Acta Crystallographica Section C

Crystal Structure Communications

Volume 69, Part 5 (May 2013)

metal-organic compounds

Acta Cryst. (2013). C69, 471-475    [ doi:10.1107/S0108270113007075 ]

Binuclear and chain-structure zinc(II) complexes constructed from 3,4-di­meth­oxy-trans-cinnamic acid and N-donor coligands 4-(1H-pyrazol-3-yl)pyridine and 4,4'-bipyridine

Y.-L. Wang, Z.-J. Shao and S.-S. Qian

Abstract: 3,4-Dimeth­oxy-trans-cinnamic acid (Dmca) reacts with zinc sulfate in the presence of 4-(1H-pyrazol-3-yl)pyridine (L1) or 4,4'-bipyridine (L2) under hydro­thermal conditions to afford two mixed-ligand coordination complexes, namely tetra­kis­([mu]-3,4-dimeth­oxy-trans-cinnamato-[kappa]2O:O')bis­[[4-(1H-pyrazol-3-yl)pyridine]­zinc(II)] hepta­hydrate, [Zn2(C11H11O4)4(C8H7N3)2]·7H2O or [Zn2(Dmca)4(L1)2]·7H2O, (I), and catena-poly[[bis­(3,4-dimeth­oxy-trans-cinnamato-[kappa]O)zinc(II)]-[mu]-4,4'-bipyridine-[kappa]2N:N'], [Zn(C11H11O4)2(C10H8N2)]n or [Zn(Dmca)2(L2)]n, (II). The ZnII centres in the two compounds display different coordination polyhedra. In complex (I), the ZnII cation is five-coordinated with a pseudo-square-pyramidal geometry, while in complex (II) the ZnII cation sits on a twofold axis and adopts a distorted tetra­hedral coordination environment. Complex (I) features a centrosymmetric binuclear paddle-wheel-like structure, while complex (II) shows a chain structure. This study emphasizes the significant effect of the coordination mode of both carboxyl­ate-group and N-donor coligands on the formation of complex structures.

Formula: [Zn2(C11H11O4)4(C8H7N3)2]·7H2O and [Zn(C11H11O4)2(C10H8N2)]

hkldisplay filedownload file

Structure factor file (CIF format) (300.2 kbytes)
[ doi:10.1107/S0108270113007075/dt3018Isup2.hkl ]
Contains datablock I

hkldisplay filedownload file

Structure factor file (CIF format) (137.8 kbytes)
[ doi:10.1107/S0108270113007075/dt3018IIsup3.hkl ]
Contains datablock II


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