86475-63-0Relevant academic research and scientific papers
Electrochemical, chemical, and spectroscopic characterization of the trans-[tetracarbonylbis(triphenylphosphine)chromium]+/0 redox couple
Bagchi,Bond,Brain,Colton,Henderson,Kevekordes
, p. 4 - 9 (1984)
Electrochemical oxidation of trans-Cr(CO)4(PPh3)2 at mercury, silver, or platinum electrodes or chemical oxidation with AgClO4, NOPF6 or NOBF4 produces trans-[Cr(CO)4(PPh3)2]+. The 17-electron monomeric cation has been characterized by analysis and a wide variety of electrochemical (polarographic, voltammetric, and controlled potential electrolysis) and spectroscopic (infrared, electron spin resonance) techniques. trans-[Cr(CO)4(PPh3)2]+ is light and moisture sensitive and unlike trans-Cr(CO)4(PPh3)2 reacts relatively rapidly with acetonitrile, acetone, iodide, and bromide as well as water. All reactions studied produce trans-Cr(CO)4(PPh3)2 as a product, in some cases (bromide and iodide) by redox reactions and in others by disproportionation. Electron-transfer catalysis reactions initiated via the ligand, L, substitution reaction trans-[Cr(CO)4(PPh3)2]+ + L → trans-[Cr(CO)4PPh3L]+ + PPh3 do not appear to be favored, although the observation of Cr(CO)5PPh3 as a reaction product with CO in the presence of light suggests that this step may be light catalyzed. This reaction, if it occurs, is a slow step relative to other pathways, and the [Cr(CO)4(PPh3)2]+/0 redox couple is not a good candidate for electron-transfer catalysis.
