The oxygenation constants (Ko2) of cobalt(Ⅱ) hydroxamates (CoL^1 2-CoL^3 2) with benzo-15-crown-5 (B15C5) pendants were measured over the range of -5 to +20 ℃, and the values of thermodynamic parameters (...The oxygenation constants (Ko2) of cobalt(Ⅱ) hydroxamates (CoL^1 2-CoL^3 2) with benzo-15-crown-5 (B15C5) pendants were measured over the range of -5 to +20 ℃, and the values of thermodynamic parameters (ΔH^0 and ΔS^0) were calculated based on these (Ko2) values, Meanwhile, these crowned complexes were employed to the oxidation for p-xylene to p-toluic acid with air at 110Δ under normal atmospheric pressure. The effects of B15C5 pendant and the length of chain bonded to B15C5 in these complexes on the O2-binding capabilities and oxidation for p-xylene were investigated with the comparison of crown-free analogues CoL^4 2.展开更多
基金The authors gratefully acknowledge the grants from the National Natural Science Foundation of China(No.20072025)Education 0ffice Foundation of Sichuan Province(No.2005C012)Sichuan Provincial Department of Science&Technology(No.2006J13-143)in support of this work.
文摘The oxygenation constants (Ko2) of cobalt(Ⅱ) hydroxamates (CoL^1 2-CoL^3 2) with benzo-15-crown-5 (B15C5) pendants were measured over the range of -5 to +20 ℃, and the values of thermodynamic parameters (ΔH^0 and ΔS^0) were calculated based on these (Ko2) values, Meanwhile, these crowned complexes were employed to the oxidation for p-xylene to p-toluic acid with air at 110Δ under normal atmospheric pressure. The effects of B15C5 pendant and the length of chain bonded to B15C5 in these complexes on the O2-binding capabilities and oxidation for p-xylene were investigated with the comparison of crown-free analogues CoL^4 2.