Dichloridobis{1-[(2-methyl­benzimidazol-1-yl-κN3)meth­yl]benzotriazole}zinc

Song, L.; Zhao, M.; Cui, G.; Gao, J.; Lin, L.

doi:10.1107/S160053681203526X

metal-organic compounds

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ISSN: 2056-9890

Volume 68| Part 9| September 2012| Page m1179

doi:10.1107/S160053681203526X

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Dichloridobis{1-[(2-methylbenzimidazol-1-yl-κN³)methyl]benzotriazole}zinc

Lianqing Song,^a ^* Meihong Zhao,^b Guoshi Cui,^c Jianghua Gao ^d and Lin Lin ^e

^aDepartment of Chemistry, Henan Institute of Education, Zhengzhou 450046, People's Republic of China, ^bIsotope Institute of Henan Acacemy of Sciences, Zhengzhou 450052, People's Republic of China, ^cHenan Engineering Research Center For Electron Beam Application, Zhengzhou 450052, People's Republic of China, ^dZhengzhou Huitong Advertisement Material Co., Ltd, Zhengzhou 50064, People's Republic of China, and ^eLight Industry Mechanical Institute of Henan Province, Luoyang 471099, People's Republic of China
^*Correspondence e-mail: htlianqingsong@126.com

(Received 12 June 2012; accepted 9 August 2012; online 15 August 2012)

The title mononuclear Zn^II complex, [ZnCl₂(C₁₅H₁₃N₅)₂], is isotypic with the previously reported Hg^II complex. The Zn^II atom is located on a twofold rotation axis and has a distorted tetrahedral environment of two Cl atoms and two N atoms from two heterocyclic ligands. In the crystal, complex molecules are extended by intermolecular π–π interactions [centroid–centroid distance = 3.792 (2) Å] into a three-dimensional supramolecular network.

Related literature

For background information on complexes constructed from N-heterocyclic ligands, see: Liu et al. (2012 ); Bondar et al. (2012 ); Shao et al. (2008 ); Su et al. (2003 ). For the isotypic Hg^II complex, see: Wu et al. (2009 ).

Experimental

Crystal data

[ZnCl₂(C₁₅H₁₃N₅)₂]
M_r = 662.90
Monoclinic, C 2/c
a = 15.721 (4) Å
b = 12.617 (4) Å
c = 14.728 (3) Å
β = 99.13 (3)°
V = 2884.3 (13) Å³
Z = 4
Mo Kα radiation
μ = 1.08 mm⁻¹
T = 295 K
0.22 × 0.20 × 0.20 mm

Data collection

Rigaku Saturn CCD diffractometer
Absorption correction: multi-scan (CrystalClear; Rigaku/MSC, 2006 ) T_min = 0.797, T_max = 0.813
17560 measured reflections
3423 independent reflections
2977 reflections with I > 2σ(I)
R_int = 0.041

Refinement

R[F² > 2σ(F²)] = 0.050
wR(F²) = 0.137
S = 1.07
3423 reflections
196 parameters
H-atom parameters constrained
Δρ_max = 0.25 e Å⁻³
Δρ_min = −0.30 e Å⁻³

Data collection: CrystalClear (Rigaku/MSC, 2006); cell refinement: CrystalClear; data reduction: CrystalClear; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ); program(s) used to refine structure: SHELXS97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL.

Supporting information

Crystal structure: contains datablocks global, I. DOI: 10.1107/S160053681203526X/rk2368sup1.cif

