Spectroscopic characterization for the geometrical isomers of azido-amine-cobalt(III) complexes

Abstract

A series of pseudo octahedral monoazido-, diazido- and triazido-amine-cobalt(III) complexes was synthesized. The IR spectra for the CH 2 rocking in the range 800–900 cm −1 was used to distinguish between the geometrical configuration of the complexes. The asymmetric stretching mode of vibration of the coordinated azide, ν a(N 3) in the range 2000–2065 cm −1 was employed to confirm the previous prediction ; the cis-diazido and fac-triazido species exhibit two strong absorption bands, whereas their corresponding trans and mer complexes show only one band. The 13C NMR spectra of the complexes in (CD 3)SO were in complete agreement with the assigned geometry. The UV-vis spectra of the synthesized compounds are also reported.