摘要:
The reaction of [{Rh(L2)Cl}2] (L2 = cyclo-octa-1,5-diene (COD), norbornadiene (NBD)) and 3,4-diaminotoluene (dat), 1,2-diaminobenzene (daphen)or 2,3-diaminopyridine (dapy), irrespective of the stoichiometric ratios employed, gave [Rh2(COD)2Cl2(LL)] or pentacoordinate [Rh(Cl)(NBD)(LL)] when LL = dat or daphen, and tetracoordinate [Rh(Cl)(diolefin)(LL)] when LL - dapy, bonded through the pyridine nitrogen. Mixtures of [(Rh(CO)2Cl)2] and LL(1/1) gave [Rh(CO)2(LL)][Rh(CO)2Cl2] when LL = dat, daphen or dapy. In solution, [Rh2(COD)2Cl2(LL)] or [Rh(Cl)(NBD)(LL)] is in equilibrium with the corresponding [Rh(L2)(LL)]+ cations. At low temperature, the cationic species becomes predominant. Dapy is usually. monodentate through the pyridine nitrogen if a coordinating anion, such as chlorine, is present. If not, chelate coordination through both amino groups occurs.