A Pentanuclear Mixed Gold(III)−Silver(I) Phosphide with an Unusual T-Frame μ3-Cl Bridge

Synthesis and Structural Characterization of Phosphanide Gold(III)/Gold(I) Complexes and Their Thallium(III) and Gold(III) Precursors

In this paper, we describe a series of diphenylphosphane and diphenylphosphanide gold(III) and gold(III)/gold(I) complexes containing 3,5-C₆Cl₂F₃ as aryl ligands at gold that have been synthesized due to the arylating and oxidant properties of the new polymeric thallium(III) complex [TlCl(3,5-C₆Cl₂F₃)₂]_n (1). Its reaction with [Au(3,5-C₆Cl₂F₃)(tht)] (tht = tetrahydrothiophene) produces the gold(III) complex [Au(3,5-C₆Cl₂F₃)₃(tht)] (2), which allows the synthesis of the diphenylohosphane derivative [Au(3,5-C₆Cl₂F₃)₃(PPh₂H)] (3). Its treatment with acetylacetonate gold(I) derivatives leads to two novel Au^III/Au^I phosphanido-bridged complexes, [PPN][Au(3,5-C₆Cl₂F₃)₃(µ-PPh₂)AuCl] (4) and [PPN][{(3,5-C₆Cl₂F₃)₃Au(µ-PPh₂)}₂Au] (5). All these complexes have been characterized, and the crystal structures of 1, 2, 4 and 5 have been established by single crystal X-ray diffraction methods, showing a novel polymeric arrangement in 1.

New adducts of silver(I) halides, AgX (X = Cl, Br), with bidentate phosphine ligands: syntheses and molecular structures of [Ag3(μ 3-Cl)2(μ-dppm)3][PF6], [Ag3(μ 3-Br)2(μ-dppm)3][AgBr2], {[Et4N][Ag2 (μ-Br)3(μ-dppe)]} n , [Et4N]2[(AgCl2)2(μ-dppe)], and [(AgCl)2(μ-dppp)2]

Interaction of AgCl with bis(diphenylphosphino)methane (dppm) in THF/MeCN in the presence of K[PF6] or [Et4N]Br afforded typical trinuclear cationic trigonal-bipyramidal complexes [Ag3(μ 3-Cl)2(μ-dppm)3][PF6] (1) or [Ag3(μ 3-Br)2(μ-dppm)3][AgBr2] (2), respectively. Treatment of AgBr with bis(diphenylphosphino)ethane (dppe) in THF/MeCN in the presence of [Et4N]Br gave a polymeric complex {[Et4N][Ag2(μ-Br)3(μ-dppe)]} n (3) with a dinuclear {Ag2(μ-Br)3} core. The reaction of AgCl with dppe or bis(diphenylphosphino)propane (dppp) in THF/MeCN in the presence of [Et4N]Cl resulted in the isolation of a dinuclear anionic complex [Et4N]2[(AgCl2)2(μ-dppe)] (4) with one μ-dppe bridge or a dinuclear neutral complex [(AgCl)2(μ-dppp)2] (5) with two μ-dppp bridges and a 12-membered ring, respectively. The structures of complexes 1–5 with the bidentate phosphine ligands were determined by single-crystal X-ray diffraction.

From Diphosphane to Diphosphodiide Gold(III) Derivatives of 1,2-Diphosphinobenzene

Treatment of 1,2-diphosphinobenzene with [Au(C6F5)3(tht)] leads to the diphosphane derivative [{Au(C6F5)3}(1,2-PH2C6H4PH2)] (1), which further reacts with other pentafluorophenylgold(III) reagents in the presence of acetylacetonate as deprotonating agent to afford phosphane-phosphide complexes. The noncyclic PPN[{Au(C6F5)3}2(1,2-PHC6H4PH2)] (2; PPN = bis(triphenylphosphine)iminium) has been shown to be a useful starting material for the synthesis of higher nuclearity cyclic or noncyclic diphosphide or even diphosphodiide derivatives through similar reactions. The crystal structures of the trinuclear anionic NBu4[{Au(C6F5)3}(1,2-PHC6H4PH){Au(C6F5)2Cl}{mu-Au(C6F5)2}] (3) and the hexanuclear [{Au(C6F5)3}(1,2-PC6H4P){Au(C6F5)3}{mu-M(dppe)M}2] (M = Au (12), Ag (13)) have been established by X-ray diffraction methods, the last complexes having a bicyclic ring containing three intramolecular interactions between the M(I) centres.

