Two new oxamido-bridged trinuclear complexes [Cu2M] (M = Mn(II), Co(II)): synthesis, structures, and magnetic properties

Abstract

By using the macrocyclic oxamido-copper complex CuL (H 2 L = 2,3-dioxo-5,6:13,14-dibenzo-9,10-(O)cyclohexyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene) as precursor, two new trinuclear complexes with the formulas [(CuL) 2 Mn(ClO 4 ) 2 ] (1) and [(CuL) 2 Co(ClO 4 ) 2 ] (2) have been synthesized and structurally characterized. H-bonds are found between the molecules, which link adjacent trinuclear units together to form a unique onedimensional structure. The temperature dependence of the magnetic susceptibility for the complexes was analyzed by means of the HamiltonianĤ ¼ À2JŜ 1Ŝ2 ; leading to J = -14.66 cm -1 and J = -22.9 cm -1 for 1 and 2, respectively.

Interplay of thermochemistry and Structural Chemistry, the journal (volume 19, 2008) and the discipline

“…Zhang et al [163] report the syntheses, structures and magnetic properties of two new oxamido-bridged trinuclear complexes [(CuL) 2 Mn(ClO 4 ) 2 ] and [(CuL) 2 Co (ClO 4 ) 2 ] by using the macrocyclic ligand oxamido-copper complex as the precursor (where H 2 L = 2,3-dioxo-5,6:13,14-dibenzo-9,10-(O)cyclohexyl-1,4,8,11-tetraazacyclo-tetradeca-7,12-diene). It would be interesting to compare the enthalpies of these complexes with their less symmetric isomers such as (CuL)(MnL)Cu(ClO 4 ) 2 .…”