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The infrared and Raman spectra of the complex salts K 5 [Mn(CN) 6 ], K 5 [Tc(CN) 6 ] and K 5 [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 K 5 [Tc(CN) 6 ).

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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)