Metal Isotope Effects on the Vibrational Spectra of Polymeric Metal Complexes. I. Infrared Spectra of [Bis (L-asparaginato) copper (II)]_n

Abstract

The infrared spectra of [bis-(L-asparaginato) copper (II)] n and its isotopic complexes containing copper and hydrogen isotopes have been measured in the region between 4000 and 200 cm^-1. By referring to the isotope shifts on ⁶³Cu and ⁶⁵Cu substitution, two bands at 359 and 318 cm^-1 have been assigned to metal-ligand stretching vibrations. The frequency shifts on N, N'-deuteration revealed that the Cu-N stretching frequency is larger than the Cu-O stretching frequency.