Synthesis, crystal structure and magnetic properties of a novel cross-net-shaped metal la macrocycle [Mn10IIIMn4II(L)8(HL)2(H2O)2(CH3OH)14]•8H2O•8CH3OH

A novel cross-net-shaped metal lamacrocycle, [(Mn10Mn4II)-Mn-III(L)(8)(HL)(2)(H2O)(2)(CH3OH)(14)]center dot 8H(2)O center dot 8CH(3)OH (H4L = (Z)-3-(salicylhydrazinocarbonyl) propenoic acid), has been prepared and characterized. The crystal structure contains seven crystallographically unique manganese ions, in which two opening 13-membered metallacrown rings and two strands, Mn-N-N-Mn, are bridged by eight p-maleoyl groups. The high nuclearity of the molecule shows large magnetic moments, with the value of mu(eff) at 300 K is 19.01 VB. (c) 2008 Elsevier B.V. All rights reserved.