15738-86-0Relevant articles and documents
Chelate and bridge complexes of metal carbonyl compounds with a ditertiary phosphine: A study of their formation and interconversion
Mawby, Roger J.,Morris, Donald,Thorsteinson, Erlind M.,Basolo, Fred
, p. 27 - 33 (1966)
The reactions of the compounds Co(NO)(CO)3 and Fe(NO2)(CO)2 with a severalfold excess of the diphosphine 1,2-bis(diphenylphosphino)ethane (diphos, (C6H5)2PCH2CH2P(C 6H5)2) are shown to yield, in toluene or tetrahydrofuran solution, fairly long-lived intermediates Co(NO)(CO)2(diphos) and Fe(NO)2(CO)(diphos) in which the diphosphine is only attached to the metal by one phosphorus atom. These intermediates are slowly converted to the chelate complexes Co(NO)(CO)(diphos) and Fe(NO)2(diphos) at rates which are independent of the free diphosphine concentration. Similar results have been obtained for CH3Mn(CO)5 which is converted, via an intermediate believed to be CH3COMn(CO)4(diphos), to the chelate complex CH3COMn(CO)3(diphos). Use of metal:diphosphine molar ratios of 2:1 yields complexes of the type [Co(NO)(CO)2]2(diphos), in which the diphosphine acts as a bridge between two metal atoms. These complexes can also be converted to the corresponding chelate complexes by reaction with excess diphosphine, but at a rate which is dependent on the free diphosphine concentration. The unsymmetrical bridge complex, Fe(NO)2(CO)(diphos)Co(NO)(CO)2, has been isolated and characterized.
