辅酶B_(12)模型化合物的研究(V)RCo(Salen)L配合物Co—C键断裂的动力学

Studies on Coenzyme B_(12) Model Complexes(Ⅴ)——Kinetics of Co-C Bond Cleavage of RCo(SaIen)L Complexes

运用光度法研究了RCo(Salen)L配合物在甲醇中热分解反应动力学;测定了Co—C键断裂的速率常数及活化能,得到表观速率常数顺序为i-C3H7>i-C4H9>n-C4H9>n-C3H7>C2H5,活化能顺序为i-C3H7<n-C4H9<i-C4H9≈n-C3H7<C2H5,讨论了影响速率常数和温度的因素。

The kinetics of thermolysis of RCo(Salen)L complexes in methanol was studied by using UV-Vis spectrophotometry.The observable rate constants and the energy of activation were determined.The sequence of the rate constants is i-C3H7>i-C4H3>n-C4H9>n-C3H7>C2H5 and of the energy of activation is i-C3H7<n-C4H9<i-C4H9<n-C3H7<C2H5 The effects on thermolysis were discussed.