Study of copper(II) complexes of two diacetyl monooxime thiosemicarbazones: X-ray crystal structure and magneto-structural correlation of [Cu(dmoTSCH)Cl]2·H2O (dmoTSCH=monoanion of diacetyl monooxime thiosemicarbazone)
摘要:
Cu(II) complexes of the tridentate thiosemicarbazone ligands diacetyl monooxime thiosemicarbazone (dmoTSCH(2)) and diacetyl monooxime (4-phenyl)thiosemicarbazone (dmoPhTSCH(2)) have been synthesized. X-ray crystal structures of dmoPhTSCH(2) and [Cu(dmoTSCH)Cl](2)center dot H2O (1 center dot H2O) are also reported. The Cu(II) compound 1 center dot H2O is a dinuclear complex, where the Cu(II) centers have a square pyramidal geometry and are bridged by two thiolato ligands. A C-2 axis passes through the middle of Cu2S2 rectangle. Variable temperature susceptibility measurement for 1 center dot H2O shows that this compound exhibits a very weak antiferromagnetic behavior (in the solid state) with J(1) = -2.97 cm(-1), using the Heisenberg isotropic spin Hamiltonian (H = -J(1)S(1)center dot S-2). DFT calculations show that the intramolecular magnetic interaction should be ferromagnetic, and the net antiferromagnetic behavior is due to competition with antiferromagnetic intermolecular interactions through hydrogen bonds. (C) 2012 Elsevier Ltd. All rights reserved.