Abstract
Using infrared spectra the v(CO) and in some cases also the δ(MCO), v(MC) and v(MP) modes of the metal carbonyl complexes cis-M(CO) 4(LL) (M = Cr, Mo, W; LL = (C 6H 5) 2P(CH 2) n P(C 6H 5) 2; n = 1, 2) have already been investigated and results published. The CO force constants are also described in the literature. The compounds mentioned above, together with the complexes cis-M(CO) 4(C 6H 5) 2P(CH 2) 3P(C 6H 5) 2,were reinvestigated by infrared spectroscopy and for the first time by Raman spectroscopy. Likewise the influences of solvents on the v(CO) frequences were studied. The results obtained show the need to revise the assignments of the v(MC) and v(MP) modes.
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