A rare ferromagnetic manganese(III) hexanuclear cluster
摘要:
The reaction of salicylaldoxime (H(2)sao) with Mn(ClO(4))(2)center dot 6H(2)O, sodium 3,5-dinitrobenzoate and NEt(4)(OH) in MeOH/EtOH affords a Mn(III) hexanuclear compound [Mn(6)O(2)(sao)(6)(ArCO(2))(2)(MeOH)(2)(EtOH)(2)(H(2)O)(2)] (ArCO(2)H= 3,5-dinitrobenzoic acid) (1). 1 contains [Mn(6)(III)(mu(3)-O)(2)](14+) core, with a known structural type in the family of Mn(6) clusters. Temperature-dependent magnetic susceptibility study shows presence of predominant ferromagnetic interactions between Mn(III) ions. Alternating current (ac) susceptibility measurements reveal a frequency-dependent out-of-phase (chi(M)) signal below 4 K. suggesting 1 to be a single-molecule magnet (SMM). (C) 2010 Elsevier B.V. All rights reserved.