Structure factors: contains datablock I. DOI: 10.1107/S160053681203526X/rk2368Isup2.hkl

checkCIF report

Comment top

Multidentate organic ligands have received extensive attention in supramolecular chemistry due to their abilities in constructing novel architectures with interesting properties (Liu et al., 2012; Bondar et al., 2012). Among them, the ligands bearing benzotriazole or benzimidazole groups are good candidates because of their various coordiantion modes and biological activities (Shao et al., 2008; Su et al., 2003). The 1-(2-methylbenzoimidazol-3-yl-methyl)-benzotriazole, simultaneously has the benzotriazole group and the benzoimidazole group, which can be an excellent ligand to form new structures. In this work, we selected this ligand as linker to self-assemble with ZnCl₂ and obtained the title mononuclear complex, ZnCl₂(C₁₅H₁₃N₅)₂, which is isostructural with the previously reported Hg^II complex (Wu et al., 2009). The Zn atom placed on twofold axis. As shown in Fig. 1, the Zn^II is in a distorted tetrahedral geometry and coordinated by two Cl atoms and two N atoms from two 1-(2-methylbenzimidazol-1-yl-methyl)benzotriazole ligands. Because the 2-position substituent methyl of benzimidazole ring is an electrondonating group, the N atom of benzimidazole ring has higher electron density than others. Therefore, the N atom of benzimidazole ring is prior to coordinate with metal ions, which leads to the ligand adopting a monodentate fashion. In addition, intramolecular π–π interactions between the imidazole rings and phenyl rings of benzimidazole rings (centroid-to-centroid separation: 3.631 (19)Å), intermolecular π–π interactions between phenyl rings of benzotriazole rings (centroid-to-centroid separation: 3.792 (2)Å) consolidate the crystal packing, as depicted in Fig. 2.

Related literature top

For background information on complexes constructed from N-heterocyclic ligands, see: Liu et al. (2012); Bondar et al. (2012); Shao et al. (2008); Su et al. (2003). For the isotypic Hg^II complex, see: Wu et al. (2009).

Experimental top

Synthesis of ZnCl₂(C₁₅H₁₃N₅)₂: a methanol solution (4 ml) of ligand 1-(2-methyl-benzoimidazol-3-yl-methyl)-benzotriazole (26.3 mg, 0.1 mmol) was added dropwise to the methanol solution (5 ml) of ZnCl₂ (13.6 mg, 0.1 mmol) to give a clear solution. After one week, colorless needle crystals were obtained by slow evaporation of the solvents at room temperature.

Computing details top

Data collection: CrystalClear (Rigaku/MSC, 2006); cell refinement: CrystalClear (Rigaku/MSC, 2006); data reduction: CrystalClear (Rigaku/MSC, 2006); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXS97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Figures top

	Fig. 1. Molecular structure of the title complex with the atom numbering scheme. Displacement ellipsolids are drawn at 30% probability level. Symmetry code: (i) -x, y, 1/2-z.
	Fig. 2. View of the crystal packing of the title complex, showing the three-dimensional supramolecular structure.

Dichloridobis{1-[(2-methylbenzimidazol-1-yl- κN³)methyl]benzotriazole}zinc top

Crystal data top

[ZnCl₂(C₁₅H₁₃N₅)₂]	F(000) = 1360
M_r = 662.90	D_x = 1.527 Mg m⁻³
Monoclinic, C2/c	Mo Kα radiation, λ = 0.71073 Å
Hall symbol: -C 2yc	Cell parameters from 3926 reflections
a = 15.721 (4) Å	θ = 2.1–27.9°
b = 12.617 (4) Å	µ = 1.08 mm⁻¹
c = 14.728 (3) Å	T = 295 K
β = 99.13 (3)°	Needle, colourless
V = 2884.3 (13) Å³	0.22 × 0.20 × 0.20 mm
Z = 4

Data collection top

Rigaku Saturn CCD diffractometer	3423 independent reflections
Radiation source: fine-focus sealed tube	2977 reflections with I > 2σ(I)
Graphite monochromator	R_int = 0.041
Detector resolution: 28.5714 pixels mm^-1	θ_max = 27.9°, θ_min = 2.4°
ω scans	h = −20→20
Absorption correction: multi-scan (CrystalClear; Rigaku/MSC, 2006)	k = −16→16
T_min = 0.797, T_max = 0.813	l = −19→19
17560 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)] = 0.050	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.137	H-atom parameters constrained
S = 1.07	w = 1/[σ²(F_o²) + (0.0749P)² + 0.7625P] where P = (F_o² + 2F_c²)/3
3423 reflections	(Δ/σ)_max < 0.001
196 parameters	Δρ_max = 0.25 e Å⁻³
0 restraints	Δρ_min = −0.30 e Å⁻³

