SPECTRAL AND MAGNETIC PROPERTIES OF COPPER(II) NIFLUMATE COMPOUNDS WITH HETEROCYCLIC N-DONOR LIGAND

Abstract

Copper(II) niflumates (nif) with heterocyclic N-donor ligands (L) have been synthesized and characterized by elemental analysis, IR, electronic and EPR spectroscopy. A dimeric structure is proposed for Cu(nif)2nic, similar to that of Cu(CH3COO)2 H2O. For Cu(nif)2L2, (where L = nia, Et2nia or caf) a pseudo-octahedral environment about the copper(II) atom is proposed, in which both nif and L groups participate. For Cu(nif)2(2, 6-dmpy)2 an earlier x-ray structure indicated a non-centrosymmetric structure with uncoordinated niflumate anions. In the present work substantial differences between this complex and the other three complexes are observed.