TOPOLOGICAL INVESTIGATIONS OF THE STATE OF SOME TRANSITION-METAL IONS IN SOME BINARY-MIXTURES OF NONELECTROLYTES - MOLAR EXCESS VOLUMES

Molar excess volumes have been measured at 308.15 K for binary mixtures of pyridine (A) saturated with anhydrous CoCl2(S), denoted A(S), with aniline, omicron-toluidine, formamide or N,N-dimethylformamide, denoted (B), and the results have been rationalized to suggest that the saturation of pyridine with anhydrous CoCl2 converts the octahedrally coordinated Co2+ (in anhydrous CoCl2) into tetrahedrally coordinated Co2+ in such neutral entities as Cl2Co(Py)2; and that the addition of B to A(S) results in the formation of molecular entities of the type Cl2Co(Py)B. These conclusions have been supported by infrared- and molar mass-spectroscopic studies.