Crystal data top

[ZnCl₂(C₁₅H₁₃N₅)₂]	V = 2884.3 (13) Å³
M_r = 662.90	Z = 4
Monoclinic, C2/c	Mo Kα radiation
a = 15.721 (4) Å	µ = 1.08 mm⁻¹
b = 12.617 (4) Å	T = 295 K
c = 14.728 (3) Å	0.22 × 0.20 × 0.20 mm
β = 99.13 (3)°

Data collection top

Rigaku Saturn CCD diffractometer	3423 independent reflections
Absorption correction: multi-scan (CrystalClear; Rigaku/MSC, 2006)	2977 reflections with I > 2σ(I)
T_min = 0.797, T_max = 0.813	R_int = 0.041
17560 measured reflections

Refinement top

R[F² > 2σ(F²)] = 0.050	0 restraints
wR(F²) = 0.137	H-atom parameters constrained
S = 1.07	Δρ_max = 0.25 e Å⁻³
3423 reflections	Δρ_min = −0.30 e Å⁻³
196 parameters

Special details top

Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'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
Zn1	0.0000	0.58999 (3)	0.2500	0.04555 (17)
N1	0.02430 (13)	0.48160 (16)	0.15242 (14)	0.0412 (5)
N2	0.08873 (13)	0.35668 (17)	0.08201 (15)	0.0421 (5)
N3	0.14451 (15)	0.18031 (19)	0.08324 (15)	0.0489 (5)
N4	0.14628 (19)	0.1031 (2)	0.01911 (17)	0.0623 (7)
N5	0.13466 (19)	0.0122 (2)	0.05545 (18)	0.0653 (7)
C1	−0.03854 (16)	0.42678 (18)	0.09166 (16)	0.0379 (5)
C2	−0.12745 (17)	0.4407 (2)	0.07150 (18)	0.0472 (6)
H2	−0.1550	0.4934	0.1000	0.057*
C3	−0.17295 (18)	0.3735 (3)	0.0079 (2)	0.0525 (7)
H3	−0.2325	0.3805	−0.0062	0.063*
C4	−0.13169 (19)	0.2953 (2)	−0.0360 (2)	0.0567 (7)
H4	−0.1646	0.2515	−0.0787	0.068*
C5	−0.04384 (19)	0.2807 (2)	−0.01797 (18)	0.0493 (6)
H5	−0.0163	0.2288	−0.0475	0.059*
C6	0.00111 (16)	0.34824 (19)	0.04711 (16)	0.0387 (5)
C7	0.09879 (16)	0.4373 (2)	0.14406 (17)	0.0417 (6)
C8	0.18438 (18)	0.4695 (3)	0.1936 (2)	0.0620 (8)
H8A	0.1787	0.5340	0.2268	0.093*
H8B	0.2230	0.4808	0.1502	0.093*
H8C	0.2068	0.4147	0.2360	0.093*
C9	0.15636 (18)	0.2894 (2)	0.0572 (2)	0.0509 (7)
H9A	0.1560	0.2934	−0.0086	0.061*
H9B	0.2119	0.3146	0.0878	0.061*
C10	0.13101 (16)	0.1366 (2)	0.16454 (17)	0.0454 (6)
C11	0.1241 (2)	0.1776 (3)	0.25161 (19)	0.0562 (7)
H11	0.1292	0.2497	0.2644	0.067*
C12	0.1096 (2)	0.1053 (3)	0.3164 (2)	0.0637 (9)
