research communications
of 1,4-bis(3-ammoniopropyl)piperazine-1,4-diium bis[dichromate(VI)]
aPG & Research Department of Physics, Government Arts College, Tiruvannamalai 606 603, Tamil Nadu, India, and bDepartment of Physics, The New College (Autonomous), Chennai 600 014, Tamil Nadu, India
*Correspondence e-mail: mnizam_new@yahoo.in
The 10H28N4)[Cr2O7]2, comprises one half of an 1,4-bis(3-ammoniopropyl)piperazinediium cation (the other half being generated by the application of inversion symmetry) and a dichromate anion. The piperazine ring of the cation adopts a chair conformation, and the two CrO4 tetrahedra of the anion are in an almost eclipsed conformation. In the crystal, the cations and anions form a layered arrangement parallel to (001). N—H⋯O hydrogen bonds between the cations and anions and additional C—H⋯O interactions lead to the formation of a three-dimensional network structure.
of the organic–inorganic title salt, (CKeywords: crystal structure; dichromate anion; piperazinediium cation; molecular salt; hydrogen bonding..
CCDC reference: 1471068
1. Chemical context
Chromium is usually found in trivalent and hexavalent oxidation states in soil, ground water and seawater (Cespón-Romero et al., 1996). Trivalent chromium is an essential element in mammals for maintaining efficient glucose, lipid and protein metabolism. On the other hand, hexavalent chromium is toxic and recognized as a carcinogen to humans and wildlife. Hence the dichromate ion is environmentally important due to its high toxicity (Yusof & Malek, 2009) and its use in many industrial processes (Goyal et al., 2003). Recently, the reactions between hexaureachromium(III) and inorganic oxoanions (such as Cr2O72− or CrO42−) in aqueous solution have been investigated (Moon et al., 2015). Numerous piperazine derivatives have shown a wide spectrum of biological activities, viz. antibacterial (Foroumadi et al., 2007), antifungal (Upadhayaya et al., 2004), anticancer (Chen et al., 2006), antiparasitic (Cunico et al., 2009), antihistamine (Smits et al., 2008) or antidepressive activities (Becker et al., 2006). Antidiabetic, anti-inflammatory, antitubercular, antimalarial, anticonvulsant, antipyretic, antitumor, anthelmintic and analgesic activities (Gan et al., 2009a,b; Willems & Ilzerman, 2010) have also been found to be caused by this versatile moiety. In view of these important properties, we have undertaken the synthesis and X-ray diffraction study of the title compound.
2. Structural commentary
The molecular entities of the title compound, consisting of a centrosymmetric 1,4-bis(3-ammoniopropyl)piperazinediium cation and a dichromate anion, are shown in Fig. 1. In the cation, the central piperazine ring (N1/C1/C2/N1i/C1i/C2i; for symmetry operators, see Fig. 1) is substituted at the two N atoms by two ammoniopropyl moieties. The piperazine ring adopts a chair conformation, as is evident from the puckering parameters: Q = 0.599 (2) Å, τ = 180.0° and φ = 0°. Atoms N1 and N1i are on opposite sides of the C1/C1i/C2/C2i plane and are both displaced from it by 0.2446 (19) Å. The chair conformation of the cation in the title structure is very similar to those of the same cation in the crystal structures of the 2-hydroxybenzoate (Cukrowski et al., 2012), the nitrate (Junk & Smith, 2005) and the tetrahydrogenpentaborate (Jiang et al., 2009) salts, despite the differences in the size and shape of the anions in the various structures. The tetrahedral CrO4 groups in the anion of the title structure are fused together by a common O atom (O8) and are in an almost eclipsed conformation (Brandon & Brown, 1968). The Cr—O bond lengths follow the characteristic distribution for dichromate anions, with two longer bridging Cr—O bonds of 1.7676 (16) and 1.7746 (15) Å and six shorter terminal Cr—O bonds [range 1.5909 (19)–1.6185 (15) Å]. The Cr1—O8—Cr2 bridging angle in the complex anion is 127.48 (10)°. The tetrahedral O—Cr—O bond angles [range 106.52 (8) to 112.85 (12)°] indicate slight angular distortions.
