catena-Poly[[dichloridozinc(II)]-μ-1,4-bis­(pyridin-2-ylmeth­oxy)benzene-κ2 N:N′]

Ying Liu; Hong-Sen Zhang; Ming-Xing Hu; Guang-Feng Hou; Jin-Sheng Gao

doi:10.1107/S1600536811035963

. 2011 Sep 14;67(Pt 10):m1373. doi: 10.1107/S1600536811035963

catena-Poly[[dichloridozinc(II)]-μ-1,4-bis(pyridin-2-ylmethoxy)benzene-κ² N:N′]

Ying Liu ^a,^*, Hong-Sen Zhang ^b, Ming-Xing Hu ^a, Guang-Feng Hou ^c, Jin-Sheng Gao ^c

PMCID: PMC3201249 PMID: 22058696

Abstract

In the title compound, [ZnCl₂(C₁₈H₁₆N₂O₂)]_n, the Zn^II ion is tetrahedrally coordinated by two Cl atoms and by two N atoms from different 1,4-bis(pyridin-2-ylmethoxy)benzene ligands. The ligand shows a non-planar configuration, in which the dihedral angles between the two terminal pyridine rings and the linking benzene ring are 7.86 (12) and 70.74 (11)°. The flexible ligand coordinates to the Zn^II ions, generating an infinite chain propagating along [001].

Related literature

For the synthesis and general background to flexible pyridyl-based ligands, see: Wang et al. (2007 ▶); Liu et al. (2010a ▶,b ▶)

Experimental

Crystal data

[ZnCl₂(C₁₈H₁₆N₂O₂)]
M _r = 428.62
Triclinic,
a = 8.8797 (18) Å
b = 10.458 (2) Å
c = 10.561 (2) Å
α = 87.55 (3)°
β = 73.50 (3)°
γ = 72.31 (3)°
V = 894.9 (3) Å³
Z = 2
Mo Kα radiation
μ = 1.69 mm⁻¹
T = 293 K
0.21 × 0.19 × 0.17 mm

Data collection

Rigaku R-AXIS RAPID diffractometer
Absorption correction: multi-scan (ABSCOR; Higashi, 1995 ▶) T _min = 0.719, T _max = 0.760
8755 measured reflections
4028 independent reflections
3222 reflections with I > 2σ(I)
R _int = 0.028

Refinement

R[F ² > 2σ(F ²)] = 0.032
wR(F ²) = 0.073
S = 1.05
4028 reflections
226 parameters
H-atom parameters constrained
Δρ_max = 0.32 e Å⁻³
Δρ_min = −0.29 e Å⁻³

Data collection: RAPID-AUTO (Rigaku, 1998 ▶); cell refinement: RAPID-AUTO; data reduction: CrystalClear (Rigaku/MSC, 2002 ▶); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008 ▶); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008 ▶); molecular graphics: SHELXTL (Sheldrick, 2008 ▶); software used to prepare material for publication: SHELXL97.

Supplementary Material

Crystal structure: contains datablock(s) I, global. DOI: 10.1107/S1600536811035963/fj2447sup1.cif

e-67-m1373-sup1.cif^{(24.7KB, cif)}

Structure factors: contains datablock(s) I. DOI: 10.1107/S1600536811035963/fj2447Isup2.hkl

e-67-m1373-Isup2.hkl^{(197.4KB, hkl)}

Additional supplementary materials: crystallographic information; 3D view; checkCIF report

Acknowledgments

The authors thank the Educational Commission of Heilongjiang Province of China (project No. 12511472), Heilongjiang Institute of Technology and Heilongjiang University for supporting this work.

supplementary crystallographic information

Comment

The metal-organic frameworks are determined by many factors, in which the organic ligands as building blocks and the kinds of metal ions are most important. Many pyridyl-containing ligands with strong coordination ability and functional characteristics have been studied over the recent years (Wang et al., 2007). The flexible bipyridyl ligands could react with transitional metals to construct the helical-like structures. Recently, as a continuration of previous works (Liu et al., 2010a, b), we report the crystal structure of the title compound here.

In the title compound, [(ZnCl₂)(C₁₈H₁₆N₂O₂)]_n, each Zn^II atom is four-coordinated by two Cl atoms and two N atoms from different 1,4-bis(pyridin-2-ylmethoxy)benzene ligands to form a distorted tetrahedral geometry configuration. The Zn-Cl bond lengths are 2.228 (1) and 2.253 (1) Å, and Zn-N bond lengths are 2.090 (2) and 2.080 (2) Å. The Cl(1)-Zn-Cl(2) bond angle (110.45 °) and the N(1)-Zn-N(2) bond angle (111.03 °) are nearly equal to 120 ° in order to minimize the steric hindrance (Fig. 1, Table 1).

The ligand is oriented in a divergent fashion, in which the dihedral angles between two terminal pyridine rings with the linking benzene ring are 7.86 (12) and 70.74 (11)°. In the crystal packing, the flexible ligands link the Zn^II atoms to generate an infinite chain running along [001].

Experimental

The 1,4-bis(pyridin-2-ylmethoxy)benzene ligand was synthesized as the reference method (Liu et al., 2010a,b). The title compound was produced by reaction of ZnCl₂ (0.50 mmol,0.068 g) in water (5 mL) and 1,4-bis(pyridin-2-ylmethoxy)benzene (0.5 mmol, 0.146 g) in 5 mL methanol under constant stirring, and filtered after stirring for about one hour. The filtate was maintained for about one week under the room temperature to give colorless block-like crystals suitable for X-ray analysis.