Infrared Spectra and Normal Coordinate Analysis of Metal Glycino Complexes

The infrared spectra of bis(glycino) complexes of Pt II, Pd II, Cu II, and Ni II have been measured from 4000 to 250 cm−1. For cis-bis(glycino) Cu II monohydrate, the spectra have been obtained including its three deutero analogs. Normal coordinate analyses have been carried out on all these complexes using the 1:1 (metal/ligand) approximation. The results indicate that the metal—nitrogen stretching bands are located between 550 and 430 cm−1 and the metal—oxygen stretching bands are between 420 and 290 cm−1. The metal—nitrogen and metal—oxygen stretching force constants have the same value for each metal studied, and are 2.10, 2.00, 0.90, and 0.70 mdyn/Å for Pt II, Pd II, Cu II, and Ni II, respectively.