Electronic and vibrational IR MCD in the Creutz-Taube complex

Abstract

The Creutz-Taube complex was analysed in terms of a simple electronic coupling model and predictions of electronic transitions in the mid-IR (1800-4000 cm-1) were made. Low-temperature MCD measurements in this region show broad features around 2000 and 4000 cm-1 and sharp features near 3200 and 4800 cm-1. Deuteration of the ammine protons indicates that the sharper features are vibrational MCD of anomalous intensity and the broader features are electronic with substantial vibronically induced intensity in the 4000 cm-1 region. Measurements were made by incorporating the complex in a modified PTFE (nafion) film. Thin nafion films are transparent throughout the near- and mid-IR regions and are optically isotropic and transparent. The spectra appear to be the first C-term IR MCD spectra. Show more