catena-Poly[[[aqua­copper(II)]-bis­[μ-bis­(3,5-dimethyl-1H-pyrazol-4-yl) selenide-κ2N2:N2′]] dichloride monohydrate]

Seredyuk, M.; Moroz, Y.S.; Znovjyak, K.O.; Pavlenko, V.A.; Fritsky, I.O.

doi:10.1107/S1600536810007403

metal-organic compounds

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ISSN: 2056-9890

Volume 66| Part 4| April 2010| Page m363

doi:10.1107/S1600536810007403

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catena-Poly[[[aquacopper(II)]-bis[μ-bis(3,5-dimethyl-1H-pyrazol-4-yl) selenide-κ²N²:N^2′]] dichloride monohydrate]

Maksym Seredyuk,^a ^* Yurii S. Moroz,^a Kateryna O. Znovjyak,^a Vadim A. Pavlenko ^a and Igor O. Fritsky ^a

^aDepartment of Chemistry, National Taras Shevchenko University, Volodymyrska Street 64, 01601 Kyiv, Ukraine
^*Correspondence e-mail: mcs@univ.kiev.ua

(Received 18 February 2010; accepted 26 February 2010; online 3 March 2010)

In the title compound, {[Cu(C₁₀H₁₄N₄Se)₂(H₂O)]Cl₂·H₂O}_n, the Cu^II ion, lying on a twofold rotation axis, has a square-pyramidal geometry constituted by four N atoms of pyrazolyl groups in the basal plane and an apical O atom of a water molecule. A pair of bis(3,5-dimethyl-1H-pyrazol-4-yl) selenide ligands bridge the Cu centers into a polymeric double-chain extending along [001]. The chloride anions are involved in intermolecular N—H⋯Cl and O—H⋯Cl hydrogen bonds, which link the chains into a three-dimensional network.

Related literature

For general background to the applications of coordination polymers, see: Farha et al. (2009 ); Shibahara et al. (2007 ); Zhang et al. (2009 ). For our studies of similar complexes, see: Seredyuk et al. (2007 , 2009 ).

Experimental

Crystal data

[Cu(C₁₀H₁₄N₄Se)₂(H₂O)]Cl₂·H₂O
M_r = 708.90
Monoclinic, C 2/c
a = 11.332 (1) Å
b = 13.229 (2) Å
c = 18.786 (1) Å
β = 92.45 (3)°
V = 2813.7 (5) Å³
Z = 4
Mo Kα radiation
μ = 3.59 mm⁻¹
T = 100 K
0.10 × 0.05 × 0.01 mm

Data collection

Kuma KM-4 CCD diffractometer
6625 measured reflections
2377 independent reflections
2217 reflections with I > 2σ(I)
R_int = 0.061

Refinement

R[F² > 2σ(F²)] = 0.026
wR(F²) = 0.072
S = 1.10
2377 reflections
164 parameters
H-atom parameters constrained
Δρ_max = 0.57 e Å⁻³
Δρ_min = −0.44 e Å⁻³

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1W—H1W⋯Cl1	0.93	2.43	3.354 (2)	169
O1—H1O1⋯Cl1	0.88	2.25	3.0702 (10)	156
N2—H2N⋯Cl1ⁱ	0.88	2.33	3.117 (2)	148
N4—H4N⋯Cl1ⁱⁱ	0.88	2.27	3.144 (2)	176
Symmetry codes: (i) $[-x-{\script{1\over 2}}, y+{\script{1\over 2}}, -z+{\script{1\over 2}}]$ ; (ii) $[-x, y, -z+{\script{1\over 2}}]$ .

Data collection: KM-4 CCD Software. (Kuma Diffraction, 1998 $[Kuma Diffraction (1998). KM-4 CCD Software. Kuma Diffraction, Wrocław, Poland.]$ ); cell refinement: KM-4 CCD Software.; data reduction: KM-4 CCD Software.; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997 ); software used to prepare material for publication: WinGX (Farrugia, 1999 ).

