Syntheses and Magnetic Properties of Imidazolate-Bridged Binuclear Copper(II) Complexes: Effect of Bridging Mode upon Magnetic Interaction

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Abstract
Three imidazolate-bridged binuclear copper(II) complexes [Cu(A)Cu(Ln)]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 = −2JSCu · SCu 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(Ln)(py)]ClO4 (n = 1,2; py = pyridine) have been subjected to single-crystal X-ray diffraction analysis.

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