 (4)	−0.0011 (4)
C12	0.0156 (5)	0.0175 (5)	0.0144 (5)	−0.0043 (4)	−0.0032 (4)	0.0016 (4)
C13	0.0162 (5)	0.0205 (5)	0.0161 (5)	−0.0013 (4)	−0.0045 (4)	0.0004 (4)
C14	0.0141 (5)	0.0177 (5)	0.0186 (5)	−0.0025 (4)	−0.0024 (4)	0.0017 (4)
N1	0.0121 (4)	0.0303 (5)	0.0162 (4)	−0.0043 (4)	−0.0006 (3)	−0.0014 (4)
N2	0.0126 (4)	0.0196 (4)	0.0179 (4)	−0.0037 (3)	−0.0025 (3)	0.0027 (3)
N3	0.0185 (5)	0.0332 (5)	0.0160 (5)	−0.0033 (4)	0.0013 (4)	−0.0005 (4)
N4	0.0147 (4)	0.0227 (5)	0.0229 (5)	−0.0072 (4)	0.0018 (4)	−0.0041 (4)
N5	0.0184 (5)	0.0226 (5)	0.0190 (5)	0.0031 (4)	−0.0038 (4)	0.0003 (4)
N6	0.0138 (5)	0.0314 (5)	0.0214 (5)	−0.0033 (4)	0.0016 (4)	−0.0001 (4)
N7	0.0176 (5)	0.0184 (4)	0.0191 (4)	−0.0044 (3)	−0.0039 (4)	0.0028 (3)
N8	0.0152 (5)	0.0320 (6)	0.0261 (5)	0.0018 (4)	−0.0037 (4)	0.0071 (4)
N9	0.0110 (4)	0.0246 (5)	0.0190 (5)	−0.0024 (4)	−0.0006 (4)	0.0052 (4)
N10	0.0120 (5)	0.0321 (6)	0.0286 (5)	−0.0002 (4)	−0.0002 (4)	0.0146 (4)
N11	0.0164 (5)	0.0220 (5)	0.0238 (5)	−0.0031 (4)	−0.0025 (4)	0.0086 (4)
O1	0.0378 (6)	0.0385 (5)	0.0367 (5)	−0.0192 (4)	−0.0248 (5)	0.0205 (4)
O2	0.0435 (6)	0.0256 (5)	0.0346 (5)	−0.0194 (4)	−0.0177 (5)	0.0086 (4)
O3	0.0249 (5)	0.0429 (6)	0.0193 (4)	−0.0115 (4)	0.0059 (4)	0.0034 (4)
O4	0.0331 (6)	0.0761 (9)	0.0199 (5)	−0.0200 (6)	−0.0015 (4)	−0.0126 (5)
O5	0.0232 (5)	0.0655 (8)	0.0370 (6)	−0.0218 (5)	−0.0092 (4)	0.0016 (5)
O6	0.0252 (5)	0.0296 (5)	0.0252 (4)	−0.0133 (4)	0.0044 (4)	0.0024 (4)
O7	0.0154 (4)	0.0409 (5)	0.0363 (5)	0.0005 (4)	−0.0075 (4)	0.0043 (4)
O8	0.0336 (5)	0.0282 (5)	0.0433 (6)	0.0004 (4)	−0.0078 (5)	0.0145 (4)
O9	0.0218 (5)	0.0443 (6)	0.0327 (5)	−0.0087 (4)	0.0060 (4)	0.0125 (4)
O10	0.0134 (4)	0.0450 (6)	0.0387 (6)	0.0043 (4)	0.0011 (4)	0.0058 (5)
O11	0.0363 (5)	0.0191 (4)	0.0281 (5)	0.0028 (4)	−0.0070 (4)	0.0027 (3)
O12	0.0329 (5)	0.0293 (5)	0.0202 (4)	0.0006 (4)	0.0050 (4)	0.0062 (4)
O13	0.0184 (4)	0.0303 (5)	0.0208 (4)	−0.0003 (3)	−0.0007 (3)	0.0089 (3)