3. Supramolecular features
The organic cations and inorganic anions are each arranged in rows parallel to [100] and alternate with each other along [010], forming a layered arrangement parallel to (001). N—H⋯O hydrogen bonds (Table 1) between the cations, involving both primary and tertiary ammonium groups, and the anions lead to a three-dimensional network structure (Figs. 2 and 3). Additional C—H⋯O interactions consolidate this arrangement.
4. Synthesis and crystallization
Potassium dichromate and 1,4-bis(3-aminopropyl)piperazine (PDBP) were mixed in a molar ratio of 2:1 in water. Potassium dichromate was first dissolved in Millipore water of 18.2 MΩ·cm resistivity. Then the amount of PDBP was slowly added to the solution together with a few drops of concentrated hydrochloric acid and the mixture stirred for 18 h. The solution was then filtered twice with Wattmann filter paper and poured into petri dishes to evaporate at room temperature for several days. Recrystallization from water improved the quality of the material and increased the size of the crystals (maximum crystal size 5×3×2 mm3 after 35 d). A specimen was cleaved for the present structure determination.
5. Refinement
Crystal data, data collection and structure . All hydrogen atoms were placed geometrically and refined using a riding model: N—H = 0.89 Å for the primary ammonium group with Uiso(H) = 1.5Ueq(N); N—H = 0.98 Å for the tertiary ammonium group with Uiso(H) = 1.2Ueq(N); C—H = 0.97 Å with Uiso(H) = 1.2Ueq(C).
details are summarized in Table 2
|
Supporting information
CCDC reference: 1471068
10.1107/S2056989016005284/wm5281sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989016005284/wm5281Isup2.hkl
Chromium is usually found in trivalent and hexavalent oxidation states in soil, ground water and seawater (Cespon-Romero et al., 1996). Trivalent chromium is an essential element in mammals for maintaining efficient glucose, lipid and protein metabolism. On the other hand, hexavalent chromium is toxic and recognized as a carcinogen to humans and wildlife. Hence the dichromate ion is environmentally important due to its high toxicity (Yusof & Malek, 2009) and its use in many industrial processes (Goyal et al., 2003). Recently, the reactions between hexaureachromium(III) and inorganic oxoanions (such as Cr2O72- or CrO42-) in aqueous solution have been investigated (Moon et al., 2015). Numerous piperazine derivatives have shown a wide spectrum of biological activities, viz. antibacterial (Foroumadi et al., 2007), antifungal (Upadhayaya et al., 2004), anticancer (Chen et al., 2006), antiparasitic (Cunico et al., 2009), antihistamine (Smits et al., 2008) or antidepressive activities (Becker et al., 2006). Antidiabetic, anti-inflammatory, antitubercular, antimalarial, anticonvulsant, antipyretic, antitumor, anthelmintic and analgesic activities (Gan et al., 2009a,b; Willems & Ilzerman, 2010) have also been found to be caused by this versatile moiety. In view of these important properties, we have undertaken the synthesis and X-ray diffraction study of the title compound.
The molecular entities of the title compound, consisting of a centrosymmetric 1,4-bis(3-ammoniopropyl)piperazinediium cation and a dichromate anion, are shown in Fig. 1. In the cation, the central piperazine ring (N1/C1/C2/N1i/C1i/C2i; for symmetry operators, see Fig. 1) is substituted at the two N atoms by two ammoniopropyl moieties. The piperazine ring adopts a chair conformation, as is evident from the puckering parameters: Q = 0.599 (2) Å, τ = 180.0° and φ = 0°. Atoms N1 and N1i are on opposite sides of the C1/C1i/C2/C2i plane and are both displaced from it by 0.2446 (19) Å. The chair conformation of the cation in the title structure is very similar to those of the same cation in the crystal structures of the 2-hydroxybenzoate (Cukrowski et al., 2012), the nitrate (Junk & Smith, 2005) and the tetrahydrogenpentaborate (Jiang et al., 2009) salts, despite the differences in the size and shape of the anions in the various structures. The tetrahedral CrO4 groups in the anion of the title structure are fused together by a common O atom (O8) and are in an almost eclipsed conformation (Brandon & Brown, 1968). The Cr—O bond length follow the characteristic distribution for dichromate anions, with two longer bridging Cr—O bonds of 1.7676 (16) and 1.7746 (15) Å and six shorter terminal Cr—O bonds [range 1.5909 (19)–1.6185 (15) Å]. The Cr1—O8—Cr2 bridging angle in the complex anion is 127.48 (10)°. The tetrahedral O—Cr—O bond angles [range 106.52 (8) to 112.85 (12)°] indicate slight angular distortions.
