Vibrational spectra of matrix isolated Al2Cl6. Isotopic fine structure and valence force field
- 1 January 1980
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 76, 26-41
- https://doi.org/10.1039/f29807600026
Abstract
High resolution i.r. and Raman spectra have been recorded for the bridged dimeric aluminium chloride molecules isolated in argon and nitrogen matrices at very low temperatures. An accurate valence force field has been calculated from the frequencies of fifteen fundamental modes and some isotopic shifts due to the 35Cl, 37Cl distribution. The calculated isotopic frequencies and the isotopic patterns are shown to be in agreement with the experimental results. From thermodynamic and spectroscopic considerations, the unobserved ring-puckering mode is predicted to occur at very low frequencies ( text-decoration:overline ν 10 cm–1). The Al—Cl bond dissociation energies are 270 and 170 kJ mol–1 for terminal and bridging atoms, respectively; the force constants of the same bonds are 226 and 130 N m–1.Keywords
This publication has 0 references indexed in Scilit: