191545-27-4Relevant academic research and scientific papers
Complexes containing the unit Rh2P 'down curve sign' PM (M=Cr or Mn, P 'down curve sign' P = bis(diphenylphosphino) alkane) ; the independence of the metal centres
County, Geoffrey R.,Dickson, Ron S.,Jenkins, Susan M.,Johnson, Julian,Paravagna, Olga
, p. 49 - 57 (1997)
Treatment of (η5-C5H5)2Rh2(CO){η1-Ph2P(CH2)nPPh2}(μ-η1:η1-CF3C2CF3) (I) with (η5-CH3C5H4)Mn(CO)2(thf) or Cr(CO)5(thf) gives the hetero-trinuclear products (η-C5H5)2Rh2(CO)(μ-CF3C2CF3){μ:η1:η1-Ph2P(CH2)nPPh2}(η-CH3C5H4)Mn(CO)2 (II, n = 1-4) and (η5-C5H5)2Rh2(CO)(μ-CF3C2CF3){μ:η1:η1-Ph2P(CH2)nPPh2}Cr(CO)5 (IV, n = 1-4) in good yields. In these products, the configuration of the CO and bisphosphine units on the Rh-Rh bond is trans. Related reactions between (η5:η5-C5H4CH2C5H4)Rh2(CO){η1-Ph2P(CH2)nPPh2}(μ-η1:η1-CF3C2CF3) (V) and the same solvated manganese and chromium complexes give (η5:η5-C5H4CH2C5H4)Rh2(CO)(μ-CF3C2CF3){μ:η1:η1-Ph2P(CH2)nPPh2}(η-CH3C5H4)Mn(CO)2 (VI, n=1, 2 or 4) and (η5:η5-C5H4CH2C5H4)Rh2(CO)(μ-CF3C2CF3){μ:η1:η1-Ph2P(CH2)3PPh2}(CrCO)5 (VIII). The complexes (VI) and (VIII) have a mutually cis arrangement of CO and the bisphosphine on the Rh-Rh bond. Attempts to induce the complexes (IV), (V), (VI), and (VIII) to form clusters by loss of CO and Rh-M bond formation were not successful. Treatment with trimethylamine oxide or sunlight irradiation generally resulted in loss of the hetero-metal and formation of the dirhodium phosphine oxide complexes (III, n = 2 or 4) and (VII, n = 2, 3).