The organic cations and inorganic anions are each arranged in rows parallel to [100] and alternate with each other along [010], forming a layered arrangement parallel to (001). N—H···O hydrogen bonds (Table 1) between the cations, involving both primary and tertiary ammonium groups, and the anions lead to a three-dimensional network structure (Figs. 2 and 3). Additional C—H···O interactions consolidate this arrangement.
Potassium dichromate and 1,4-bis(3-aminopropyl)piperazine (PDBP) were mixed in a molar ratio of 2:1 in water. Potassium dichromate was first dissolved in Millipore water of 18.2 MΩ·cm resistivity. Then the amount of PDBP was slowly added to the solution together with a few drops of concentrated hydrochloric acid and the mixture stirred for 18 h. The solution was then filtered twice with Wattmann filter paper and poured into petri dishes to evaporate at room temperature for several days. Recrystallization from water improved the quality of the material and increased the size of the crystals (maximum crystal size 5×3×2 mm3 after 35 d). A specimen was cleaved for the present structure determination.
Crystal data, data collection and structure
details are summarized in Table 2. All hydrogen atoms were placed geometrically and refined using a riding model: N—H = 0.89 Å for the primary ammonium group with Uiso(H) = 1.5Ueq(N); N—H = 0.98 Å for the tertiary ammonium group with Uiso(H) = 1.2Ueq(N); C—H = 0.97 Å with Uiso(H) = 1.2Ueq(C).Chromium is usually found in trivalent and hexavalent oxidation states in soil, ground water and seawater (Cespon-Romero et al., 1996). Trivalent chromium is an essential element in mammals for maintaining efficient glucose, lipid and protein metabolism. On the other hand, hexavalent chromium is toxic and recognized as a carcinogen to humans and wildlife. Hence the dichromate ion is environmentally important due to its high toxicity (Yusof & Malek, 2009) and its use in many industrial processes (Goyal et al., 2003). Recently, the reactions between hexaureachromium(III) and inorganic oxoanions (such as Cr2O72- or CrO42-) in aqueous solution have been investigated (Moon et al., 2015). Numerous piperazine derivatives have shown a wide spectrum of biological activities, viz. antibacterial (Foroumadi et al., 2007), antifungal (Upadhayaya et al., 2004), anticancer (Chen et al., 2006), antiparasitic (Cunico et al., 2009), antihistamine (Smits et al., 2008) or antidepressive activities (Becker et al., 2006). Antidiabetic, anti-inflammatory, antitubercular, antimalarial, anticonvulsant, antipyretic, antitumor, anthelmintic and analgesic activities (Gan et al., 2009a,b; Willems & Ilzerman, 2010) have also been found to be caused by this versatile moiety. In view of these important properties, we have undertaken the synthesis and X-ray diffraction study of the title compound.