Geometric parameters (Å, º) top

C1—N1	1.3021 (15)	C13—N8	1.3295 (16)
C1—C2	1.4394 (15)	C13—N9	1.3980 (15)
C1—C6	1.4419 (16)	C14—N10	1.3064 (16)
C2—C3	1.3577 (16)	C14—N11	1.3158 (15)
C2—N2	1.4605 (15)	C14—N9	1.3615 (15)
C3—C4	1.3981 (17)	N2—O1	1.2167 (13)
C3—H3	0.924 (18)	N2—O2	1.2169 (14)
C4—C5	1.3880 (16)	N3—O4	1.2245 (16)
C4—N3	1.4241 (15)	N3—O3	1.2441 (15)
C5—C6	1.3728 (16)	N4—O5	1.2170 (15)
C5—H5	0.933 (17)	N4—O6	1.2398 (14)
C6—N4	1.4493 (15)	N5—O7	1.2184 (15)
C7—N1	1.3403 (15)	N5—O8	1.2248 (15)
C7—C12	1.4247 (16)	N6—O10	1.2205 (15)
C7—C8	1.4256 (16)	N6—O9	1.2228 (15)
C8—C9	1.3748 (16)	N7—O12	1.2146 (14)
C8—N5	1.4612 (15)	N7—O11	1.2237 (14)
C9—C10	1.3789 (16)	N8—H8A	0.87 (2)
C9—H9	0.943 (17)	N8—H8B	0.85 (2)
C10—C11	1.3770 (16)	N9—H9A	0.845 (19)
C10—N6	1.4506 (15)	N10—H10A	0.86 (2)
C11—C12	1.3755 (16)	N10—H10B	0.85 (2)
C11—H11	0.926 (17)	N11—H11A	0.859 (19)
C12—N7	1.4602 (15)	N11—H11B	0.85 (2)
C13—O13	1.2248 (15)

N1—C1—C2	118.13 (10)	O13—C13—N9	121.68 (11)
N1—C1—C6	130.03 (10)	N8—C13—N9	113.95 (11)
C2—C1—C6	111.79 (10)	N10—C14—N11	121.48 (11)
C3—C2—C1	125.42 (10)	N10—C14—N9	121.00 (11)
C3—C2—N2	117.65 (10)	N11—C14—N9	117.52 (11)
C1—C2—N2	116.84 (10)	C1—N1—C7	131.66 (10)
C2—C3—C4	118.04 (10)	O1—N2—O2	123.85 (10)
C2—C3—H3	118.7 (10)	O1—N2—C2	117.73 (10)
C4—C3—H3	123.2 (10)	O2—N2—C2	118.40 (10)
C5—C4—C3	121.07 (10)	O4—N3—O3	122.46 (11)
C5—C4—N3	119.53 (11)	O4—N3—C4	119.22 (11)
C3—C4—N3	119.37 (10)	O3—N3—C4	118.32 (11)
C6—C5—C4	119.18 (11)	O5—N4—O6	123.58 (11)
C6—C5—H5	119.8 (10)	O5—N4—C6	119.33 (11)
C4—C5—H5	121.0 (10)	O6—N4—C6	117.07 (10)
C5—C6—C1	123.71 (10)	O7—N5—O8	123.41 (11)
C5—C6—N4	116.52 (10)	O7—N5—C8	118.60 (10)
C1—C6—N4	119.74 (10)	O8—N5—C8	117.94 (11)
N1—C7—C12	125.74 (10)	O10—N6—O9	124.42 (11)
N1—C7—C8	121.07 (10)	O10—N6—C10	118.28 (11)
C12—C7—C8	112.79 (10)	O9—N6—C10	117.29 (11)
C9—C8—C7	124.08 (10)	O12—N7—O11	123.96 (11)
C9—C8—N5	115.57 (10)	O12—N7—C12	118.82 (10)
C7—C8—N5	120.32 (10)	O11—N7—C12	117.22 (10)
C8—C9—C10	118.29 (11)	C13—N8—H8A	118.3 (13)
C8—C9—H9	121.0 (10)	C13—N8—H8B	121.2 (13)
C10—C9—H9	120.7 (10)	H8A—N8—H8B	120.4 (18)
C11—C10—C9	121.68 (11)	C14—N9—C13	125.47 (10)
C11—C10—N6	119.08 (10)	C14—N9—H9A	115.3 (12)
C9—C10—N6	119.23 (11)	C13—N9—H9A	118.9 (12)
C12—C11—C10	118.50 (10)	C14—N10—H10A	118.5 (13)
C12—C11—H11	119.0 (11)	C14—N10—H10B	119.0 (14)
C10—C11—H11	122.4 (11)	H10A—N10—H10B	122.4 (19)
C11—C12—C7	124.02 (10)	C14—N11—H11A	119.4 (12)
C11—C12—N7	115.00 (10)	C14—N11—H11B	121.4 (13)
C7—C12—N7	120.98 (10)	H11A—N11—H11B	118.3 (18)
O13—C13—N8	124.37 (11)

