Reactions of dihalogenotriorgano-phosphorus, -arsenic and -antimony compounds with [Fe<sub>2</sub>(CO)<sub>9</sub>]. Single-crystal structures of the iron(<scp>III</scp>) complexes [(Ph<sub>3</sub>PO)<sub>2</sub>H][FeBr<sub>4</sub>] and [Ph<sub>4</sub>Sb][Fel<sub>4</sub>]·Ph<sub>3</sub>Sbl<sub>2</sub>and of [Fe(CO)<sub>3</sub>(Ph<sub>3</sub>P)<sub>2</sub>]
作者:Helen P. Lane、Stephen M. Godfrey、Charles A. McAuliffe、Robin G. Pritchard
DOI:10.1039/dt9940003249
日期:——
The reaction of [Fe2(CO)9] with compounds of stoichiometry R3EX2 [R3E = Ph3P, (p-MeOC6H4)3P, Me2PhP, Me3As or Ph3Sb, X = I; R3E = Ph3P, Ph3As or Me3As, X = Br] has been investigated and shown to yield diverse products. A series of complexes with the ionic structure [R3EX][Fe(R3E)X3] [E = P, R3 = Ph3, Me2Ph or (p-MeOC6H4)3, X = I; R3E = Me3As; X = I or Br] has been obtained. The reaction of [Fe2(CO)9] with Ph3PBr2 and Ph3AsBr2, however, resulted in the formation of the iron(III) complexes [(Ph3E)2Br][FeBr4]. Hydrolysis of [(Ph3P)2Br][FeBr4] by trace quantities of water produces [(Ph3PO)2H][FeBr4], the crystal structure of which has been determined. Triphenylantimony diiodide reacted with [Fe2(CO)9] yielding the surprising ionic adduct [Ph4Sb][FeI4].Ph3SbI2, remarkable not only for the phenyl migration at the antimony atom, but also for the formation of the rare [FeI4]- anion from a zerovalent iron carbonyl complex. The reaction of [Fe2(CO)9] with the milder diphosphine tetraiodide, I2Ph2PCH2CH2PPh2I2, produced [Fe(CO)3(Ph2PCH2CH2PPh2)I][I3], a complex in which three CO ligands are retained.