of the mer→trans conversion is largely governed by Rh–X bond rupture. A linear free-energy relation of type (iii) with a value of α of 1.2 correlates the free energy of activation of this conversion with the ΔG(m→t)‡=αΔG(m→t)⊖+β(iii), standard free energy of the reaction. This result is taken as an indication that there is little interaction between RhIII and X in the transition state.
可逆反应(i)的动力学已在
甲醇进行了研究[X =
硫脲,NN '-diphenylthiourea,反式- [
铑(L)2
氯2 ] + + X⇌聚体-的[Rh(L)(L') CL 2 X] +(I),
吡啶(PY),3ME-PY,3CL-PY,3CN-PY,4CN-PY,2ME-PY,2,4Me 2 -py,或2,4,6Me 3 -py ; L和L'= ö -dimethylaminophenyldimethylarsine-的NA和-作为分别]。该系统遵循费率定律(ii)。–d [Rh(L)2 Cl 2 + ] d t的速率常数= k (t → m) [Rh(L) 2 Cl 2 + ] [X] –k(m → t) [Rh(L)(L')Cl 2 X + ](ii),正向反应几乎不受该性质的影响除了具有相对低反应性的邻位取代的
吡啶外,该进入基团的
氨基甲酸酯基团也是如此。逆反应的速率常数在很大程度上取决于离去基团X。logk(m