The C–O stretching vibrations and force constants of phosphine- and arsine-substituted cobalt carbonyl complexes [LCo(CO)3]2and [LCo(CO)3]2Hg complexes
- 1 January 1970
- journal article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 3352-3356
- https://doi.org/10.1039/j19700003352
Abstract
The i.r. spectra of [LCo(CO)3]2 and [{LCo(CO)3}2Hg] complexes (L = R3P, R3= Et3,Bun 3, and PhEt2; L = R3As, R3= Et3,Bun 3, PhEt2, Ph2H, and Ph2Me) have been investigated in the 1800–2050 and 3800–4100 cm–1 regions and absorption bands due to ν(CO) fundamental and binary combination vibrations are identified and assigned. The frequencies of the former are used to calculate force constants on a non-rigorous model, and these in turn are used to calculate the frequencies of the fundamental ν(CO) vibrations of molecules containing one 13CO ligand. Some of the weak absorption bands which lie between 1850 and 2050 cm–1 may then be attributed to these ‘isotopic molecules whilst others are assigned to the formally i.r.-inactive vibrations of ‘normal’ molecules. The implications of the non-rigorous force constants are discussed.Keywords
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