The molecular entities of the title compound, consisting of a centrosymmetric 1,4-bis(3-ammoniopropyl)piperazinediium cation and a dichromate anion, are shown in Fig. 1. In the cation, the central piperazine ring (N1/C1/C2/N1i/C1i/C2i; for symmetry operators, see Fig. 1) is substituted at the two N atoms by two ammoniopropyl moieties. The piperazine ring adopts a chair conformation, as is evident from the puckering parameters: Q = 0.599 (2) Å, τ = 180.0° and φ = 0°. Atoms N1 and N1i are on opposite sides of the C1/C1i/C2/C2i plane and are both displaced from it by 0.2446 (19) Å. The chair conformation of the cation in the title structure is very similar to those of the same cation in the crystal structures of the 2-hydroxybenzoate (Cukrowski et al., 2012), the nitrate (Junk & Smith, 2005) and the tetrahydrogenpentaborate (Jiang et al., 2009) salts, despite the differences in the size and shape of the anions in the various structures. The tetrahedral CrO4 groups in the anion of the title structure are fused together by a common O atom (O8) and are in an almost eclipsed conformation (Brandon & Brown, 1968). The Cr—O bond length follow the characteristic distribution for dichromate anions, with two longer bridging Cr—O bonds of 1.7676 (16) and 1.7746 (15) Å and six shorter terminal Cr—O bonds [range 1.5909 (19)–1.6185 (15) Å]. The Cr1—O8—Cr2 bridging angle in the complex anion is 127.48 (10)°. The tetrahedral O—Cr—O bond angles [range 106.52 (8) to 112.85 (12)°] indicate slight angular distortions.
The organic cations and inorganic anions are each arranged in rows parallel to [100] and alternate with each other along [010], forming a layered arrangement parallel to (001). N—H···O hydrogen bonds (Table 1) between the cations, involving both primary and tertiary ammonium groups, and the anions lead to a three-dimensional network structure (Figs. 2 and 3). Additional C—H···O interactions consolidate this arrangement.
Potassium dichromate and 1,4-bis(3-aminopropyl)piperazine (PDBP) were mixed in a molar ratio of 2:1 in water. Potassium dichromate was first dissolved in Millipore water of 18.2 MΩ·cm resistivity. Then the amount of PDBP was slowly added to the solution together with a few drops of concentrated hydrochloric acid and the mixture stirred for 18 h. The solution was then filtered twice with Wattmann filter paper and poured into petri dishes to evaporate at room temperature for several days. Recrystallization from water improved the quality of the material and increased the size of the crystals (maximum crystal size 5×3×2 mm3 after 35 d). A specimen was cleaved for the present structure determination.
detailsCrystal data, data collection and structure
