Raman spectra and vibrational assignments of hexacyano-complexes

Abstract

The Raman spectra of the potassium salts of [M(CN)₆]^3–(M = Co, Fe, Mn, and Cr) and [M(CN)₆]^4–(M = Fe and Ru), have been measured in the solid state and in aqueous solution and also of solid K₄[Mn(CN)]₆, 3H₂O and K₅[Mn(CN)₆],H₂O. The i.r. spectra of solid K₅[Mn(CN)₆],H₂O, K₄[V(CN)₆],3H₂O, and ‘K₃[V(CN)₆],H₂O’ are also reported. Assignments of fundamental vibrational modes are proposed for the anions on the basis of these measurements and of published i.r. data, and the results are correlated with σ- and π-effects in the metal–cyanide bond.