Far infrared spectra (500–50 cm⁻¹) of the 2,2′-bipyridine complexes of palladium and platinum halides

Summary

The far-i.r. spectra of the title complexes have been examined. Band assignments are based on the shifts induced by ligand deuteration and halide substitution. Deuteration of bipyridine causes large shifts (Δν >10 cm⁻¹) in internal ligand modes, intermediate shifts Δν between 2 and 9 cm⁻¹) in metal-nitrogen stretching and bending modes and small to zero shifts in metal-halide stretching and bending vibrations. Generally, the requirements for square planarC _2v synanetry [two ν(M−N) and two ν(M−X) bands] are observed. Previous ambiguities in the assignment of the ν(M−N) bands have been resolved by the isotopic labelling technique employed in this study.