Supporting information

Crystal structure: contains datablocks I, global. DOI: 10.1107/S1600536810007403/hy2286sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S1600536810007403/hy2286Isup2.hkl

checkCIF report

Comment top

Study of metal-organic polymers is a well elaborated research area in coordination chemistry. Infinite molecular polymeric arrays are potentially applicable as specifically ordered crystalline substances with reversible selective sorption (Farha et al., 2009; Zhang et al., 2009), electrical conductivity (Zhang et al., 2009) and molecular magnetism functionality (Shibahara et al., 2007).

The title compound was prepared in a water–methanolic medium by mixing solutions of CuCl₂.2H₂O and the bis(3,5-dimethyl-1H-pyrazolyl)selenide (L) ligand. It is similar to the copper compounds reported recently (Seredyuk et al., 2007, 2009). A square pyramidal environment of the Cu^II ion is constituted by four non-coplanar N atoms of pyrazolyl rings [the Cu—N distances are 1.988 (2) and 2.017 (2) Å, the Cu—O distance is 2.208 (3) Å]. Adjacent Cu^II ions are linked by symmetrically equivalent ligands in a double-stranded bridge fashion (Fig. 1). Formed one-dimensional linear chain is running along the c axis, where the Cu atom deviates from the average basal plane by a value of 0.392 (1) Å (Fig. 2). The NH group of a pyrazole ring is involved in hydrogen bonding with chloride anion (Table 1), which further forms hydrogen bonds with both free and coordinated water molecules and additionally with a pyrazole ring of a neighbouring polymeric chain (Table 1). As a result, a dense network of hydrogen bonds is formed.

Related literature top

For general background to the applications of coordination polymers, see: Farha et al. (2009); Shibahara et al. (2007); Zhang et al. (2009). For our studies of similar complexes, see: Seredyuk et al. (2007, 2009).

Experimental top

The ligand L was prepared according to a previously reported method (Seredyuk et al., 2007). Copper(II) chloride dihydrate (0.034 g, 0.19 mmol) in water (5 ml) was added to 5 ml of hot methanol solution of L (0.100 g, 0.37 mmol). The solution was left for slow cooling at room temperature. After several days plate-like blue-violet crystals of the title compound suitable for X-ray analysis were isolated. Analysis, calculated for C₂₀H₃₂Cl₂CuN₈O₂Se₂: C 33.89, H 4.55, N 15.81%; found: C 33.67, H 4.51, N 15.60%.

Computing details top

Data collection: KM-4 CCD Software (Kuma Diffraction, 1998); cell refinement: KM-4 CCD Software (Kuma Diffraction, 1998); data reduction: KM-4 CCD Software; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).

Figures top

	Fig. 1. A portion of the double-chain structure of the title compound, showing the 50% probability displacement ellipsoids. H atoms are omitted for clarity. Dashed lines denote hydrogen bonds. [Symmetry codes: (i) -x, y, 1/2-z; (ii) -x, -y, 1-z.]
	Fig. 2. A packing diagram of the title compound. H atoms are omitted for clarity.

catena-Poly[[[aquacopper(II)]-bis[µ-bis(3,5-dimethyl-1H- pyrazol-4-yl) selenide-κ²N²:N^2']] dichloride monohydrate] top

Crystal data top

[Cu(C₁₀H₁₄N₄Se)₂(H₂O)]Cl₂·H₂O	F(000) = 1420
M_r = 708.90	D_x = 1.673 Mg m⁻³
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2yc	Cell parameters from 6625 reflections
a = 11.332 (1) Å	θ = 3.2–28.4°
b = 13.229 (2) Å	µ = 3.59 mm⁻¹
c = 18.786 (1) Å	T = 100 K
β = 92.45 (3)°	Plates, blue
V = 2813.7 (5) Å³	0.10 × 0.05 × 0.01 mm
Z = 4

