Elsevier

Spectrochimica Acta

Volume 18, Issue 1, January 1962, Pages 89-100
Spectrochimica Acta

Infrared spectroscopic study on the co-ordination bond-I: Infrared spectra of cobalt hexammine, pentammine and trans-tetraammine complexes

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Abstract

Infrared spectra of [Co(NH3)6]3+, [Co(NH3)5X]2+ (X=F, Cl, Br and I), and trans- [Co(NH3)4X2]+ (X =Cl,Br) have been measured in the 4000-250 cm−1 region. In addition to the characteristic NH stretching and NH3 deformation vibrations, Co—ligand stretching and skeletal deformation vibrations have been observed near 500 cm−1 and near 300 cm−1, respectively. Normal coordinate treatment has been made and the observed frequencies have been quantitatively assigned on the basis of the potential energy distribution and L- matrix. The Co—ligand stretching force constant shows that this co-ordination bond should be appreciably covalent.

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