details are summarized in Table 2. All hydrogen atoms were placed geometrically and refined using a riding model: N—H = 0.89 Å for the primary ammonium group with Uiso(H) = 1.5Ueq(N); N—H = 0.98 Å for the tertiary ammonium group with Uiso(H) = 1.2Ueq(N); C—H = 0.97 Å with Uiso(H) = 1.2Ueq(C).Data collection: APEX2 (Bruker, 2004); cell
SAINT (Bruker, 2004); data reduction: SAINT (Bruker, 2004); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2014/7 (Sheldrick, 2015b); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON (Spek, 2009).Fig. 1. The entities of the organic–inorganic title salt. Displacement ellipsoids are drawn at the 30% probability level. [Symmetry code: (i) -x + 2, -y, -z + 1.] | |
Fig. 2. The packing of the molecular entities in the crystal structure of the title salt. | |
Fig. 3. A part of the crystal structure of the title salt in a view along [100] showing N—H···O hydrogen-bonding interactions as dashed lines. C—H···O interactions are omitted for clarity. |
(C10H28N4)[Cr2O7]2 | Z = 1 |
Mr = 636.36 | F(000) = 324 |
Triclinic, P1 | Dx = 1.950 Mg m−3 |
a = 8.5361 (3) Å | Mo Kα radiation, λ = 0.71073 Å |
b = 8.6272 (3) Å | Cell parameters from 9982 reflections |
c = 8.8576 (3) Å | θ = 2.4–39.1° |
α = 77.761 (1)° | µ = 2.03 mm−1 |
β = 72.307 (1)° | T = 293 K |
γ = 60.985 (1)° | Needle, brown |
V = 541.81 (3) Å3 | 0.35 × 0.30 × 0.25 mm |
Bruker Kappa APEXII CCD diffractometer | 1913 independent reflections |
Radiation source: fine-focus sealed tube | 1835 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.020 |
ω and φ scan | θmax = 25.0°, θmin = 2.4° |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | h = −10→10 |
Tmin = 0.528, Tmax = 0.649 | k = −10→10 |
10263 measured reflections | l = −10→10 |
Refinement on F2 | 0 restraints |
Least-squares matrix: full | Hydrogen site location: inferred from neighbouring sites |
R[F2 > 2σ(F2)] = 0.023 | H-atom parameters constrained |
wR(F2) = 0.068 | w = 1/[σ2(Fo2) + (0.0379P)2 + 0.4739P] where P = (Fo2 + 2Fc2)/3 |
S = 1.06 | (Δ/σ)max < 0.001 |
1913 reflections | Δρmax = 0.44 e Å−3 |
145 parameters | Δρmin = −0.45 e Å−3 |
(C10H28N4)[Cr2O7]2 | γ = 60.985 (1)° |
Mr = 636.36 | V = 541.81 (3) Å3 |
Triclinic, P1 | Z = 1 |
a = 8.5361 (3) Å | Mo Kα radiation |
b = 8.6272 (3) Å | µ = 2.03 mm−1 |
c = 8.8576 (3) Å | T = 293 K |
α = 77.761 (1)° | 0.35 × 0.30 × 0.25 mm |
β = 72.307 (1)° |
Bruker Kappa APEXII CCD diffractometer | 1913 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | 1835 reflections with I > 2σ(I) |
Tmin = 0.528, Tmax = 0.649 | Rint = 0.020 |
10263 measured reflections |
R[F2 > 2σ(F2)] = 0.023 | 0 restraints |
wR(F2) = 0.068 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.44 e Å−3 |
1913 reflections | Δρmin = −0.45 e Å−3 |
145 parameters |
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes. |
x | y | z | Uiso*/Ueq | ||