Data collection top

Kuma KM-4 CCD diffractometer	2217 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tube	R_int = 0.061
Graphite monochromator	θ_max = 25.0°, θ_min = 3.2°
ω scans	h = −13→7
6625 measured reflections	k = −15→15
2377 independent reflections	l = −22→22

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)] = 0.026	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.072	H-atom parameters constrained
S = 1.10	w = 1/[σ²(F_o²) + (0.0419P)² + 1.7165P] where P = (F_o² + 2F_c²)/3
2377 reflections	(Δ/σ)_max < 0.001
164 parameters	Δρ_max = 0.57 e Å⁻³
0 restraints	Δρ_min = −0.44 e Å⁻³

Crystal data top

[Cu(C₁₀H₁₄N₄Se)₂(H₂O)]Cl₂·H₂O	V = 2813.7 (5) Å³
M_r = 708.90	Z = 4
Monoclinic, C2/c	Mo Kα radiation
a = 11.332 (1) Å	µ = 3.59 mm⁻¹
b = 13.229 (2) Å	T = 100 K
c = 18.786 (1) Å	0.10 × 0.05 × 0.01 mm
β = 92.45 (3)°

Data collection top

Kuma KM-4 CCD diffractometer	2217 reflections with I > 2σ(I)
6625 measured reflections	R_int = 0.061
2377 independent reflections

Refinement top

R[F² > 2σ(F²)] = 0.026	0 restraints
wR(F²) = 0.072	H-atom parameters constrained
S = 1.10	Δρ_max = 0.57 e Å⁻³
2377 reflections	Δρ_min = −0.44 e Å⁻³
164 parameters

