Síntese e caracterização de polímeros de coordenação envolvendo metais da primeira série de transição e ligantes N-e O-doadores

Abstract

This work describes the synthesis and characterization of four coordination polymers identified by the codes CMD01, CMD02, CMD03and CMD04. All compounds containing dicarboxylic ligands classified as O-donorandtwo of them containing also, N-donor ligands along the Cu2+and Co2+metallic centers in order to obtain coordination nets with mixed ligands. The O-donors ligands used were azelaic acid (AcAz), fumaric acid (AcFu) and glutaric acid (AcGl) and the N-donor ligand was hexamethylenetetramine (HMT). The novelcompounds CMD01and CMD04have only dicarboxylic ligands and CMD02and CMD03mixed ligands. Among the available characterization techniques, in which some compounds were characterized, are CHN elementalanalysis, thermal analysis (TG), infrared vibrational spectroscopy(IR), powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction (SCXRD). The obtained polymers do nothave a structural relation withineach other, soit was not possible to compare them. The compounds CMD01, CMD02and CMD03expand three-dimensionally through the dicarboxylic ligands and, in the last two cases, nitrogenous ligands. On the other hand, CMD04is a 1D coordination polymer through its dicarboxyic ligands, possessinga 3Dsupramolecular arrangement extendingthrough OH···O hydrogen bonds. Classical and non-classical hydrogen bonds are present in all compounds. The topological analysis was performed for all compounds, but the simplified topological net was only available for CMD02 andCMD03, with pcu and sqctypes,respectively.More study needsto be done before determiningthe topological net for the others, mainly due to their more complex structures.