C1 | 0.9278 (3) | 0.1703 (3) | 0.4169 (2) | 0.0217 (4) | |
H1A | 0.9548 | 0.2371 | 0.4721 | 0.026* | |
H1B | 0.8679 | 0.2498 | 0.3344 | 0.026* | |
C2 | 0.8955 (3) | −0.0195 (3) | 0.6574 (2) | 0.0209 (4) | |
H2A | 0.8158 | −0.0661 | 0.7319 | 0.025* | |
H2B | 0.9217 | 0.0454 | 0.7154 | 0.025* | |
C3 | 0.6197 (3) | 0.2538 (3) | 0.5974 (3) | 0.0247 (4) | |
H3A | 0.5710 | 0.3344 | 0.5101 | 0.030* | |
H3B | 0.6391 | 0.3191 | 0.6608 | 0.030* | |
C4 | 0.4805 (3) | 0.1911 (3) | 0.6986 (2) | 0.0218 (4) | |
H4A | 0.5194 | 0.1252 | 0.7946 | 0.026* | |
H4B | 0.4723 | 0.1127 | 0.6407 | 0.026* | |
C5 | 0.2943 (3) | 0.3494 (3) | 0.7415 (3) | 0.0259 (4) | |
H5A | 0.3046 | 0.4315 | 0.7931 | 0.031* | |
H5B | 0.2522 | 0.4109 | 0.6457 | 0.031* | |
N2 | 0.1592 (2) | 0.2910 (2) | 0.8492 (2) | 0.0261 (4) | |
H6A | 0.0501 | 0.3852 | 0.8736 | 0.039* | |
H6B | 0.1488 | 0.2168 | 0.8012 | 0.039* | |
H6C | 0.1973 | 0.2358 | 0.9376 | 0.039* | |
N1 | 0.8006 (2) | 0.1028 (2) | 0.53184 (19) | 0.0183 (3) | |
H1 | 0.7772 | 0.0338 | 0.4742 | 0.022* | |
O2 | 0.1839 (2) | 0.3536 (2) | 0.14426 (19) | 0.0359 (4) | |
O3 | 0.1272 (2) | 0.5696 (2) | 0.3451 (2) | 0.0402 (4) | |
O4 | 0.2800 (2) | 0.2224 (2) | 0.41686 (19) | 0.0359 (4) | |
O5 | 0.6705 (3) | 0.1105 (3) | −0.0133 (2) | 0.0612 (6) | |
O6 | 0.8440 (3) | 0.2646 (3) | 0.0538 (3) | 0.0564 (6) | |
O7 | 0.7517 (2) | 0.0359 (2) | 0.26223 (19) | 0.0325 (4) | |
O8 | 0.4835 (2) | 0.3730 (2) | 0.1987 (2) | 0.0370 (4) | |
Cr1 | 0.26337 (4) | 0.37840 (4) | 0.27693 (4) | 0.02227 (12) | |
Cr2 | 0.69282 (5) | 0.19141 (5) | 0.11987 (4) | 0.02748 (13) |
U11 | U22 | U33 | U12 | U13 | U23 | |
C1 | 0.0192 (10) | 0.0226 (9) | 0.0222 (10) | −0.0120 (8) | −0.0008 (8) | 0.0007 (8) |
C2 | 0.0202 (10) | 0.0260 (10) | 0.0166 (9) | −0.0124 (8) | −0.0013 (7) | −0.0014 (8) |
C3 | 0.0179 (10) | 0.0213 (10) | 0.0303 (11) | −0.0073 (8) | 0.0011 (8) | −0.0071 (8) |
C4 | 0.0157 (9) | 0.0230 (10) | 0.0246 (10) | −0.0080 (8) | −0.0029 (8) | −0.0026 (8) |
C5 | 0.0200 (10) | 0.0246 (10) | 0.0281 (11) | −0.0088 (8) | 0.0008 (8) | −0.0051 (8) |
N2 | 0.0163 (8) | 0.0313 (9) | 0.0275 (9) | −0.0091 (7) | −0.0014 (7) | −0.0056 (7) |
N1 | 0.0155 (8) | 0.0201 (8) | 0.0190 (8) | −0.0087 (7) | −0.0006 (6) | −0.0042 (6) |
O2 | 0.0460 (10) | 0.0430 (9) | 0.0291 (8) | −0.0252 (8) | −0.0145 (7) | −0.0021 (7) |
O3 | 0.0322 (9) | 0.0346 (9) | 0.0514 (10) | −0.0121 (7) | −0.0011 (8) | −0.0190 (8) |
O4 | 0.0387 (9) | 0.0418 (9) | 0.0313 (8) | −0.0217 (8) | −0.0124 (7) | 0.0042 (7) |
O5 | 0.0591 (13) | 0.0843 (15) | 0.0348 (10) | −0.0178 (12) | −0.0145 (9) | −0.0260 (10) |
O6 | 0.0323 (10) | 0.0645 (13) | 0.0619 (13) | −0.0286 (9) | 0.0011 (9) | 0.0150 (10) |
O7 | 0.0384 (9) | 0.0356 (9) | 0.0321 (8) | −0.0221 (7) | −0.0120 (7) | −0.0006 (7) |
