Three trinuclear Cu–M–Cu (M=Co, Ni and Zn) complexes including macrocyclic oxamido bridge: Synthesis, structures and magnetic properties
摘要:
Based on the complex ligand (CuL H2L=2,3-dioxo-5,6:15,16-dibenzo-1,4,8,13-tetraazacyclotetradeca-7,13-diene), which includes macrocyclic oxamido bridge, three trinuclear complexes were prepared. They are of the formula [(CuL)(2)M(ClO4)(2)] (M = Co(1), Ni(2)) and [(CuL)(2)Zn(CH3OH)(2)]. (ClO4)(2) (3). The crystal structures of the three complexes have been determined and the M(H) of the three complexes all exist on the mirror plane. Complex 1 is the first Cu-Co complex bridged by oxamido. Their magnetic properties were studied by susceptibility versus temperature measurement, the best fitting of the experimental data led to J = -28.12 cm(-1) for 1, J = -42.88 cm(-1) for 2, and J = -2.13 cm(-1) for 3. (c) 2005 Elsevier B.V. All rights reserved.