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

	x	y	z	U_iso*/U_eq
C1	−0.0470 (2)	−0.1461 (2)	0.41623 (14)	0.0171 (6)
H22A	0.0111	−0.1105	0.4471	0.026*
H22B	−0.0068	−0.1790	0.3773	0.026*
H22C	−0.0873	−0.1974	0.4440	0.026*
C2	−0.1350 (2)	−0.07273 (19)	0.38631 (13)	0.0112 (5)
C3	0.2414 (2)	0.04235 (18)	0.58358 (13)	0.0106 (5)
C4	−0.2939 (2)	0.02624 (19)	0.36872 (14)	0.0137 (5)
C5	−0.4086 (2)	0.0822 (2)	0.36926 (16)	0.0232 (7)
H9A	−0.4637	0.0538	0.3330	0.035*
H9B	−0.3950	0.1538	0.3589	0.035*
H9C	−0.4421	0.0758	0.4163	0.035*
C6	0.0587 (2)	0.14112 (19)	0.38756 (14)	0.0124 (5)
H5A	0.0236	0.1593	0.3407	0.019*
H5B	0.1033	0.1988	0.4074	0.019*
H5C	−0.0040	0.1230	0.4196	0.019*
C7	0.1401 (2)	0.05297 (19)	0.37995 (13)	0.0106 (5)
C8	0.2365 (2)	0.02232 (19)	0.42508 (13)	0.0115 (5)
C9	0.2796 (2)	−0.0650 (2)	0.39493 (13)	0.0129 (5)
C10	0.3787 (2)	−0.1344 (2)	0.41780 (15)	0.0205 (6)
H14A	0.3463	−0.1955	0.4392	0.031*
H14B	0.4311	−0.1001	0.4529	0.031*
H14C	0.4234	−0.1532	0.3763	0.031*
N1	−0.12324 (17)	−0.02426 (15)	0.32427 (11)	0.0112 (4)
N2	−0.22165 (18)	0.03492 (15)	0.31502 (11)	0.0128 (4)
H2N	−0.2356	0.0742	0.2778	0.015*
N3	0.12555 (17)	−0.01244 (16)	0.32624 (11)	0.0113 (4)
N4	0.21226 (19)	−0.08360 (16)	0.33652 (12)	0.0123 (5)
H4N	0.2223	−0.1354	0.3080	0.015*
O1	0.0000	−0.19654 (18)	0.2500	0.0154 (5)
H1O1	−0.0625	−0.2317	0.2606	0.023*
O1W	−0.5000	−0.1193 (3)	0.2500	0.0387 (8)
H1W	−0.4338	−0.1589	0.2619	0.058*
Cl1	−0.25642 (5)	−0.26253 (5)	0.26925 (3)	0.01824 (17)
Cu1	0.0000	−0.02962 (3)	0.2500	0.00888 (13)
Se1	0.30884 (2)	0.097275 (18)	0.501388 (12)	0.01122 (11)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.0139 (12)	0.0217 (15)	0.0161 (14)	0.0071 (11)	0.0043 (11)	0.0059 (10)
C2	0.0097 (11)	0.0122 (12)	0.0116 (13)	−0.0016 (10)	−0.0015 (10)	−0.0020 (10)
C3	0.0099 (11)	0.0106 (12)	0.0114 (13)	−0.0014 (9)	0.0035 (10)	−0.0007 (9)
C4	0.0112 (12)	0.0169 (14)	0.0134 (14)	0.0001 (10)	0.0038 (11)	−0.0019 (10)
C5	0.0174 (14)	0.0321 (17)	0.0204 (15)	0.0133 (12)	0.0048 (12)	0.0067 (12)
C6	0.0120 (12)	0.0111 (13)	0.0139 (13)	0.0018 (10)	0.0005 (10)	−0.0001 (9)
C7	0.0087 (11)	0.0117 (12)	0.0113 (13)	−0.0023 (10)	0.0020 (10)	0.0011 (9)
C8	0.0077 (11)	0.0162 (13)	0.0105 (13)	−0.0012 (10)	0.0007 (10)	−0.0004 (9)
C9	0.0091 (12)	0.0158 (13)	0.0138 (14)	0.0009 (10)	0.0004 (11)	−0.0009 (10)
C10	0.0153 (13)	0.0217 (15)	0.0242 (15)	0.0091 (11)	−0.0030 (12)	−0.0013 (11)
N1	0.0090 (10)	0.0106 (11)	0.0139 (11)	0.0019 (8)	−0.0005 (9)	−0.0001 (8)
N2	0.0118 (10)	0.0162 (11)	0.0103 (11)	0.0042 (9)	−0.0009 (9)	0.0022 (8)
N3	0.0069 (10)	0.0116 (11)	0.0154 (11)	0.0024 (8)	0.0013 (9)	0.0009 (8)
N4	0.0108 (10)	0.0126 (11)	0.0134 (11)	0.0041 (8)	0.0004 (9)	−0.0020 (8)
O1	0.0122 (12)	0.0104 (13)	0.0241 (14)	0.000	0.0053 (11)	0.000
O1W	0.0318 (17)	0.0365 (19)	0.048 (2)	0.000	0.0058 (16)	0.000
Cl1	0.0215 (3)	0.0131 (3)	0.0206 (4)	−0.0055 (2)	0.0061 (3)	−0.0008 (2)
Cu1	0.0069 (2)	0.0108 (2)	0.0089 (2)	0.000	0.00069 (17)	0.000
Se1	0.00924 (16)	0.01421 (17)	0.01027 (17)	−0.00342 (9)	0.00104 (11)	−0.00041 (8)

Geometric parameters (Å, º) top

C1—C2	1.485 (3)	C7—N3	1.334 (3)
C1—H22A	0.9800	C7—C8	1.413 (4)
C1—H22B	0.9800	C8—C9	1.385 (4)
C1—H22C	0.9800	C8—Se1	1.900 (2)
C2—N1	1.342 (3)	C9—N4	1.332 (3)
C2—C3ⁱ	1.412 (3)	C9—C10	1.499 (3)
C3—C4ⁱ	1.391 (4)	C10—H14A	0.9800
C3—C2ⁱ	1.412 (3)	C10—H14B	0.9800
C3—Se1	1.896 (2)	C10—H14C	0.9800
C4—N2	1.331 (3)	N1—N2	1.368 (3)
C4—C3ⁱ	1.391 (4)	N2—H2N	0.8800
C4—C5	1.496 (4)	N3—N4	1.368 (3)
C5—H9A	0.9800	N4—H4N	0.8800
C5—H9B	0.9800	O1—H1O1	0.8771
C5—H9C	0.9800	O1W—H1W	0.9337
C6—C7	1.497 (3)	Cu1—N1ⁱⁱ	2.017 (2)
C6—H5A	0.9800	Cu1—N3ⁱⁱ	1.988 (2)
C6—H5B	0.9800	Cu1—O1	2.208 (3)
C6—H5C	0.9800

