Raman spectra of multiply bonded metal species
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 10,p. 1067-1070
- https://doi.org/10.1039/dt9730001067
Abstract
The Raman and i.r. spectra of a series of dimeric molybdenum and rhodium compounds are reported. The metal–metal stretching frequencies are found to fall in the region 400 ± 4 cm–1 for the molybdenum carboxylates Mo2-(O2CR)4(R = Me, CF3, Et, Prn, Ph, and C6H11) and 342 ± 8 cm–1 for the (MO2X2)4– containing species (X = Cl and Br) indicating a difference in metal–metal bond strength between the two series of compounds which has not previously been recognised from X-ray data. The metal–metal stretching frequency of the dimolybdenum tetrakis-(perfluoroacetate) is lowered by the attachment of donor ligands along the metal–metal axis. The metal–metal stretching frequencies for the rhodium carboxylates Rh2(02CR)4 and Rh2(O2CR)4,2L (R = Me and Et, L = MeOH, H2O, Me2SO, and Ph3P) fall in the region 288–351 cm–1 and decrease with increasing donor strength of the attached ligands.Keywords
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