O8 | 0.0250 (8) | 0.0364 (9) | 0.0484 (10) | −0.0163 (7) | 0.0005 (7) | −0.0085 (7) |
Cr1 | 0.02026 (19) | 0.0254 (2) | 0.02321 (19) | −0.01134 (15) | −0.00346 (13) | −0.00582 (13) |
Cr2 | 0.02130 (19) | 0.0382 (2) | 0.0210 (2) | −0.01414 (16) | −0.00041 (14) | −0.00334 (15) |
C1—N1 | 1.498 (2) | C5—N2 | 1.478 (3) |
C1—C2i | 1.502 (3) | C5—H5A | 0.9700 |
C1—H1A | 0.9700 | C5—H5B | 0.9700 |
C1—H1B | 0.9700 | N2—H6A | 0.8900 |
C2—N1 | 1.493 (2) | N2—H6B | 0.8900 |
C2—C1i | 1.502 (3) | N2—H6C | 0.8900 |
C2—H2A | 0.9700 | N1—H1 | 0.9800 |
C2—H2B | 0.9700 | O2—Cr1 | 1.6185 (15) |
C3—N1 | 1.498 (2) | O3—Cr1 | 1.6035 (16) |
C3—C4 | 1.509 (3) | O4—Cr1 | 1.6070 (16) |
C3—H3A | 0.9700 | O5—Cr2 | 1.5909 (19) |
C3—H3B | 0.9700 | O6—Cr2 | 1.6068 (18) |
C4—C5 | 1.511 (3) | O7—Cr2 | 1.6299 (16) |
C4—H4A | 0.9700 | O8—Cr2 | 1.7676 (16) |
C4—H4B | 0.9700 | O8—Cr1 | 1.7746 (15) |
N1—C1—C2i | 111.02 (16) | C4—C5—H5B | 109.6 |
N1—C1—H1A | 109.4 | H5A—C5—H5B | 108.1 |
C2i—C1—H1A | 109.4 | C5—N2—H6A | 109.5 |
N1—C1—H1B | 109.4 | C5—N2—H6B | 109.5 |
C2i—C1—H1B | 109.4 | H6A—N2—H6B | 109.5 |
H1A—C1—H1B | 108.0 | C5—N2—H6C | 109.5 |
N1—C2—C1i | 110.02 (15) | H6A—N2—H6C | 109.5 |
N1—C2—H2A | 109.7 | H6B—N2—H6C | 109.5 |
C1i—C2—H2A | 109.7 | C2—N1—C3 | 113.18 (15) |
N1—C2—H2B | 109.7 | C2—N1—C1 | 108.55 (15) |
C1i—C2—H2B | 109.7 | C3—N1—C1 | 110.86 (15) |
H2A—C2—H2B | 108.2 | C2—N1—H1 | 108.0 |
N1—C3—C4 | 112.22 (16) | C3—N1—H1 | 108.0 |
N1—C3—H3A | 109.2 | C1—N1—H1 | 108.0 |
C4—C3—H3A | 109.2 | Cr2—O8—Cr1 | 127.48 (10) |
N1—C3—H3B | 109.2 | O3—Cr1—O4 | 110.80 (9) |
C4—C3—H3B | 109.2 | O3—Cr1—O2 | 108.95 (9) |
H3A—C3—H3B | 107.9 | O4—Cr1—O2 | 109.39 (8) |
C3—C4—C5 | 109.66 (16) | O3—Cr1—O8 | 106.52 (8) |
C3—C4—H4A | 109.7 | O4—Cr1—O8 | 108.31 (8) |
C5—C4—H4A | 109.7 | O2—Cr1—O8 | 112.85 (9) |
C3—C4—H4B | 109.7 | O5—Cr2—O6 | 112.85 (12) |
C5—C4—H4B | 109.7 | O5—Cr2—O7 | 107.91 (11) |
H4A—C4—H4B | 108.2 | O6—Cr2—O7 | 109.68 (9) |
N2—C5—C4 | 110.30 (16) | O5—Cr2—O8 | 111.08 (10) |
N2—C5—H5A | 109.6 | O6—Cr2—O8 | 106.39 (10) |
C4—C5—H5A | 109.6 | O7—Cr2—O8 | 108.89 (8) |
N2—C5—H5B | 109.6 | ||
N1—C3—C4—C5 | −171.94 (16) | C2i—C1—N1—C3 | −176.16 (16) |
C3—C4—C5—N2 | −176.35 (16) | Cr2—O8—Cr1—O3 | 175.26 (12) |
C1i—C2—N1—C3 | 178.15 (15) | Cr2—O8—Cr1—O4 | 56.03 (15) |
C1i—C2—N1—C1 | −58.3 (2) | Cr2—O8—Cr1—O2 | −65.22 (15) |
C4—C3—N1—C2 | −64.5 (2) | Cr1—O8—Cr2—O5 | 52.36 (17) |
C4—C3—N1—C1 | 173.31 (16) | Cr1—O8—Cr2—O6 | 175.53 (13) |
C2i—C1—N1—C2 | 58.9 (2) | Cr1—O8—Cr2—O7 | −66.33 (14) |
Symmetry code: (i) −x+2, −y, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1A···O3ii | 0.97 | 2.28 | 3.176 (3) | 152 |
C1—H1A···O4iii | 0.97 | 2.61 | 3.248 (3) | 123 |
C1—H1B···O6 | 0.97 | 2.53 | 3.353 (3) | 143 |
C2—H2A···O2iv | 0.97 | 2.49 | 3.298 (3) | 141 |