N1—C1—C2—C3	167.76 (11)	C2—C1—N1—C7	−165.33 (12)
C6—C1—C2—C3	−9.85 (15)	C6—C1—N1—C7	11.8 (2)
N1—C1—C2—N2	−8.72 (15)	C12—C7—N1—C1	66.71 (19)
C6—C1—C2—N2	173.68 (9)	C8—C7—N1—C1	−121.14 (14)
C1—C2—C3—C4	4.74 (17)	C3—C2—N2—O1	125.71 (12)
N2—C2—C3—C4	−178.81 (10)	C1—C2—N2—O1	−57.53 (14)
C2—C3—C4—C5	1.49 (17)	C3—C2—N2—O2	−52.73 (15)
C2—C3—C4—N3	−176.28 (10)	C1—C2—N2—O2	124.03 (12)
C3—C4—C5—C6	−1.44 (17)	C5—C4—N3—O4	7.09 (18)
N3—C4—C5—C6	176.32 (10)	C3—C4—N3—O4	−175.11 (12)
C4—C5—C6—C1	−4.75 (17)	C5—C4—N3—O3	−171.84 (11)
C4—C5—C6—N4	177.02 (10)	C3—C4—N3—O3	5.96 (17)
N1—C1—C6—C5	−167.52 (12)	C5—C6—N4—O5	34.71 (16)
C2—C1—C6—C5	9.72 (15)	C1—C6—N4—O5	−143.59 (12)
N1—C1—C6—N4	10.66 (18)	C5—C6—N4—O6	−143.68 (11)
C2—C1—C6—N4	−172.10 (9)	C1—C6—N4—O6	38.02 (15)
N1—C7—C8—C9	177.97 (11)	C9—C8—N5—O7	147.05 (12)
C12—C7—C8—C9	−8.94 (16)	C7—C8—N5—O7	−34.82 (16)
N1—C7—C8—N5	0.00 (16)	C9—C8—N5—O8	−30.50 (16)
C12—C7—C8—N5	173.10 (10)	C7—C8—N5—O8	147.63 (12)
C7—C8—C9—C10	5.82 (17)	C11—C10—N6—O10	8.75 (17)
N5—C8—C9—C10	−176.13 (10)	C9—C10—N6—O10	−172.92 (12)
C8—C9—C10—C11	1.94 (17)	C11—C10—N6—O9	−170.40 (12)
C8—C9—C10—N6	−176.35 (10)	C9—C10—N6—O9	7.93 (17)
C9—C10—C11—C12	−5.54 (17)	C11—C12—N7—O12	145.75 (11)
N6—C10—C11—C12	172.75 (10)	C7—C12—N7—O12	−35.22 (16)
C10—C11—C12—C7	1.73 (17)	C11—C12—N7—O11	−34.09 (15)
C10—C11—C12—N7	−179.28 (10)	C7—C12—N7—O11	144.94 (11)
N1—C7—C12—C11	177.77 (11)	N10—C14—N9—C13	−2.99 (19)
C8—C7—C12—C11	5.06 (16)	N11—C14—N9—C13	177.65 (11)
N1—C7—C12—N7	−1.17 (17)	O13—C13—N9—C14	8.07 (19)
C8—C7—C12—N7	−173.87 (10)	N8—C13—N9—C14	−172.57 (12)

