Nitric oxide reactivity of copper(II) complexes of bidentate amine ligands (original) (raw)

Two copper(II) complexes, 1 and 2 with L1 and L2 [L1 = propane-1,3-diamine; L2 = N-isopropylpropane- 1,3-diamine], respectively, were synthesized and characterized structurally. In acetonitrile solution of the complexes, the Cu(II) centre was found to reduce in presence of nitric oxide gas. The formation of [CuII–NO] intermediate prior to the reduction of Cu(II) center was evidenced by UV–Vis, solution FT-IR, X-band EPR studies. This reduction led to the ligand transformation through diazotization at primary amine site in complex 1; whereas, N-nitrosation at the secondary amine site of the ligand was observed in 2. The final organic products were isolated and characterized by spectroscopic studies.

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