H12	0.1046	0.1293	0.3750	0.076*
C13	0.10205 (19)	−0.0044 (3)	0.2980 (2)	0.0668 (9)
H13	0.0923	−0.0508	0.3444	0.080*
C14	0.1089 (2)	−0.0433 (3)	0.2129 (2)	0.0633 (8)
H14	0.1034	−0.1154	0.2002	0.076*
C15	0.12426 (18)	0.0289 (2)	0.14573 (19)	0.0512 (7)
Cl1	−0.11365 (6)	0.69095 (6)	0.19298 (5)	0.0643 (3)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Zn1	0.0627 (3)	0.0303 (2)	0.0417 (3)	0.000	0.0021 (2)	0.000
N1	0.0454 (11)	0.0342 (10)	0.0424 (11)	−0.0021 (9)	0.0020 (9)	−0.0038 (9)
N2	0.0410 (11)	0.0413 (11)	0.0447 (12)	0.0035 (9)	0.0089 (9)	−0.0003 (9)
N3	0.0578 (14)	0.0496 (13)	0.0404 (12)	0.0149 (11)	0.0118 (10)	−0.0014 (10)
N4	0.0825 (19)	0.0610 (16)	0.0442 (13)	0.0202 (14)	0.0125 (13)	−0.0077 (11)
N5	0.0884 (19)	0.0519 (15)	0.0553 (15)	0.0168 (14)	0.0102 (13)	−0.0051 (12)
C1	0.0421 (13)	0.0353 (11)	0.0356 (12)	−0.0016 (10)	0.0043 (10)	0.0002 (9)
C2	0.0445 (14)	0.0487 (14)	0.0481 (15)	0.0018 (11)	0.0065 (11)	−0.0033 (12)
C3	0.0403 (14)	0.0606 (17)	0.0552 (16)	−0.0069 (13)	0.0038 (12)	−0.0026 (14)
C4	0.0582 (18)	0.0581 (17)	0.0518 (16)	−0.0180 (14)	0.0024 (13)	−0.0129 (13)
C5	0.0578 (17)	0.0447 (14)	0.0461 (14)	−0.0049 (12)	0.0108 (12)	−0.0100 (11)
C6	0.0444 (13)	0.0355 (12)	0.0367 (12)	−0.0022 (10)	0.0078 (10)	0.0021 (9)
C7	0.0410 (13)	0.0404 (13)	0.0427 (13)	−0.0014 (10)	0.0039 (10)	0.0008 (11)
C8	0.0474 (16)	0.070 (2)	0.0648 (19)	−0.0058 (14)	−0.0036 (14)	−0.0091 (16)
C9	0.0498 (15)	0.0562 (16)	0.0497 (15)	0.0084 (13)	0.0172 (12)	0.0017 (13)
C10	0.0432 (13)	0.0531 (15)	0.0397 (13)	0.0127 (12)	0.0062 (11)	0.0013 (11)
C11	0.0612 (18)	0.0644 (18)	0.0431 (15)	0.0068 (14)	0.0089 (13)	−0.0028 (13)
C12	0.0542 (17)	0.098 (3)	0.0389 (15)	0.0078 (17)	0.0077 (13)	0.0052 (16)
C13	0.0517 (17)	0.084 (2)	0.063 (2)	0.0022 (16)	0.0031 (14)	0.0250 (18)
C14	0.0589 (18)	0.0569 (18)	0.071 (2)	0.0042 (15)	0.0001 (15)	0.0115 (16)
C15	0.0485 (15)	0.0522 (16)	0.0514 (15)	0.0120 (12)	0.0033 (12)	0.0016 (13)
Cl1	0.0925 (6)	0.0456 (4)	0.0524 (4)	0.0254 (4)	0.0040 (4)	0.0033 (3)

