ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 32, Number 6
JKCSEZ 32(6)
December 20, 1988 

The rates of oxygen ring formation of [Mo2O3(Ox)2(OxH)2(NCS)2] have been investigated spectrophotometric method in binary aqueous mixtures. Temperature was 20℃ to 40℃ and pressure was varied up to 1500 bar. The observed rate constants are increased by hydrogen ion and decreased by thiocyanate. The more increasing of co-solvents dielectric constant, the more stable intermediate is formed. The observed rate constant is given by, k_obs^-1 = k^-1 (1 + K^-1[H2O]^-1) All activation parameters are positive values. The oxygen ring formation of [Mo2O3(Ox)2(OxH)2(NCS)2] is believed to be a interchange-dissociative mechanism.