C2—C1—H22A	109.5	N4—C9—C8	106.9 (2)
C2—C1—H22B	109.5	N4—C9—C10	121.2 (2)
H22A—C1—H22B	109.5	C8—C9—C10	131.8 (2)
C2—C1—H22C	109.5	C9—C10—H14A	109.5
H22A—C1—H22C	109.5	C9—C10—H14B	109.5
H22B—C1—H22C	109.5	H14A—C10—H14B	109.5
N1—C2—C3ⁱ	109.3 (2)	C9—C10—H14C	109.5
N1—C2—C1	123.4 (2)	H14A—C10—H14C	109.5
C3ⁱ—C2—C1	127.3 (2)	H14B—C10—H14C	109.5
C4ⁱ—C3—C2ⁱ	106.1 (2)	C2—N1—N2	105.85 (19)
C4ⁱ—C3—Se1	126.76 (19)	C2—N1—Cu1	132.97 (17)
C2ⁱ—C3—Se1	126.70 (19)	N2—N1—Cu1	121.14 (15)
N2—C4—C3ⁱ	106.5 (2)	C4—N2—N1	112.3 (2)
N2—C4—C5	121.7 (2)	C4—N2—H2N	123.9
C3ⁱ—C4—C5	131.8 (2)	N1—N2—H2N	123.9
C4—C5—H9A	109.5	C7—N3—N4	105.95 (19)
C4—C5—H9B	109.5	C7—N3—Cu1	132.87 (17)
H9A—C5—H9B	109.5	N4—N3—Cu1	120.69 (16)
C4—C5—H9C	109.5	C9—N4—N3	111.8 (2)
H9A—C5—H9C	109.5	C9—N4—H4N	124.1
H9B—C5—H9C	109.5	N3—N4—H4N	124.1
C7—C6—H5A	109.5	Cu1—O1—H1O1	122.0
C7—C6—H5B	109.5	N3ⁱⁱ—Cu1—N3	166.88 (12)
H5A—C6—H5B	109.5	N3ⁱⁱ—Cu1—N1ⁱⁱ	89.60 (8)
C7—C6—H5C	109.5	N3—Cu1—N1ⁱⁱ	89.94 (8)
H5A—C6—H5C	109.5	N3ⁱⁱ—Cu1—N1	89.94 (8)
H5B—C6—H5C	109.5	N3—Cu1—N1	89.60 (8)
N3—C7—C8	109.6 (2)	N1ⁱⁱ—Cu1—N1	175.97 (11)
N3—C7—C6	121.4 (2)	N3ⁱⁱ—Cu1—O1	96.56 (6)
C8—C7—C6	129.0 (2)	N3—Cu1—O1	96.56 (6)
C9—C8—C7	105.7 (2)	N1ⁱⁱ—Cu1—O1	92.01 (6)
C9—C8—Se1	126.54 (19)	N1—Cu1—O1	92.01 (6)
C7—C8—Se1	126.90 (19)	C3—Se1—C8	103.80 (10)

