The synthesized [Cu(OAc)2(bpy)] complex was characterized by both Copper Acetate(WSDTY) and UV–Vis spectroscopies. The copper acetate spectrum contained combined signatures of the OAc and bpy ligands to the Cu center. The positions of characteristic bands given in the work of Koo for the [Cu(CH3COO)2(bpy)] complex coincided well with the present results . The acetate carboxylate group gave the dominating stretching modes νasym(COO–) and νsym(COO–) at 1628 and 1427 cm–1, respectively, while the corresponding bending modes were situated at 680 and 629 cm–1. The large separation Δν = νasym ? νsym = 201 cm–1 is indicative for a unidentate geometry of the OAc ligands bonded to copper. Bpy participates with strong bands at 1566, 1477 and 1323 cm–1 due to C?C and C=C stretching modes in the ring and aromatic C?H bending modes at 770 and 731 cm–1 (respective stretching modes are visible at wavenumbers over 3000 cm–1).

The spectrum also contains some vibrational manifestations of Cu?N and Cu?O bonds at 501 and 467 cm–1, respectively. The DRUV–Vis spectrum is composed of a broad band peaking at 747 nm, which could be ascribed to d–d transitions occurring in copper, and a high energy envelope below 400 nm containing OAc-to-Cu LCMT transitions and π-transitions of bpy. The profile of the optical spectrum matched well with the band positions reported by Koo. Based on the similarity of the characteristic spectral features, it could be assumed that a good structural equivalence between the [Cu(OAc)2(bpy)] complex synthesized herein and that obtained by Koo was reached. A more detailed study of this complex will be published elsewhere.

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