A nonanuclear copper(II) cluster incorporating endogenous alkoxo- and exogenous hydroxo bridges containing [Cu-3(mu(3)-OH)] cores

作者：Khanra Sumit; Weyhermueller Thomas; Chaudhuri Phalguni^*

来源：Dalton Transactions, 2009, (19): 3847-3853.

DOI：10.1039/b900711c

A remarkable nonanuclear copper(II) complex, 1, with the composition [Cu-9(L)(4)(mu(3)-OH)(4)(MeOH)(2)] (ClO4)(2), in which L is a pentadentate trianionic Schiff-base ligand with N2O3 donor atoms, has been characterized by analytical, structural and magnetochemical methods. The structure consists of four dinuclear [Cu2L]( ) units linked covalently to a central copper atom by four mu(3)-OH, thus yielding the nonacopper core. Variable-temperature (2-290 K) magnetic susceptibility data of 1, have been analyzed by a "three-J" exchange coupling model (H = -2J (S) over cap (i)center dot(S) over cap (j)), with the simulated coupling constants J'(1) = -189.1 cm(-1), J'(2) = -22.7 cm(-1), J'(3) = -45.7 cm(-1). A rationale for the different strength of antiferromagnetic interactions based on a comparison with those reported in the literature is forwarded.

• 出版日期2009