Self assembly towards the construction of molecular ladder and rectangular grid of cadmium(II)-selenocyanate

摘要

Two novel polymeric networks of cadmium(II), [Cd-2(ibn)(SeCN)(4)](n) (1) (ibn = 1,2-diamino-2-methylpropane) and [Cd(pyz)(SeCN)(2)](n) (2) (pyz = pyrazine) have been synthesised and their molecular structures have been determined by X-ray crystallography. The polymer 1 consists of two 1D parallel chains of Cd(II), each having alternate tetrahedral (CdSe4) and octahedral (UNO Cd(II) centres bridged through selenocyanate, exhibiting symbiotic phenomena. The octahedral Cd(II) centre of one chain is linked with the tetrahedral Cd(II) centre of another chain through selenocyanate ligand resulting ID ladder like structure. The complex 2 is a 2D network of octahedral Cd(II) (CdN4Se2) in which doubly selenocyanato bridged ID coordination polymeric chains are linked through pyrazine ligand in a bc plane forming rectangular grid like structure. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 40]