N3—C7—C8—C9	0.5 (3)	C10—C9—N4—N3	178.6 (2)
C6—C7—C8—C9	178.4 (2)	C7—N3—N4—C9	0.4 (3)
N3—C7—C8—Se1	170.61 (17)	Cu1—N3—N4—C9	−172.60 (17)
C6—C7—C8—Se1	−11.5 (4)	C7—N3—Cu1—N3ⁱⁱ	38.4 (2)
C7—C8—C9—N4	−0.2 (3)	N4—N3—Cu1—N3ⁱⁱ	−150.87 (17)
Se1—C8—C9—N4	−170.41 (18)	C7—N3—Cu1—N1ⁱⁱ	126.3 (2)
C7—C8—C9—C10	−178.7 (3)	N4—N3—Cu1—N1ⁱⁱ	−62.89 (17)
Se1—C8—C9—C10	11.1 (4)	C7—N3—Cu1—N1	−49.7 (2)
C3ⁱ—C2—N1—N2	−0.7 (3)	N4—N3—Cu1—N1	121.11 (17)
C1—C2—N1—N2	179.3 (2)	C7—N3—Cu1—O1	−141.6 (2)
C3ⁱ—C2—N1—Cu1	−178.10 (17)	N4—N3—Cu1—O1	29.13 (17)
C1—C2—N1—Cu1	2.0 (4)	C2—N1—Cu1—N3ⁱⁱ	143.2 (2)
C3ⁱ—C4—N2—N1	−0.1 (3)	N2—N1—Cu1—N3ⁱⁱ	−33.83 (17)
C5—C4—N2—N1	−178.6 (2)	C2—N1—Cu1—N3	−49.9 (2)
C2—N1—N2—C4	0.5 (3)	N2—N1—Cu1—N3	133.06 (17)
Cu1—N1—N2—C4	178.26 (17)	C2—N1—Cu1—O1	46.7 (2)
C8—C7—N3—N4	−0.5 (3)	N2—N1—Cu1—O1	−130.39 (16)
C6—C7—N3—N4	−178.6 (2)	C4ⁱ—C3—Se1—C8	102.0 (2)
C8—C7—N3—Cu1	171.23 (17)	C2ⁱ—C3—Se1—C8	−87.0 (2)
C6—C7—N3—Cu1	−6.9 (4)	C9—C8—Se1—C3	−92.4 (2)
C8—C9—N4—N3	−0.1 (3)	C7—C8—Se1—C3	99.4 (2)

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

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1W···Cl1	0.93	2.43	3.354 (2)	169
O1—H1O1···Cl1	0.88	2.25	3.0702 (10)	156
N2—H2N···Cl1ⁱⁱⁱ	0.88	2.33	3.117 (2)	148
N4—H4N···Cl1ⁱⁱ	0.88	2.27	3.144 (2)	176

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

Experimental details

Crystal data
Chemical formula	[Cu(C₁₀H₁₄N₄Se)₂(H₂O)]Cl₂·H₂O
M_r	708.90
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	100
a, b, c (Å)	11.332 (1), 13.229 (2), 18.786 (1)
β (°)	92.45 (3)
V (Å³)	2813.7 (5)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	3.59
Crystal size (mm)	0.10 × 0.05 × 0.01

Data collection
Diffractometer	Kuma KM-4 CCD diffractometer
Absorption correction	–
No. of measured, independent and observed [I > 2σ(I)] reflections	6625, 2377, 2217
R_int	0.061
(sin θ/λ)_max (Å⁻¹)	0.595

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.026, 0.072, 1.10
No. of reflections	2377
No. of parameters	164
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.57, −0.44

Computer programs: KM-4 CCD Software (Kuma Diffraction, 1998), KM-4 CCD Software, SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), WinGX (Farrugia, 1999).

Hydrogen-bond geometry (Å, º) top

D—H···A	D—H	H···A	D···A	D—H···A
O1W—H1W···Cl1	0.93	2.43	3.354 (2)	169
O1—H1O1···Cl1	0.88	2.25	3.0702 (10)	156
N2—H2N···Cl1ⁱ	0.88	2.33	3.117 (2)	148
N4—H4N···Cl1ⁱⁱ	0.88	2.27	3.144 (2)	176

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

Acknowledgements

The authors thank the Ministry of Education and Science of Ukraine for financial support (grant No. M/263-2008).

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