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1Author    Max Preisenberger, A. Nnette Schier, H. Ubert, Schm IdbaurRequires cookie*
 Title    Variations in the Chain Structure of Cationic (Phosphine)gold(I) Dialkyldithiophosphate Complexes  
 Abstract    Treatment of dithiophosphoric acid diesters (RO)2P(S)SH with appropriate quantities of tris[(phosphine)gold(I)]oxoniumtetrafluoroborates {[(R'3P)Au]30}+ BF4_ in dichloromethane gives di-or trinuclear complexes of the types {(RO)2P[SAu(PR'3)]2/ 3}+/2+ (2) BF4~ as colour­ less, crystalline salts. As determined by single crystal X-ray diffraction studies, in the 1:2 complexes (with R = R' = Me and R' = Et, R = Ph and o-Tol), each gold atom is attached to a different sulfur atom, but with short intracationic Au-Au contacts. These cations are associated to form strings through intermolecular Au-Au contacts in the first case (R = Et), but through additional Au-S contacts in the second (R = Ph). For R = o-Tol, the cations are not associated at all owing to steric hindrance. This result is indicative of very small energy differences between the two modes of association. The 1:3 complexes are fluxional in solution and show virtually equivalent R3PAU groups in the NMR spectra at 20°C, but at low temperature non-equivalent ligands can be distinguished as shown previously for analogous dithiophosphinate derivatives. 
  Reference    Z. Naturforsch. 53b, 781—787 (1998); received May 18 1998 
  Published    1998 
  Keywords    Gold Complexes, Phosphinates, Thiophosphinates, Dithiophosphinates 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0781.pdf 
 Identifier    ZNB-1998-53b-0781 
 Volume    53 
2Author    Horst Kunkely, Arad VoglerRequires cookie*
 Title    Photooxidation of Dicyanoaurate(I) Induced by Metal-to-Ligand Charge Transfer Excitation  
 Abstract    The irradiation of [Au(CN)2]_ in oxygen-saturated acetonitrile leads to photooxidation of Au(I). In the presence of additional chloride [AutCN^CL]-is formed with < /> = 0 .5 x 1 0 -4 at Ajrr = 2 5 4 nm. It is assumed that [Au(CN)2]~ in its metal-to-ligand charge transfer state undergoes an excited state electron transfer to oxygen in the primary photochemical step. 
  Reference    Z. Naturforsch. 53b, 853—855 (1998); received April 12 1998 
  Published    1998 
  Keywords    Photochemistry, Charge Transfer, Gold Complexes, Cyanide Complexes 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0853.pdf 
 Identifier    ZNB-1998-53b-0853 
 Volume    53 
3Author    Hubert Schmidbaur, ArefA M AlyRequires cookie*
 Title    ferf-Butylphosphin-Komplexe von Gold(I)-und Silber(I)-halogeniden te?^-Butylphosphine Complexes of Gold(I) and Silver(I) Halides  
 Abstract    From HAuCLi and tri-<er£-butyl phosphine in methanol the gold(I) complex [(CH3)3C]3P-Au-C1 (1) has been synthesized and converted into the bromide 2 and iodide 3, using KBr and KI, respectively, in acetone solvent. The corresponding P-Cl functional complexes [(CH3)3C]2PCl-AuCl (4) and (CH3)3CPC12 -AuCl (5) could be obtained from (carbonyl)gold chloride ClAu(CO) and the chlorophosphine in benzene, with evolution of CO. The di-£e^-butyl-phosphine analog, [(CH3)3C]2PH -AuCl (7) results from a low-temperature reduction of HA11CI4 with this phosphine. All these gold(I) complexes are soluble in many solvents as monomers. The corresponding silver compounds, prepared from [(CH3)3C]3P and AgCl, Br, I in an inert solvent, appear to be oligomers, however, and showed dimer or tetramer association in halocarbon or benzene solvent. Infrared and 1 H, 13 C, 31 P NMR spectra have been used for further characterization of the compounds. 
  Reference    (Z. Naturforsch. 34b, 23—26 [1979]; eingegangen am 12. Oktober 1978) 
  Published    1979 
  Keywords    Gold Complexes, Silver Complexes, Phosphine Complexes 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0023.pdf 
 Identifier    ZNB-1979-34b-0023 
 Volume    34 
4Author    K. C. Dash, A. Schmidpeter++, H. Schmidbaur+Requires cookie*
 Title    Gold Complexes of a P-Coordinate Cyclotriphosphazene [1,2]  
 Abstract    Contrary to the reports on the coordination oi copper (I) to N/P-ambidentate cyclotri-phosphazenes, gold (I), gold (III) and dimethylgoldf 111) chloride are found to become exclusively P-coordinated to the prototype ligand 2-methyl-4,4,6,6-tetraphenylcyclotri-phosphazene (1). The P-H proton is transferred to an adjacent nitrogen atom of the heterocycle. According to temperature dependent NMR spectra, the AuCl and the AuClß complexes are fluxional molecules or ions, resp., with a rapid proton transfer between P-NH-P and P = N-P functions. The behaviour is similar to that of related palladium and platinum complexes, reported previously. 
