title: Cluster self-assembly of di[gold(I)]halonium cations.
abstract: Treatment of gold(I) halide complexes of the type L-Au-X [where L = PPh(3), PEt(3) with X = Cl, Br, I, or L = 2,6-(MeO)(2)C(6)H(3)PPh(2) with X = Cl] with AgSbF(6) in the molar ratio 2:1 in dichloromethane/tetrahydrofuran at -78 degrees C affords high yields of di[gold(I)]halonium salts of the formula [X[Au(PR(3))](2)](+) SbF(6)(-) (2-8). A determination of the crystal structures of the four triarylphosphine complexes (2-4, 8) revealed the presence of novel tetranuclear dications with a highly symmetrical structure (point group S(4)) that arises from self-assembly of the dinuclear monocations through a set of four equivalent aurophilic Au-Au interactions. A comparison with two reference structures of corresponding chloronium perchlorate and bromonium tetrafluoroborate salts with monomeric, dinuclear cations shows that the geometry of the latter is greatly altered on dimerization to optimize the interactions between the closed-shell metal centers (Au: 5d(10)). Weak metallophilic bonding clearly becomes significant only in crystal lattices where anions with a larger ionic radius (SbF(6)(-) vs. BF(4)(-), ClO(4)(-)) reduce the otherwise dominant role of strong interionic Coulomb forces. The results indicate that aurophilic bonding is indeed an ubiquitous, quite dependable mode of intermetallic interactions provided that the right environment is chosen to allow the weak forces to become operative.
authors.affiliation: Anorganisch-Chemisches Institut, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany. h.schmidbaur@lrz.tum.de
authors.forename: Hubert
authors.initials: H
authors.lastname: Schmidbaur
authors.forename: Armin
authors.initials: A
authors.lastname: Hamel
authors.forename: Norbert W
authors.initials: NW
authors.lastname: Mitzel
authors.forename: Annette
authors.initials: A
authors.lastname: Schier
authors.forename: Stefan
authors.initials: S
authors.lastname: Nogai
mesh_terms: D002412:Cations; D006046:Gold / Q000737:chemistry*; D046911:Macromolecular Substances; D009682:Magnetic Resonance Spectroscopy; D008956:Models, Chemical; D008958:Models, Molecular; D009942:Organometallic Compounds / Q000737:chemistry; D009943:Organophosphorus Compounds / Q000737:chemistry; D010472:Perchlorates / Q000737:chemistry; D011485:Protein Binding; D012492:Salts
chemical_list: D002412:Cations; D046911:Macromolecular Substances; D009942:Organometallic Compounds; D009943:Organophosphorus Compounds; D010472:Perchlorates; D012492:Salts; D006046:Gold