Heterovalent AuIII−MI (M = Cu, Ag, Au) Complexes Derived from Incorporation of [Au(tdt)2]- (tdt = Toluene-3,4-dithiolate) with [M2(dppm)2]2+ (dppm = Bis(diphenylphosphino)methane)

Polynuclear heterovalent Au(III)-M(I) (M = Cu, Ag, Au) cluster complexes [Au(III)Cu(I)8(mu-dppm)3(tdt)5]+ (1), [Au(III)3Ag(I)8(mu-dppm)4(tdt)8]+ (2), and [Au(III)Au(I)4(mu-dppm)4(tdt)2]3+ (3) were prepared by reaction of [Au(III)(tdt)2]- (tdt = toluene-3,4-dithiolate) with 2 equiv of [M(I)2(dppm)2]2+ (dppm = bis(diphenylphosphino)methane). Complex 3 originates from incorporation of one [Au(III)(tdt)2]- with two [Au(I)2(dppm)2]2+ components through Au(III)-S-Au(I) linkages. Formation of complexes 1 and 2, however, involves rupture of metal-ligand bonds in the metal components and recombination between the ligands and the metal atoms. The Au(tdt)2 component connects to four M(I) atoms through Au(III)-S-M(I) linkages in syn and anti conformations in complexes 1 (M = Cu) and 3 (M = Au), respectively, but in both syn and anti conformations in complex 2 (M = Ag). The tdt ligand exhibits five types of bonding modes in complexes 1-3, chelating Au(III) or M(I) atoms as well as bridging Au(III)-M(I) or M(I)-M(I) atoms in different orientations. Although complexes 1 and 2 are nonemissive, Au(III)Au(I)(4) complex 3 shows room-temperature luminescence with emission maximum at 555 nm (tau(em) = 3.1 micros) in the solid state and at 570 nm (tau(em) = 1.5 micros) in acetonitrile solution.

Tetraphosphinitoresorcinarene Complexes: Cationic Silver(I) and Copper(I) Halide Complexes as Mercurate(II) Anion Receptors

The reactions of mercury(II) halides with the tetraphosphinitoresorcinarene complexes [P4M5X5], where M=Cu or Ag, X=Cl, Br, or I, and P4=(PhCH2CH2CHC6H2)4(O2CR)4(OPPh2)4 with R=C6H11, 4-C6H4Me, C4H3S, OCH2CCH, or OCH2Ph, have been studied. The reactions of the complexes with HgX2 when M=Ag and X=Cl or Br occur with elimination of silver(I) halide and formation of [P4Ag2X(HgX3)], but when M=Ag and X=I, the complexes [P4Ag4I5(HgI)] are formed. When M=Cu and X=I, the products were the remarkable capsule complexes [(P4Cu2I)2(Hg2X6)]. When M=Ag and X=I, the reaction with both CuI and HgI2 gave the complexes [P4Cu2I(Hg2I5)]. Many of these complexes are structurally characterized as containing mercurate anions weakly bonded to cationic tetraphosphinitoresorcinarene complexes of copper(I) or silver(I) in an unusual form of host-guest interaction. In contrast, the complex [P4Ag4I5(HgI)] is considered to be derived from an anionic silver cluster with an iodomercury(II) cation. Fluxionality of the complexes in solution is interpreted in terms of easy, reversible making and breaking of secondary bonds between the copper(I) or silver(I) cations and the mercurate anions.