A facile method for the synthesis of heterobimetallic chlorobridged complexes containing (R_3P)_2MCl (M=Pt or Pd) fragments

摘要

A convenient synthesis of cationic, heterobimetallic complexes of general formulae [(R_3P)_2M~1(#mu#-Cl)_2M~2(chel)] BF_4, [(R_3P)_2M~1(#mu#-Cl)_2Rh(cod)] BF_4, and [(R_3P)_2M~1(#mu#-Cl)_2M~3(chel)] BF_4, (M~1, M~2=Pd~(II) or Pt~(II); M~3=Rh~(III) or Ir~(III), chel=anion of 2-phenylpyridine, benzo[h] quinoline, C_6H_5CHRNMe_2 or #eta#~3-allyl) has been elaborated. These complexes were formed in quantitative yields by metathesis reactions of the dicationic complexes [{(R_3P)_2M~1(#mu#-Cl)}_2] [BF_4]_2 with the corresponding neutral, homodimeric compounds [{(cod)Rh(#mu#-Cl)}_2] and [{(chel)M~3(#mu#-Cl)}_2]. Reactions with half-sandwich complexes such as [{(p-cym)RuCl(#mu#-Cl)}_2], (cym=cymene), on the other hand, were shown to result in chloride transfer. The structures of [(Bu_3P)_2Pt(#mu#-Cl)_2Pd(#eta#~3-C_3H_5)]BF_4 and [(Bu_3P)_2Pt(#mu#-Cl)_2Rh(bzq)_2] BF_4 (bzq=benzo[h]quinoline anion) were determined by X-ray diffraction analyses.