Novel ruthenium(V) dioxo complexes: synthesis, characterization, and reactivity of trans-[Ru V (tmc)(O)2]ClO4(tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetra-azacyclotetradecane)
作者:Chi-Ming Che、Kwok-Yin Wong
DOI:10.1039/c39860000229
日期:——
trans-[RuV(tmc)(O)2]ClO4(tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetra-azacyclotetradecane) has been generated by electrochemical reduction of trans-[RuVI(tmc)(O)2](ClO4)2 in acetonitrile; it is paramagnetic (µeff.= 1.98 µB) and rapidly disproportionates into trans-[RuVI(tmc)(O)2]2+ and trans-[RuIV(tmc)(O)(OH2)]2+ upon dissolution in aqueous acidic solution.
Kinetics and Mechanism of the Oxidation of Hydroquinones by a <i>trans</i>-Dioxoruthenium(VI) Complex
作者:William W. Y. Lam、Mendy F. W. Lee、Tai-Chu Lau
DOI:10.1021/ic051382i
日期:2006.1.1
The kinetics of the oxidation of hydroquinone (H(2)Q) and its derivatives (H(2)Q-X) by trans-[Ru(VI)(tmc)(O)(2)](2+) (tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) have been studied in aqueousacidic solutions and in acetonitrile. In H(2)O, the oxidation of H(2)Q has the following stoichiometry: trans-[Ru(VI)(tmc)(O)(2)](2+) + H(2)Q --> trans-[Ru(IV)(tmc)(O)(OH(2))](2+) + Q. The reaction
Kinetics and mechanism of the oxidation of iodide by trans-dioxoruthenium (VI)
作者:Tai-Chu Lau、Kent W. C. Lau、Keung Lau
DOI:10.1039/dt9940003091
日期:——
The kinetics of reduction of trans-[Ru(tmc)O2]2+ (tmc = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) by iodide has been studied in aqueous acidic solution. The reaction has the following stoichiometry: trans-[Ru(VI)(tmc)O2]2+ + 31- + 2H+ --> trans-[Ru(IV)(tmc)O(OH2)]2+ + l3-. The rate law is -d[Ru(VI)]/dt = (k(a) + k(b)]H+]) [Ru(VI)] [l-] with k(a) = 0.041 +/- 0.013 dm3 mol-1 s-1 and k(b) = 18.5 +/- 0.2 dm6 mol-2 s-2 at 25.0 degrees-C and 0.1 mol dm-3 ionic strength. For k(a) DELTAH(double dagger) = 42.9 +/- 9.4 kJ mol-1 and DELTAS(double dagger) = -131 +/- 40J K-1 mol-1, while for k(b), DELTAH(double dagger) = 36.9 +/- 2.9 kJ mol-1 and DELTAS(double dagger) = -97 +/- 10 J K-1 mol-1. A mechanism involving oxgen-atom transfer from Ru(VI) to iodide is consistent with the data.
Che, Chi-Ming; Lau, Keung; Lau, Tai-Chu, Journal of the American Chemical Society, 1990, vol. 112, # 13, p. 5176 - 5181