Abstract
AbstractThe phenoxo‐bridged dinuclear CuII complex [Cu2L2(NCNCN)2] (1) and the dicyanamide‐bridged molecular rectangle [Cu4L4{μ1,5‐(NCNCN)2}]·(ClO4)2(H2O)2 (2) were synthesized using the tridentate reduced Schiff‐base ligand HL {2‐[(2‐dimethylamino‐ethylamino)methyl]phenol}. The complexes were characterized by X‐ray structural analyses and variable‐temperature magnetic susceptibility measurements. Complex 2 was formed through the joining of the phenoxo‐bridged dinuclear Cu2O2 cores of 1 via the μ1,5‐bridging mode of dicyanamide. The structural properties of the Cu2O2 cores in two complexes are significantly different. The geometry of the copper ions is distorted trigonal bipyramid in 1 but is nearly square‐pyramidal in 2. These differences have a marked effect on the magnetic properties of two compounds. Although both are antiferromagnetically coupled, the coupling constants (J = –185.2 and –500.9 cm–1 for 1 and 2, respectively) differ considerably.
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