Geometric parameters (Å, º) top

Zn1—N1ⁱ	2.063 (2)	C4—C5	1.377 (4)
Zn1—N1	2.063 (2)	C4—H4	0.9300
Zn1—Cl1ⁱ	2.2458 (9)	C5—C6	1.389 (3)
Zn1—Cl1	2.2458 (9)	C5—H5	0.9300
N1—C7	1.321 (3)	C7—C8	1.482 (4)
N1—C1	1.405 (3)	C8—H8A	0.9600
N2—C7	1.359 (3)	C8—H8B	0.9600
N2—C6	1.396 (3)	C8—H8C	0.9600
N2—C9	1.451 (3)	C9—H9A	0.9700
N3—N4	1.360 (3)	C9—H9B	0.9700
N3—C10	1.365 (3)	C10—C15	1.388 (4)
N3—C9	1.449 (3)	C10—C11	1.403 (4)
N4—N5	1.290 (4)	C11—C12	1.366 (4)
N5—C15	1.381 (4)	C11—H11	0.9300
C1—C6	1.390 (3)	C12—C13	1.412 (5)
C1—C2	1.393 (4)	C12—H12	0.9300
C2—C3	1.376 (4)	C13—C14	1.366 (5)
C2—H2	0.9300	C13—H13	0.9300
C3—C4	1.395 (4)	C14—C15	1.395 (4)
C3—H3	0.9300	C14—H14	0.9300

N1ⁱ—Zn1—N1	96.95 (12)	C1—C6—N2	105.2 (2)
N1ⁱ—Zn1—Cl1ⁱ	109.86 (6)	N1—C7—N2	111.7 (2)
N1—Zn1—Cl1ⁱ	114.34 (6)	N1—C7—C8	125.9 (2)
N1ⁱ—Zn1—Cl1	114.34 (6)	N2—C7—C8	122.4 (2)
N1—Zn1—Cl1	109.86 (6)	C7—C8—H8A	109.5
Cl1ⁱ—Zn1—Cl1	110.89 (5)	C7—C8—H8B	109.5
C7—N1—C1	106.0 (2)	H8A—C8—H8B	109.5
C7—N1—Zn1	127.62 (17)	C7—C8—H8C	109.5
C1—N1—Zn1	125.50 (16)	H8A—C8—H8C	109.5
C7—N2—C6	107.9 (2)	H8B—C8—H8C	109.5
C7—N2—C9	126.5 (2)	N3—C9—N2	111.0 (2)
C6—N2—C9	125.6 (2)	N3—C9—H9A	109.4
N4—N3—C10	110.1 (2)	N2—C9—H9A	109.4
N4—N3—C9	118.6 (2)	N3—C9—H9B	109.4
C10—N3—C9	131.3 (2)	N2—C9—H9B	109.4
N5—N4—N3	109.2 (2)	H9A—C9—H9B	108.0
N4—N5—C15	108.1 (2)	N3—C10—C15	103.8 (2)
C6—C1—C2	119.9 (2)	N3—C10—C11	134.3 (3)
C6—C1—N1	109.2 (2)	C15—C10—C11	121.9 (3)
C2—C1—N1	130.8 (2)	C12—C11—C10	116.0 (3)
C3—C2—C1	117.6 (3)	C12—C11—H11	122.0
C3—C2—H2	121.2	C10—C11—H11	122.0
C1—C2—H2	121.2	C11—C12—C13	122.7 (3)
C2—C3—C4	121.4 (3)	C11—C12—H12	118.7
C2—C3—H3	119.3	C13—C12—H12	118.7
C4—C3—H3	119.3	C14—C13—C12	120.7 (3)
C5—C4—C3	122.1 (3)	C14—C13—H13	119.6
C5—C4—H4	119.0	C12—C13—H13	119.6
C3—C4—H4	119.0	C13—C14—C15	117.7 (3)
C4—C5—C6	115.8 (3)	C13—C14—H14	121.2
C4—C5—H5	122.1	C15—C14—H14	121.2
C6—C5—H5	122.1	N5—C15—C10	108.9 (2)
C5—C6—C1	123.1 (2)	N5—C15—C14	130.1 (3)
C5—C6—N2	131.7 (2)	C10—C15—C14	121.0 (3)

