EVOLUŢIA DE LA COMPUŞII MONO- SPRE POLINUCLEARI ÎN BAZA UNOR LIGANZI MONOXIMICI

Eduard COROPCEANU Institutul de Chimie al AŞM

Abstract

EVOLUTION FROM MONO- TO POLYNUCLEAR COMPOUNDS ON THE BASIS OF SOME MONOXIME LIGANDS

There was performed the synthesis of a series of coordination compounds with monoxime ligands, in which there was observed the evolution from the mononuclear compounds to those with polymer structure. As monoxime ligands there was used 2- and 4-pyridinealdoximes. As bridge-ligands there was used sulfate, acetate, malonate, succinate, adipate, terephthalate anion etc. The use of 2-pyridinealdoxime ligand creates premises for the location of these molecules in complex with cis position, a fact which determines the formation of polymer chains in zig-zag form. The specific of each dicarboxylic acid, its ability to coordinate, decisively influences the molecular structure of the assembled polymers. Due to their ability of manifesting a higher coordination number, cadmium ions often offer the possibility of assembling some polymer architectures more complicated than those of zinc. Keywords: coordination compounds, monoxime, assembly, polymer, molecular architecture.