C2—H2A···O4iv | 0.97 | 2.59 | 3.061 (3) | 110 |
C2—H2B···O7i | 0.97 | 2.59 | 3.232 (2) | 124 |
C3—H3B···O3ii | 0.97 | 2.58 | 3.383 (3) | 140 |
C4—H4A···O5v | 0.97 | 2.38 | 3.208 (3) | 143 |
C4—H4B···O7iv | 0.97 | 2.64 | 3.309 (2) | 127 |
N2—H6A···O2vi | 0.89 | 2.18 | 3.040 (2) | 161 |
N2—H6B···O7iv | 0.89 | 2.05 | 2.854 (2) | 149 |
N2—H6C···O2v | 0.89 | 2.22 | 2.865 (2) | 129 |
N2—H6C···O5iv | 0.89 | 2.64 | 3.239 (3) | 125 |
N1—H1···O4iv | 0.98 | 2.43 | 3.113 (2) | 126 |
N1—H1···O7 | 0.98 | 1.95 | 2.763 (2) | 139 |
Symmetry codes: (i) −x+2, −y, −z+1; (ii) −x+1, −y+1, −z+1; (iii) x+1, y, z; (iv) −x+1, −y, −z+1; (v) x, y, z+1; (vi) −x, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
C1—H1A···O3i | 0.97 | 2.28 | 3.176 (3) | 152.3 |
C1—H1A···O4ii | 0.97 | 2.61 | 3.248 (3) | 123.4 |
C1—H1B···O6 | 0.97 | 2.53 | 3.353 (3) | 143.1 |
C2—H2A···O2iii | 0.97 | 2.49 | 3.298 (3) | 140.8 |
C2—H2A···O4iii | 0.97 | 2.59 | 3.061 (3) | 110.2 |
C2—H2B···O7iv | 0.97 | 2.59 | 3.232 (2) | 124.2 |
C3—H3B···O3i | 0.97 | 2.58 | 3.383 (3) | 139.6 |
C4—H4A···O5v | 0.97 | 2.38 | 3.208 (3) | 143.2 |
C4—H4B···O7iii | 0.97 | 2.64 | 3.309 (2) | 126.7 |
N2—H6A···O2vi | 0.89 | 2.18 | 3.040 (2) | 161.4 |
N2—H6B···O7iii | 0.89 | 2.05 | 2.854 (2) | 149.0 |
N2—H6C···O2v | 0.89 | 2.22 | 2.865 (2) | 128.7 |
N2—H6C···O5iii | 0.89 | 2.64 | 3.239 (3) | 125.1 |
N1—H1···O4iii | 0.98 | 2.43 | 3.113 (2) | 126.3 |
N1—H1···O7 | 0.98 | 1.95 | 2.763 (2) | 138.7 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) x+1, y, z; (iii) −x+1, −y, −z+1; (iv) −x+2, −y, −z+1; (v) x, y, z+1; (vi) −x, −y+1, −z+1. |
Experimental details
Crystal data | |
Chemical formula | (C10H28N4)[Cr2O7]2 |
Mr | 636.36 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 293 |
a, b, c (Å) | 8.5361 (3), 8.6272 (3), 8.8576 (3) |
α, β, γ (°) | 77.761 (1), 72.307 (1), 60.985 (1) |
V (Å3) | 541.81 (3) |
Z | 1 |
Radiation type | Mo Kα |
µ (mm−1) | 2.03 |
Crystal size (mm) | 0.35 × 0.30 × 0.25 |
Data collection | |
Diffractometer | Bruker Kappa APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2004) |
Tmin, Tmax | 0.528, 0.649 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 10263, 1913, 1835 |
Rint | 0.020 |
(sin θ/λ)max (Å−1) | 0.595 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.023, 0.068, 1.06 |
No. of reflections | 1913 |
No. of parameters | 145 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.44, −0.45 |
Computer programs: APEX2 (Bruker, 2004), SAINT (Bruker, 2004), SHELXT (Sheldrick, 2015a), SHELXL2014/7 (Sheldrick, 2015b), ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009), WinGX (Farrugia, 2012) and PLATON (Spek, 2009).
Acknowledgements
The authors are grateful to the SAIF, IIT, Madras, India, for the data collection.
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