N1ⁱ—Zn1—N1—C7	−88.2 (2)	Zn1—N1—C7—N2	169.67 (16)
Cl1ⁱ—Zn1—N1—C7	27.3 (2)	C1—N1—C7—C8	178.9 (3)
Cl1—Zn1—N1—C7	152.8 (2)	Zn1—N1—C7—C8	−11.2 (4)
N1ⁱ—Zn1—N1—C1	79.87 (19)	C6—N2—C7—N1	0.2 (3)
Cl1ⁱ—Zn1—N1—C1	−164.61 (17)	C9—N2—C7—N1	−178.6 (2)
Cl1—Zn1—N1—C1	−39.2 (2)	C6—N2—C7—C8	−179.0 (3)
C10—N3—N4—N5	−0.1 (3)	C9—N2—C7—C8	2.2 (4)
C9—N3—N4—N5	180.0 (3)	N4—N3—C9—N2	129.2 (3)
N3—N4—N5—C15	0.4 (4)	C10—N3—C9—N2	−50.8 (4)
C7—N1—C1—C6	0.1 (3)	C7—N2—C9—N3	115.7 (3)
Zn1—N1—C1—C6	−170.04 (15)	C6—N2—C9—N3	−62.9 (3)
C7—N1—C1—C2	−179.1 (3)	N4—N3—C10—C15	−0.3 (3)
Zn1—N1—C1—C2	10.7 (4)	C9—N3—C10—C15	179.7 (3)
C6—C1—C2—C3	0.9 (4)	N4—N3—C10—C11	179.5 (3)
N1—C1—C2—C3	−179.9 (3)	C9—N3—C10—C11	−0.6 (5)
C1—C2—C3—C4	−0.9 (4)	N3—C10—C11—C12	179.7 (3)
C2—C3—C4—C5	0.2 (5)	C15—C10—C11—C12	−0.6 (4)
C3—C4—C5—C6	0.5 (4)	C10—C11—C12—C13	0.1 (4)
C4—C5—C6—C1	−0.5 (4)	C11—C12—C13—C14	−0.2 (5)
C4—C5—C6—N2	−179.9 (3)	C12—C13—C14—C15	0.6 (4)
C2—C1—C6—C5	−0.2 (4)	N4—N5—C15—C10	−0.6 (3)
N1—C1—C6—C5	−179.5 (2)	N4—N5—C15—C14	179.0 (3)
C2—C1—C6—N2	179.4 (2)	N3—C10—C15—N5	0.6 (3)
N1—C1—C6—N2	0.0 (3)	C11—C10—C15—N5	−179.3 (3)
C7—N2—C6—C5	179.3 (3)	N3—C10—C15—C14	−179.1 (3)
C9—N2—C6—C5	−1.8 (4)	C11—C10—C15—C14	1.1 (4)
C7—N2—C6—C1	−0.1 (3)	C13—C14—C15—N5	179.4 (3)
C9—N2—C6—C1	178.7 (2)	C13—C14—C15—C10	−1.0 (4)
C1—N1—C7—N2	−0.2 (3)

Symmetry code: (i) −x, y, −z+1/2.

Experimental details

Crystal data
Chemical formula	[ZnCl₂(C₁₅H₁₃N₅)₂]
M_r	662.90
Crystal system, space group	Monoclinic, C2/c
Temperature (K)	295
a, b, c (Å)	15.721 (4), 12.617 (4), 14.728 (3)
β (°)	99.13 (3)
V (Å³)	2884.3 (13)
Z	4
Radiation type	Mo Kα
µ (mm⁻¹)	1.08
Crystal size (mm)	0.22 × 0.20 × 0.20

Data collection
Diffractometer	Rigaku Saturn CCD diffractometer
Absorption correction	Multi-scan (CrystalClear; Rigaku/MSC, 2006)
T_min, T_max	0.797, 0.813
No. of measured, independent and observed [I > 2σ(I)] reflections	17560, 3423, 2977
R_int	0.041
(sin θ/λ)_max (Å⁻¹)	0.658

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.050, 0.137, 1.07
No. of reflections	3423
No. of parameters	196
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	0.25, −0.30

Computer programs: CrystalClear (Rigaku/MSC, 2006), SHELXS97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008).

Acknowledgements

We gratefully acknowledge financial support by Henan Institute of Education.

References

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