Acta Cryst. (2013). C69, 471-475 [ doi:10.1107/S0108270113007075 ]
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(-3,4-dimethoxy-trans-cinnamato-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-O)zinc(II)]--4,4'-bipyridine-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)]
Structure factor file (CIF format) (300.2 kbytes)
Structure factor file (CIF format) (137.8 kbytes)
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