Studies on Dimethylglyoximato-cobalt (III) Complexes. IV. Intramolecular O-H-O Hydrogen Bonds in Bis-(dimethylglyoximato)-cobalt (III)-complexes

Abstract

Abstract Infrared absorption spectra of hydrogen dichloro-bis-(dimethylglyoximato)-cobaltate (III) prepared from both normal and deuterated dimethylglyoxime and of several other dimethylglyoximato-cobalt (III)-complexes were measured. It has been ascertained through the data of deuterated complexes that the absorption band at 1725 cm−1 of hydrogen dichloro-bis-(dimethylglyoximato)-cobaltate (III) is attributable to the O-H stretching frequency under the formation of intramolecular O-H-O hydrogen bonds. All the bis-(dimethylglyoximato)-cobalt (III)-complexes show similar O-H stretching bands in the same region. It has been forecast that a series of examples of the very short and symmetric O-H-O hydrogen bond may be expected in the bis-(dimethylglyoximato)-cobalt (III)-complexes.