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

Three new tripod tetradentate phenolate-amines ( H 2 L 1 , H 2 L 4 and H 2 L 9 ), together with seven more already related published ligands, were synthesized, and characterized. With these ligands, two new dinuclear doubly-bridged-phenoxido copper(II) complexes ( 3 , 4 ), and six more complexes ( 1 , 2 , 5 - 8 ), a new trinuclear complex ( 9 ) with an alternative doubly-bridged-phenoxido and -methoxido, as well as the 1D polymer ( 10 ) 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 1 - 4 , mixed square pyramidal and square planar in 5 , 6 , and 9 , and distorted octahedral (5+1) arrangements in 7 and 8 . The temperature dependence magnetic susceptibility study over the temperature range 2-300 K revealed moderate-relatively strong antiferromagnetic coupling (AF) (| J | = 289-145 cm -1 ) in complexes 1 - 6 , weak-moderate AF (| J | = 59 cm -1 ) in the trinuclear complex 9 , but weak AF interactions (| J | = 3.6 & 4.6 cm -1 ) were obtained in 7 and 8 . No correlation was found between the exchange coupling J and the geometrical structural parameters of the four-membered Cu 2 O 2 rings.