Schwingungsspektren und Kraftkonstanten der Hexacyano-Komplexe des Mangan(I), Technetium(I) und Rhenium(I) / Vibrational Spectra and Force Constants of the Hexacyano Complexes of Mangan(l), Technicium(I) and Rhenium(l)

Abstract

The infrared and Raman spectra of the complex salts K₅[Mn(CN)₆], K₅[Tc(CN)₆] and K₅[Re(CN)_s] have been recorded in the range from 4000 to 40 cm^-1. All expected fundamental vibrations have been observed and could be assigned to the irreducible representations of the sym­metry point group Oh . The calculation of the force constants is based on the concept of the generalized valence force field. The low CN-valence force constants indicate the relatively strong Π-bonding character of the metal carbon bond, which is especially pronounced for K₅[Tc(CN)₆).