Abstract
The i.r. spectra (4000-250 cm −1) of Cs 3[VO(CN) 5], [(C 2H 5) 4N] 3[VO(NCS) 5], and K 3 [ReO 2(CN) 4·2H 2O have been obtained and empirical band assignments made. From a study of the v (CN) frequency it was possible to ascertain that metal-cyanide π-bonding is probably more important in VO(CN) 5 3− than ReO 2(CN) 4 3−. Infrared evidence confirms the presence of N-bonded thiocyanate in VO(NCS) 5 3−. The electronic spectra of the mulled solidssuggest that the lowest-energy transition in symmetrical VO 2+ and trans-ReO 2 + systems is similar.
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