Abstract
A new polymeric phase of zinc(II) oxydiacetate, catena-poly[[[diaquazinc(II)]-mu-oxydiacetato] hydrate], [[Zn(C(4)H(4)O(5))(H(2)O)(2)].H(2)O](n), isomorphous with the Co homologue [Hatfield, Helms, Rohrs, Singh, Wasson & Weller (1987). Proc. Indian Acad. Sci. Chem. Sci. 98, 23-31], is reported. It presents a chain-like structure, generated by ZnO(6) cores which are bridged by carboxylate groups in an anti-anti conformation along the unique crystallographic b axis. The chains are held together through hydrogen-bonding interactions with the three water molecules.
Highlights
The interactions of the ZnII ion with carboxylic acids are the subject of extensive research, due to the role of Zn± carboxylate bonds in the active sites of a variety of metalloenzymes and in precursor systems for Zn-containing ceramic materials
1977a,b,c), with discrete units, chains and layers containing CdO7 cores. We report here another polymeric phase of ZnII
Because of the lack of ligand ®eld stabilization energy, the ZnII cation exhibits no preferential coordination numbers and the actual coordination polyhedra are mainly determined by electrostatic forces and the steric effects of the ligands (Prince, 1987)
Summary
1977a,b,c), with discrete units, chains and layers containing CdO7 cores We report here another polymeric phase of ZnII oxydiacetate, formulated as {[Zn(oda)(H2O)2]ÁH2O}n, (I), and compare it with (II). It presents a chain-like structure, generated by ZnO6 cores which are bridged by carboxylate groups in an anti±anti conformation along the unique crystallographic b axis. The environment of the Zn atom in (I) consists of a distorted octahedron, with the basal plane de®ned by atoms O1, O3 and O5 of the tridentate oda ligand, and atom O2 from an outer carboxylate group of a neighbouring oda ligand The latter serves as the link in the resulting one-dimensional polymer formed along the unique crystallographic b axis (Fig. 1). In form (I), adjacent ZnO6 coordination polyhedra bridged by carboxylate groups in an anti±anti conformation de®ne linear arrays along b, with ZnÁ Á ÁZn nearest-neighbour distances of 5.009 (1) AÊ within the chains [5.041 (1) AÊ in the homologous Co compound].
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