The logK, ΔH and ΔS values for the equilibrium displacement of the axial water molecule in alkylaquocobatoximes [RCo(DH)2.H2O; DH ≡ dimethylglyoximate mono anion] by dimethoxyethylamine in aqueous medium are found to correlate Taft's σ* parameter mixed with Dubois' steric parameter E'(s), for a number of R groups except for CH2CH2COOCH3. To investigate the reason, the structure of CH3 OOCCH2CH2Co(DH)2.H2O (1) has been determined by molecular mechanics. It is found that the alkyl group in 1 has a bent conformation which allows H-bonding between the carbonyl oxygen atom and the equatorial oximate H atom. This possibly changes the steric and electronic effects of the alkyl group in 1. It is mentioned that the X-ray crystal structure of the cobaloxime.1 is not yet known.
|Original language||English (US)|
|Number of pages||4|
|Journal||Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry|
|State||Published - Sep 1999|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry