Vibrational spectroscopy at high pressures. The crystal structure of Re(CO)5I, the vibrational spectra of the manganese and rhenium pentacarbonyl chlorides and iodides, and their behaviour under high pressure
- 1 January 1991
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 87 (12) , 1831-1836
- https://doi.org/10.1039/ft9918701831
Abstract
The crystal structure of Re(CO)5I has been determined. The unit-cell symmetry is Cmcm, Z= 4, and differs from the Pnma symmetry of the corresponding chloride and bromide. Low-temperature far-IR and Raman data are reported for M(CO)5X, (M = Mn, Re; X = Cl, I), and assigned by reference to the established assignments of the bromides. Neither Re(CO)5Br nor Re(CO)5I shows a phase change upon compression to 43 kbar, but all the modes harden with increase of pressure. A pressure-induced crossover between A1, ν6, ν(Re—I) and E, ν20, δ(CReC) was observed and helps to confirm that part of the assignment.Keywords
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