Synthesis, Characterization and Crystal Structures of Mixed-Ligand Complexes of [Cu(bipy) 2 N 3 (ClO 4 )] and [Cu(5,5’-DiMebipy) 2 (N 3 )](ClO 4 )

Two mixed –ligand complexes [Cu(bipy) 2 N 3 (ClO 4 )] and [Cu(5,5’-DiMebipy) 2 (N 3 )](ClO 4 ) have been prepared and characterized. The compounds were characterized by elemental analyses, IR and UV-Visible spectroscopy, room temperature magnetic susceptibility measurements, and conductivity measurement, while the solid-state structures have been established by single-crystal X-ray diffraction analyses. [Cu(bipy) 2 N 3 (ClO 4 )]crystallizes in the monoclinic space group P2 1 /c with cell constants a = 16.9027(3) A, b = 7.59087(9) A, c = 17.2614(3) A, β = 111.2808(19)° and Z = 4. [Cu(5,5’-DiMebipy) 2 (N 3 )](ClO 4 ) also crystallizes in the monoclinic space group P2 1 /c with the cell constants a = 16.0312(11) A, b = 7.9889(5) A, c = 20.7167(18) A, β = 110.285(8)° and Z = 4. The UV-Vis spectra and X-ray determination indicate that [Cu(bipy) 2 N 3 (OClO 3 )] is distorted octahedral ligand field and non-electrolyte in nature while [Cu(5,5’-DiMebipy) 2 (N 3 )](ClO 4 ) is a square pyramidal five coordinate complex and a 1:1 electrolyte. The magnetic moments of the two complexes in the range 1.78–1.83 B.M. reveal a single unpaired electron with a slight orbital contribution.