Synthesis and Properties of Copper(II)-Lanthanide(III) Complexes of a Dinucleating Ligand, N,N'-Bis(3-Hydroxymethyl-5-Methylsalicylidene)Ethylenediamine

Abstract

Copper(II)-lanthanide(III) complexes, CuLn(hmsalen)(NO₃)(H₂O)_n, of a compartmental ligand, N,N'-bis(3-hydroxymethyl-5-methylsalicylidene)ethylenediamine (H₄hmsalen), were synthesized, and their magnetic and spectral properties were investigated. The d-d band absorption spectra suggested the specific interaction of a heterometal center with amino alcohols. In other words, amino nitrogen and alcoholic oxygen interact with the copper site and the lanthanide site, respectively. Cryomagnetic measurements implied very weak magnetic interaction between Cu(II) and Gd(III) ions. The fluorescence of Eu(III) in the Cu(II)-Eu(III) complex is much weaker, compared with that of a simple salt such as europium(III) nitrate.