  Reference    Z. Naturforsch. 35b, 1286—1288 (1980); eingegangen am 9. Juni 1980 
  Published    1980 
  Keywords    Gold Complexes, Cyclotriphosphazenes, N/P-Ambidentate System, Tautomerism 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1286.pdf 
 Identifier    ZNB-1980-35b-1286 
 Volume    35 
5Author    Annette Schier, Hubert SchmidbaurRequires cookie*
 Title    Derivate und Koordinationsverbindungen des Triphenylphosphoniumcyclopropylids (C6H5 )3P =C(CH2 )2  
 Abstract    Triphenylphosphonium cyclopropylide is converted into the corresponding 1-H-or 1 -D-cyclopropylphosphonium bromide in the reaction with HBr or DBr, respectively. With methyl iodide, the 1-methyl-cyclopropylphosphonium iodide is generated. Addition of BH3 (as THF -BH3) yields trihydrido-(l-triplienylphosphoniocyclopropyl)borate -(CH3)3A1 and (C2Hs)3Ga also give 1:1 adducts, the metal center being attached again to C-l of the cyclopropyl ring. -Complexes of AuCl, however, are easily transformed into ionic ] : 2 complexes, irrespective of the ratio of the reactants employed. Au(I) is two-coordinate in those complexes with two intact cyclopropylides as the sole ligands. -NMR data of all the new materials are presented. Einführung 
  Reference    Z. Naturforsch. 37b, 1518—1523 (1982); eingegangen am 9. August 1982 
  Published    1982 
  Keywords    Ylide Complexes, Triphenylphosphonium Cyclopropylide, Phosphorus Ylides, Gold Complex 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1518.pdf 
 Identifier    ZNB-1982-37b-1518 
 Volume    37 
6Author    W. Schneider, K. Angermaier, H. SchmidbaurRequires cookie*
 Title    Polynuclear Gold Complexes of the Carbodiimide Unit [N=C=N]2  
 Abstract    The reaction of N,N'-bis(trimethylsilyl)carbodiimide with equimolar quantities of tris[(triphenylphosphine)gold]oxonium tetrafluoroborate in dichloromethane at -40°C gives high yields of a trinuclear complex {[(Ph3P)Au]2NCN[Au(PPh3)]}+ BF4~(1). According to variable temperature NMR data the cation is fluxional in solution with a rapid site exchange of the [(Ph3P)Au] units, but has an unsymmetrical (N,N,N') low temperature ground state configu­ ration. A single crystal X-ray diffraction study has shown that in the crystal lattice these cations are associated further into cyclic, hexanuclear dimers through two short head-to-tail Au-Au contacts (auriophilicity). Treatment of complex 1 with one equivalent of [(Ph3P)Au]+ BF4_ in tetrahydrofuran affords a tetranuclear complex {[(Ph3P)Au]2NCN[Au(PPh3)]2}2+ 2BF4_ (2). The ambient temperature NMR spectra of 2 suggest a fluxional, pseudo-symmetrical structure, but at low temperature a set of three 11P signals (1:2:3 intensity) indicates an aggregation into higher nuclearity species with non-equivalent [Au(PPh3)] units. 
  Reference    Z. Naturforsch. 51b, 801—805 (1996); received December 4 1995 
  Published    1996 
  Keywords    Carbodiimide, Gold Complexes, (Phosphine)gold Carbodiimides 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0801.pdf 
 Identifier    ZNB-1996-51b-0801 
 Volume    51 
7Author    Angela Bayler, Andreas Bauer, Hubert SchmidbaurRequires cookie*
 Title    Chiral Phosphine Ligands in the Structural Chemistry of Gold  
 Abstract    The reaction of chloro(dimethylsulfide)gold(I) with (2-hydroxybutyl)diphenylphosphine (L) (racemic mixture) in dichloromethane affords high yields of the racemic chiral complex (L)AuCl. Metathesis reactions with KBr or KI, respectively, in a two-phase solvent mix­ ture (CH2CI2/H2O) lead to a conversion into the corresponding bromide and iodide complexes (L)AuBr and (L)AuI. Treatment of silver chloride with the ligand L in acetonitrile yields the analogous 1:1 adduct (L)AgCl. The compounds have been characterized by their analytical and spectroscopic data, and the structures of (L)AuCl and (L)AuBr have been determined by single-crystal X-ray diffraction. The compounds build isomorphous crystal lattices (monoclinic, P2i/c) in which pairs of enantiomers (R-and S-configuration of L) are aggregated by two long hydrogen bonds between the hydroxyl group of the ligand and the halogen substituent of the neighbouring molecule. Cationic, linear two-coordinate 1:2 complexes (L)2Au+ X-(X = BF4, CIO4, SO3CF3) and (L)2Ag+ X-(X = BF4) are obtained in good yields by reaction of L with Me2SAuCl and AgX (molar ratio 2:1:1) or with AgBF4 (molar ratio 2:1), respectively. 31P NMR studies at variable temperature show an equilibrium between all possible stereoisomers (RR, SS, RS, SR) in solution with rapid ligand exchange at ambient temperatures. 
  Reference    Z. Naturforsch. 52b, 1477—1483 (1997); received October 14 1997 
  Published    1997 
  Keywords    Gold Complexes, Phosphane Complexes, Chiral Phosphanes, Crystal Structure, Diastereomers 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1477.pdf 
 Identifier    ZNB-1997-52b-1477 
 Volume    52