Hydrothermal Synthesis, Crystal structure of Two-Dimensional Colbalt(II) and Nickel(II) Complexes with 4,4'-Bipyridine

Department of Chemistry, Kasetsart University
â—‹Tanwawan Duangthongyou Sutatip Siripaisarnpipat

iLLuSioNSKTwo coordinaton polymers, 4,4'-bipyridine complexes of cobalt (1) and nickel (2) have been synthesized by hydrothermal reactions. Complex 1 crystallizes in monoclinic system with space group C2 and complex 2 crystallizes in triclinic system with space group P1. In complex 1, the 4,4'-bipyridine ligands bridge between cobalt atoms constructing a motif of 1-D polymeric chain. Each 1-D polymeric chain attracts each other through an intermolecular hydrogen bond between water and 4,4'-bipyridine forming layers. Two uncoordinated 4,4'-bipyridine molecules are between these layers. The crystal structure of complex 2 consists of two polymeric cationic chains of [Ni(4,4'-bpy)] n2+ which connect to each other through another bidentate 4,4'-bipyridine forming a square of composition [Ni(μ-4,4'-bpy) 4]n. Consequently, the ladder type polymeric chain is obtained. Two uncoordinated 4,4'-bipyridine molecules are clathrated in the square cavities.