Vibrational Spectrum and Structure of K3Ir(CN)6, K3Rh(CN)6, and K3Co(CN)6

摘要

The infrared spectra of crystalline K3Ir(CN)6and K3Rh(CN)6have been recorded. This information is combined with Raman data of other workers to yield a nearly complete assignment of the fundamental vibrational frequencies of the M(CN)63mdash;ions. Force constants have been calculated for these ions and that of Co(CN)63mdash;from previously reported spectra, and it is shown that there is a regular increase in metalmdash;carbon force constant in the order CoRhIr. The CN stretching force constant is about the same for these ions. The forcehyphen;constant data along with intensity data indicate an increase in both metalmdash;ligand sigma bonding and pi bonding in the order CoRhIr.