Cyanide and imidazolate bridged macrocyclic dinuclear CuII complexes: Synthesis, structure and magnetic properties

Reaction of [Cu2L](ClO4)4 with CH3CN in acetonitrile, and Him in DMF gave cyanide and imidazolate bridged macrocyclic dinuclear copper (II) complexes with the formula [Cu2L(CN)](ClO4)3 (1) and [Cu2L(im)](ClO4)2 · 0.7Br · 0.3Cl, (2), respectively (L = N[(CH2)2NHCH2(C6H4-p)CH2NH(CH2)2]3N). In 2, each Cu(II) atom is coordinated with four macrocyclic nitrogen atoms and one imidazolate N atom, forming a slightly distorted square pyramidal geometry. Magnetic susceptibility measurements of 1 and 2 show that the two Cu(II) atoms of the binuclear unit are antiferromagnetically coupled with g = 2.148, J = −86.09 cm−1 for 1, and g = 2.047, J = −38.20 cm−1 for 2. The correlation between the structures and the J values is discussed.