摘要:
[Rh(L(2))Cl](2) (L(2)=COD, NBD; L=CO) complexes react with 2-(2-aminoethyl)-1-methylpyrrol to give only neutral tetracoordinated RhCl(L(2))(aempyr) species, irrespective of the stoichiometric ratios employed. In solution, dynamic behaviour through pentacoordinated compounds is observed. The X-ray structure of RhCl(COD)(C7N2H12) indicates coordination through the primary amino group. Aminopyridines such as 2-(2-aminoethyl)pyridine or 2-(aminomethyl)pyridine afford, from the 1:2 reaction pentacoordinated RhCl(L(2))(LL') compounds or ionic [Rh(L(2))(LL')](+) species. The cationic species show association processes in solution. From the 1:1 reaction Rh-2(L(2))Cl-2(LL') complexes are obtained. When LL' = 2-(2-aminoethyl)pyridine the X-ray diffraction indicates an ionic structure [Rh(C8H12)(C7N2H10)][Rh(C8H12)Cl-2] in the solid state. In solution, evidence of an equilibrium between this species and the corresponding dimer [Rh(C8H12)Cl](2)(mu-C7N2H10) is observed.