Basicity of transition metal carbonyl complexes : IX. An infrared study of lewis acid reactions with cyclopentadienyl and arene derivatives of groups VI and VII transition metal carbonyls and nitrosyls

The different courses of the interactions of cyclopentadienyl and arene derivatives of Group VI and VII transition metal carbonyl and transition complexes with Lewis acids, in solutions, have been studied by IR spectroscopy.The information of adducts involving the metal atom was observed for CpRe(CO)₂L (L = CO, PR₃) with SnCl₄, SnBr₄, TiCl₄; AreneM(CO)₃ (M = Cr, Mo, W) with SnCl₄, TiCl₄; and Ph₃PC₅H₄M(CO)₃ (M = Cr, Mo, W) with TiCl₄ and AlCl₃. Complexes CpM(CO)₂NO and CpM(CO(NO)PPh₃, depending on thier donor and acceptor nature, form adducts involving the oxygen atoms of CO or NO groups or the metal atom. CpCr(NO)₂Cl reacts with Lewis acids via the chlorine atom. The relative basicity of the different sites in the complexes investigated is discussed.