Notes. Further comments on one-electron oxidation versus nitrosyl complex formation during the reactions of the nitrosyl cation with metal carbonyl derivativest

Abstract
The cation [NO]+ reacts with [M(CO)4(L–L)][1 : M = Cr, Mo, or W; L–L = Ph2PCH2CH2PPh2(dppe) or Ph2PCH2PPh2, (dppm)] to give [M(CO)3(NO)(L–L)]+(2) or, when NO is removed from the reaction mixture, [M(CO)4(L–L)]+(3; M = Cr). A modification is therefore made to the mechanism previously proposed for the reactions of [NO]+ with metal carbonyl derivatives, [MLn], such that the intermediate adduct [MLn(NO)]+ is in equilibrium with [MLn]+ and NO radicals. The isolation of the acid–base adducts [Ag{M(CO)4(L–L)}2]+(4; M = Mo or W, L–L = dppe or dppm), from the reaction of (1) with Ag+ ions, is indirect evidence tor the formation of seven-co-ordinate intermediates, [M(CO)4(NO)(L–L)]+, in the reactions between (1) and [NO]+.

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