Reactions of dihalogenotriorgano-phosphorus, -arsenic and -antimony compounds with [Fe2(CO)9]. Single-crystal structures of the iron(III) complexes [(Ph3PO)2H][FeBr4] and [Ph4Sb][Fel4]·Ph3Sbl2and of [Fe(CO)3(Ph3P)2]
摘要:
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.
Reactions of dihalogenotriorgano-phosphorus, -arsenic and -antimony compounds with [Fe2(CO)9]. Single-crystal structures of the iron(III) complexes [(Ph3PO)2H][FeBr4] and [Ph4Sb][Fel4]·Ph3Sbl2and of [Fe(CO)3(Ph3P)2]
摘要:
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.
Reaction of R3AsI2(R = Me or Et) with zinc metal powder to produce ZnI2(AsMe3)2 and [ZnI2(AsEt3)]2, the first tertiary arsine complexes of zinc(II)
作者:Stephen M. Godfrey、Charles A. McAuliffe、Robin G. Pritchard、Joanne M. Sheffield
DOI:10.1039/dt9960003309
日期:——
The reaction of Et3AsI2 with zinc metal powder produced the dimeric complex [ZnI2(AsEt3)]2, whereas that of Me3AsI2 gave equimolar quantities of ZnI2(AsMe3)2 and ZnI2, the latter being identified by X-ray powder diffraction. Both arsine complexes have been structurally characterised and as such represent the only examples for zinc(II). A structural change is thus seen on changing the R groups on the R3AsI2 compound. The complex ZnI2(AsMe3)2 represents the sole example of a bis(ligand) complex of zinc(II) containing a Group 15 donor atom. Both complexes contain the zinc atoms in essentially tetrahedral geometry but significant distortion is noted for ZnI2(AsMe3)2, which may be the result of unfavourable steric interactions.
Facile synthesis of a rare example of an iron(III) iodide complex, [FeI3(AsMe3)2], from the reaction of Me3AsI2 with unactivated iron powder
作者:Nicholas A. Barnes、Stephen M. Godfrey、Nicholas Ho、Charles A. McAuliffe、Robin G. Pritchard
DOI:10.1016/j.poly.2013.02.066
日期:2013.5
Abstract The reaction of Me3AsI2 with unactivated ironpowder provides a synthetic entry into the coordination chemistry of iron(III) iodide, which is inaccessible by traditional routes due to the low stability of the parent halide FeI3. The reaction of ironpowder with Me3AsI2 results in the formation of a trigonal bipyramidal complex, [FeI3(AsMe3)2], which features the iodide ligands in the equatorial
Facile one-step synthesis of the cobalt(III) and nickel(III) tertiary arsine complexes [MI3(AsMe3)2](M = Co or Ni) directly from the powdered elemental metals
作者:Neil Bricklebank、Stephen M. Godfrey、Charles A. McAuliffe、Robin G. Pritchard
DOI:10.1039/dt9960000157
日期:——
Diiodotrimethylarsine, Me3AsI2, was treated with cobalt or nickel metal powder to give the metal(III) complex, [MI3(AsMe3)2]. In the case of cobalt, a metal(II) complex, [AsMe3I][CoI3(AsMe3)], was also produced, whereas for the nickel reaction only the nickel(III) complex, [NiI3(AsMe3)2], was formed in quantitative yield. The only other product from the reactions was diiodine, which was detected spectrophotometrically. Both complexes have been crystallographically characterised and found to be isostructural, consisting of a metal(III) atom with three equatorial iodide ligands capped by two trimethylarsine ligands. These complexes are unique examples of X-ray structural characterisation of compounds of this stoichiometry. Conventional wisdom would not have expected the ‘soft’ ligands I– and AsMe3 to bind to the relatively hard metal(III) centre.