Magnetostructural Properties of Some Doubly-Bridged Phenoxido Copper(II) Complexes

Three new tripod tetradentate phenolate-amines ( , and ), together with seven more already related published ligands, were synthesized, and characterized. With these ligands, two new dinuclear doubly-bridged-phenoxido copper(II) complexes ( , ), and six more complexes ( , , - ), a new trinuclear complex ( ) with an alternative doubly-bridged-phenoxido and -methoxido, as well as the 1D polymer ( ) were synthesized, and their molecular structures were characterized by spectroscopic methods and X-ray single crystal crystallography. The Cu(II) centers in these complexes exhibit distorted square-pyramidal arrangement in - , mixed square pyramidal and square planar in , , and , and distorted octahedral (5+1) arrangements in and . The temperature dependence magnetic susceptibility study over the temperature range 2-300 K revealed moderate-relatively strong antiferromagnetic coupling (AF) (| | = 289-145 cm ) in complexes - , weak-moderate AF (| | = 59 cm ) in the trinuclear complex , but weak AF interactions (| | = 3.6 & 4.6 cm ) were obtained in and . No correlation was found between the exchange coupling and the geometrical structural parameters of the four-membered Cu O rings.