Dynamic Motion in [HFe(CO₄)ˉ] Ions as Observed by Mössbauer Spectroscopy - Evidence for Hydride “tunneling”

Author

Gary J. Long, Missouri University of Science and TechnologyFollow
Fernande Grandjean, Missouri University of Science and TechnologyFollow
Kenton H. Whitmire

Abstract

The iron atom is moved by up to 0.34 Å from its original position in the anion [HFe(CO₄)^-] when the temperature is increased. This is suggested by the results of Mössbauer spectroscopy at temperatures from 78 to 280 K on a series of ammonium salts with this anion. The displacement is induced by a movement of the ligands and is in accord with a rapid change of position (“tunneling”) of the hydrido ligands, which makes the four carbonyl ligands equivalent. The Gibbs free energy of activation for the tunneling, determined from the temperature dependence of the displacement of the iron atom, is 29.2 kJ mol^-1 for the Et₄N⁺ salt and only 9.7 kJ mol^-1 for the Me₄N⁺ salt.

Recommended Citation

G. J. Long et al., "Dynamic Motion in [HFe(CO₄)ˉ] Ions as Observed by Mössbauer Spectroscopy - Evidence for Hydride “tunneling”," Angewandte Chemie International Edition, vol. 31, no. 7, pp. 884 - 886, Wiley-VCH Verlag, Jul 1992.

The definitive version is available at https://doi.org/10.1002/anie.199208841

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0570-0833

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1992 Wiley-VCH Verlag, All rights reserved.

Publication Date

01 Jul 1992