SYNTHESES AND MAGNETIC-PROPERTIES OF IMIDAZOLATE-BRIDGED BINUCLEAR COPPER(II) COMPLEXES - EFFECT OF BRIDGING MODE UPON MAGNETIC INTERACTION

Three imidazolate-bridged binuclear copper(II) complexes [Cu(A)Cu(L(n))]ClO4, 1 (n=1), 2 (n=2), and 3 (n=3), have been prepared and characterized, where H2A=4-(6-methyl-8-hydroxy-2,5-diazanonane-1,5,7-trienyl)-imidazole, HL1=N-salicylidene-2-(2-pyridyl)ethylamine, HL2=N-(1-methyl-3-oxobutylidene)-2-(2-pyridyl)ethylamine, and HL3=3,3'-(trimethylenedinitrilo)-bis[2-butanone oximate]. The cryo-magnetic susceptibility data (4.2-300 K) of 1 and 2 were well reproduced by the Bleaney-Bowers equation based on H=-2JS(Cu) . S(Cu) with the J values of -46.1 and -36.6 cm-1, respectively, while the magnetic data of 3 showed no magnetic interaction. The reference complexes [Cu(L(n))(py)]ClO4 (n=1,2; py=pyridine) have been subjected to single-crystal X-ray diffraction analysis.