SYNTHESIS AND PROPERTIES OF DINUCLEAR COPPER(II) COMPLEXES CONTAINING DINUCLEATING LIGANDS WITH IMIDAZOLE NITROGEN AND TWO EXOGENOUS BRIDGING LIGANDS

Dinuclear copper(II) complexes, [Cu2(nR)X2] (ClO4)2 (X = N3−, NCS−, and OAc−) have been synthesized and characterized, where nR = N,N,N′,N′-tetrakis[(1-methyl-2-benzimidazolyl)methyl]-1,3-diaminopropane (3Me), N,N,N′,N′-tetrakis[(1-ethyl-2-benzimidazolyl)methyl]-1,3-diaminopropane (3Et), N,N,N′,N′-tetrakis[(1-methyl-2-benzimidazolyl)methyl]-1,4-diaminobutane (4Me), and N,N,N′,N′-tetrakis[(1-ethyl-2-benzimidazolyl)methyl]-1,4-diaminobutane (4Et). Although a weak antiferromagnetic interactions were found for [Cu2(3Me)(NCS)2](ClO4)2·3H2O (coupling constant J = −2.1 cm−1, H = −2JS1·S2) and [Cu2(3Me)(OAc)2](ClO4)2·H2O (J = −2.0 cm−1), no exchange interaction has been observed to 4.2 K for [Cu2(3Me)(N3)2](ClO4)2·H2O. The Electrochemistry of these complexes in N,N-dimethylformamide showed two electron reductions at +210 — −30 mV vs. Ag–AgCl (Cu2+–Cu2+ → Cu+–Cu+).

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