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N8—H8A···O13ⁱ	0.87 (2)	2.11 (2)	2.9507 (17)	163.1 (18)
N8—H8B···O3ⁱⁱ	0.85 (2)	2.434 (19)	3.1495 (18)	142.4 (16)
N10—H10A···O13	0.86 (2)	1.98 (2)	2.6403 (16)	132.2 (17)
N10—H10A···O9ⁱⁱⁱ	0.86 (2)	2.26 (2)	2.7991 (17)	120.7 (16)
N11—H11A···O1^iv	0.859 (19)	2.222 (18)	2.7590 (16)	120.5 (15)
N11—H11B···O6	0.85 (2)	2.15 (2)	2.9833 (17)	167.7 (18)

Symmetry codes: (i) −x+1, −y+2, −z; (ii) −x, −y+1, −z+1; (iii) −x+2, −y+1, −z; (iv) x+1, y, z.

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
N8—H8A···O13ⁱ	0.87 (2)	2.11 (2)	2.9507 (17)	163.1 (18)
N8—H8B···O3ⁱⁱ	0.85 (2)	2.434 (19)	3.1495 (18)	142.4 (16)
N10—H10A···O13	0.86 (2)	1.98 (2)	2.6403 (16)	132.2 (17)
N10—H10A···O9ⁱⁱⁱ	0.86 (2)	2.26 (2)	2.7991 (17)	120.7 (16)
N11—H11A···O1^iv	0.859 (19)	2.222 (18)	2.7590 (16)	120.5 (15)
N11—H11B···O6	0.85 (2)	2.15 (2)	2.9833 (17)	167.7 (18)

Symmetry codes: (i) −x+1, −y+2, −z; (ii) −x, −y+1, −z+1; (iii) −x+2, −y+1, −z; (iv) x+1, y, z.

Experimental details

Crystal data
Chemical formula	C₂H₇N₄O⁺·C₁₂H₄N₇O₁₂⁻
M_r	541.34
Crystal system, space group	Triclinic, P1
Temperature (K)	173
a, b, c (Å)	7.9764 (16), 8.6658 (17), 15.278 (3)
α, β, γ (°)	87.79 (3), 76.18 (3), 77.59 (3)
V (Å³)	1001.4 (3)
Z	2
Radiation type	Mo Kα
µ (mm⁻¹)	0.16
Crystal size (mm)	0.40 × 0.20 × 0.10 × 0.40 (radius)

Data collection
Diffractometer	Stoe IPDS 2T diffractometer
Absorption correction	For a sphere [the interpolation procedure of Dwiggins (1975) is used with some modification]
T_min, T_max	0.861, 0.862
No. of measured, independent and observed [I > 2σ(I)] reflections	12316, 5347, 4600
R_int	0.029
(sin θ/λ)_max (Å⁻¹)	0.685

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.037, 0.097, 1.02
No. of reflections	5347
No. of parameters	387
H-atom treatment	All H-atom parameters refined
Δρ_max, Δρ_min (e Å⁻³)	0.38, −0.24

Computer programs: X-AREA (Stoe & Cie, 2002), X-RED (Stoe & Cie, 2002), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), XP in SHELXTL (Sheldrick, 2008).

Acknowledgements

Financial support of this work by the Otto-von-Guericke-Universität Magdeburg is gratefully acknowledged.

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Volume 70| Part 8| August 2014| Pages 111-114

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