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  • 1
    Online Resource
    Online Resource
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Keywords: Geochemistry. ; Electronic books.
    Description / Table of Contents: This book provides basic tools to understand relations between plants and soil. It also details methods to interpret x-ray diffraction spectra used to identify clay minerals.
    Type of Medium: Online Resource
    Pages: 1 online resource (327 pages)
    Edition: 1st ed.
    ISBN: 9783642313592
    DDC: 551.9
    Language: English
    Note: Intro -- Introduction -- Contents -- Chapter 1: Geology and Chemistry at the Surface -- 1.1 The Geological Framework of Surface Geochemistry -- 1.1.1 Movement of Materials -- 1.1.2 Physical Constraints -- 1.1.2.1 Slope Failure and Transport -- 1.1.2.2 Resistance to Erosion -- 1.1.2.3 Water Transport of Dissolved and Suspended Material -- 1.1.2.4 Wind Transport -- 1.1.3 Chemical Effects -- 1.1.4 Alteration: Rock to Soil Transformation -- 1.1.4.1 Alteration and the Development of Alteration Profiles: Water Rock Interaction -- 1.1.4.2 Physical-Chemical Interactions -- 1.1.5 Alteration Profile -- 1.1.5.1 Water-Rock Interface -- 1.1.5.2 Alterite Zone -- 1.1.5.3 Soil Zone -- 1.1.5.4 Consequences of Alteration: Physical and Chemical Aspects -- 1.1.6 Plant and Soil -- 1.1.6.1 Erosion, the Movement of Matter and the Role of Plants -- 1.1.6.2 Chemical Conditions of the Rock-Alteration Transition -- 1.2 Chemical Elements and Associations in Surface Environments -- 1.2.1 Affinities of the Major Elements and Surface Geochemistry -- 1.2.2 Agents of Change -- 1.2.2.1 Oxygen -- 1.2.2.2 Water -- 1.2.3 Bonding Between Elements -- 1.2.4 Cation Substitutions -- 1.2.5 Chemical Types of Atoms and Multi-element Units -- 1.2.5.1 Anions and Cations -- 1.2.5.2 Cations and Oxygen Ions (Oxoanions) -- 1.2.6 Reduction of Oxoanions -- 1.2.6.1 Redox Cations (Transition Metals) -- 1.2.6.2 Heavy Metal Elements -- 1.2.7 Metals -- 1.2.7.1 Oxyhydroxide -- 1.2.8 Special Elemental Groups -- 1.2.8.1 Rare Earth Elements (Lanthanides) -- 1.2.8.2 Transuranic Radionuclides -- 1.2.9 Association of the Elements in Phases (Minerals) at the Surface -- 1.2.9.1 Oxoanions -- 1.2.10 Elements in Surface Phases -- 1.2.10.1 Atomic Substitutions within Crystals -- 1.2.11 Silicates -- 1.2.12 Oxides and Hydoxides -- 1.2.13 Carbonates -- 1.2.14 Phosphates -- 1.2.15 Sulfates. , 1.2.16 Substitutions of Ions in Mineral Structures -- 1.2.17 Mineral Surface Reactions -- 1.2.18 Summary -- 1.3 Useful Source Books -- Chapter 2: Elements in Solution -- 2.1 Ions and Water -- 2.1.1 Ions -- 2.1.2 Ions in Water -- 2.1.3 Inner Sphere: Outer-Sphere Attractions -- 2.1.4 Attraction of Ions to Solids: Absorption-Adsorption -- 2.2 Absorption (Outer-Sphere Attraction and Incorporation Within the Mineral Structures) -- 2.2.1 Dynamics of Interlayer Absorption of Hydrated Cations in Clay Minerals -- 2.2.1.1 Selectivity of Cations -- 2.2.1.2 Hydration and Ion Exchange -- 2.2.1.3 Hydration State of Ions in Clay Minerals -- 2.2.1.4 Dehydration and Layer Collapse -- 2.3 Adsorption (Inner-Sphere Surface Chemical Bonding) -- 2.3.1 Edge Surface Sites and their Interactions with Cations and Anions -- 2.3.2 Origin of the Surface Charge of Soil Minerals -- 2.3.3 Acid-Base Reactions at the Surface of Minerals and the Notions of Points of Zero Charge -- 2.3.4 What Is the Significance of PZCs? -- 2.3.5 Ions and Factors Affecting their Attraction to Solids -- 2.3.5.1 Cations -- 2.3.5.2 Oxoanions -- 2.3.5.3 CEC -- 2.4 Eh-pH Relations: The Effects of Redox Reactions -- 2.4.1 Eh and pH in Weathering -- 2.5 Observation of Absorption Phenomena for Some Specific Elements in Solution -- 2.5.1 Transuranium Elements -- 2.5.2 Lanthanides -- 2.5.3 Transition and Other Metals -- 2.5.4 Oxides and Oxyhydroxides: Complex Cases -- 2.5.5 Summary -- 2.5.6 Soils and Cation Retention: Clays Minerals Versus Organic Material -- 2.5.7 Surface Precipitation of New Phases -- 2.6 Summary -- 2.6.1 Controlling Factors -- 2.7 Useful References -- Chapter 3: Weathering: The Initial Transition to Surface Materials and the Beginning of Surface Geochemistry -- 3.1 Alteration Processes: Oxidation, Hydration, and Dissolution. , 3.1.1 Air and Water: Interaction of the Atmosphere and Aqueous Solutions -- 3.1.2 Oxidation -- 3.1.3 Hydrolysis -- 3.1.4 Hydration -- 3.1.5 Biological Weathering -- 3.1.6 Rocks and Alterite Compositions -- 3.2 Weathering (Water-Rock Interaction) -- 3.2.1 Initial Stages of Weathering: Major Elements -- 3.2.2 Silicate Mineral Transformations: The Origins of Alteration -- 3.2.3 Rock Alteration: Gain and Loss of Major Elements -- 3.2.4 Rock Types and Element Loss or Gain in the Alterite Material -- 3.2.5 Granite Alterite -- 3.2.5.1 Basalt Alterite -- 3.2.6 Weathering Profiles and the Soil Zone -- 3.2.7 Alterite Chemical Trends -- 3.2.8 End Member Alterite Products: Laterites and Bauxites -- 3.3 Rock Weathering: Minor Elements -- 3.3.1 Major, Minor, and Trace Element Affinities -- 3.3.1.1 Alkali and Alkaline Earth Elements -- 3.3.2 K-Rb -- 3.3.3 Ca-Sr -- 3.3.4 Ca-Ba -- 3.3.5 Li -- 3.3.6 Cs -- 3.3.7 Transition Metal Elements -- 3.3.8 Oxides and Associations of Elements -- 3.3.9 Importance of Oxidation State (Solubility of Oxide) -- 3.3.10 Co -- 3.3.11 Ni -- 3.3.12 Zn -- 3.3.13 Cu -- 3.3.14 V and Cr -- 3.3.15 Some Heavy Trace Elements Bi, Cd, Sb, Sn, Pb, As, Hg -- 3.3.16 Elements in Refractory Phases (Very Low Solubility and High Chemical Stability) -- 3.3.17 Summary of Minor Element Relations -- 3.4 Following the Elements -- 3.5 Useful References -- Chapter 4: Soils: Retention and Movement of Elements at the Interface -- 4.1 Background Setting -- 4.1.1 Soil Development Types -- 4.1.1.1 Immature Soils -- 4.1.1.2 Temperate Climate Soils -- 4.1.1.3 Mature Soils -- 4.1.2 Summary -- 4.2 Chemical Uplift by Plants -- 4.2.1 The Chemical Effects -- 4.2.1.1 Potassium and Silica -- 4.2.1.2 Climate and Chemical Uplift -- 4.2.1.3 Time -- 4.2.2 Elements in Soils -- 4.2.2.1 Fe -- 4.2.2.2 Phosphorous -- 4.2.2.3 Boron -- 4.2.2.4 Transition Metals. , 4.2.3 Correlative Effects -- 4.2.4 Uplift Dynamics -- 4.3 Chemical Controls Engendered by Plants -- 4.3.1 Soil pH -- 4.3.1.1 pH as a Major Factor for Minor Element Cation Retention and Movement in Soils -- 4.3.2 Modelling Cation Absorption to Describe Experimental Observation -- 4.3.2.1 Plant Uplift Action and Minor Elements in Soil Profiles -- 4.3.3 Profiles and Uplift of Minor Elements -- 4.3.3.1 Concentration of Mineral Elements of Minor Abundance by Plants -- 4.3.3.2 Elemental Concentration by Plants Exterior to the Metabolic System -- 4.3.4 Cases of Minor Elements Retention in Soils -- 4.3.4.1 Rare Earth Elements -- 4.3.4.2 Zinc -- 4.3.4.3 Copper -- 4.3.4.4 Arsenic and Antimony -- 4.3.5 Summary -- 4.3.5.1 Movement in Soils -- 4.4 Useful Texts -- Chapter 5: Transport: Water and Wind -- 5.1 Water Transport Materials -- 5.1.1 Materials Present in Transport Waters -- 5.1.2 Alteration Products in Rivers -- 5.1.3 Dissolved Material and Colloidal Material -- 5.1.3.1 Major Abundance Soluble Elements -- Cations Ca, Na, K, Mg -- 5.1.3.2 Elements of Low Solubility -- 5.1.3.3 Soluble Elements, Major and Trace Abundances -- 5.1.3.4 Insoluble Trace Elements -- 5.1.4 Suspended Matter -- 5.1.4.1 Major Elements -- 5.1.4.2 Minor Elements -- 5.1.5 Comparison of Dissolved and Particulate Matter in a River -- 5.1.5.1 Soluble Elements -- 5.1.5.2 Elements of Low Solubility -- Al and Fe -- 5.1.5.3 Minor Elements and Insoluble Elements -- Co-Fe -- 5.1.6 Rivers and Seawater: The Deltas -- 5.1.7 Summary: River Transport -- 5.2 Wind-Borne Materials -- 5.2.1 Types of Loess -- 5.2.1.1 Cold Loess -- 5.2.1.2 Hot Loess -- 5.2.2 Volcanic Ash -- 5.2.2.1 Volcanic Input -- 5.2.2.2 Wind Transport of Special Elements -- Nitrogen -- Mercury -- 5.2.3 ``Human Loess´´ -- 5.2.3.1 Industrial Input -- Sulfur -- Organic Matter -- 5.2.3.2 Gases and Dust Particles: Reactions During Transport. , 5.2.3.3 Radioactive Fallout -- 5.2.4 Summary -- 5.3 Geochemical Alteration of Loess and Volcanic Materials at the Surface and the Effect of Plants -- 5.3.1 Major Elements -- 5.3.2 Minor Elements -- 5.3.3 Soluble Elements -- 5.3.4 Transition Metals and Heavy Elements -- 5.3.5 Summary -- 5.4 Summary: Transport by Wind and Water -- 5.5 Useful References -- Chapter 6: Sediments -- 6.1 Introduction -- 6.2 Freshwater Sedimentation: Lakes and Streams -- 6.2.1 Fe Effect -- 6.2.1.1 Water Column in Freshwater Sedimentation -- 6.2.2 The Ferrous Wheel -- 6.2.2.1 Freshwater Sediments -- 6.2.2.2 Sulfur Effect -- 6.2.2.3 Phosphorous -- 6.2.3 Diagenesis and Migration -- 6.3 Sedimentation in Saltwater and Salt Marshes -- 6.3.1 Fe and S in Salt Marsh Sediments: Oxidation Effects -- 6.3.1.1 Iron -- Oxidation -- Reduction -- 6.3.1.2 Sulfur -- 6.3.1.3 Clay Phases -- 6.3.1.4 Phosphorous -- 6.3.1.5 Uranium in Salt Marsh Sediments -- 6.3.1.6 Mercury in Salt Marshes -- 6.4 Element Concentration -- 6.4.1 Rare Earth Elements in the Alteration-Transportation-Deposition Cycle -- 6.4.2 Sedimentary Iron Deposits -- 6.5 Evaporites and Concentrated Saline Solutions -- 6.5.1 Carbonates -- 6.5.2 Silicates -- 6.5.3 Phosphates -- 6.5.4 Sulfates -- 6.5.5 Salts -- 6.5.6 Oxyonions in the Last Stages of Evaporite Mineral Formation -- 6.5.6.1 Boron -- 6.5.7 Mineral Associations in Evaporite Deposits -- 6.6 Summary -- 6.6.1 Particulate Material Sediments -- 6.6.2 Evaporites and Organically Precipitated Materials -- 6.7 Useful References -- Summary -- Geochemical Cycle at the Surface: Origins of Chemical Change and the Resulting Movement of Elements -- Major Actors in Chemical Change: Water, Air, and Biological Action -- Geochemical Principles -- Chemical Trends of Alteration -- Soils -- Transport of Alterite Materials -- Sedimentation -- Evaporites -- Bibliography.
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  • 2
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Most cellular processes are carried out by multiprotein complexes. The identification and analysis of their components provides insight into how the ensemble of expressed proteins (proteome) is organized into functional units. We used tandem-affinity purification (TAP) and mass spectrometry in a ...
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 115-118 
    ISSN: 0009-2940
    Keywords: Gold complexes ; Bromonium complex ; Halogenonium complex ; Halogen, two-coordinate ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of (R3P)AuX (X = Cl, Br, I) with [(R3P)Au]+ BF-4 obtained from (R3P)AuCl and AgBF4 in tetrahydrofuran, lead to cationic binuclear gold(I) complexes of the general formula ([(R3P)Au]2X}+ BF-4. A number of chloro- (R = Ph, o-Tol, Mes, Bzl, Et), bromo- (R = Ph, o-Tol, Mes) and iodo-bridged (R = Ph, Mes) complexes of this type have been isolated and identified on the basis of their analytical and spectroscopic data. The crystal structure of bis[(triphenylphosphane)gold(I)]bromonium tetrafluoroborate was determined by single-crystal X-ray diffraction. The cations contain two-coordinate bromine atoms with an Au-Br-Au angle of 96.83(3)°.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 105-110 
    ISSN: 0009-2940
    Keywords: Sulfides ; Selenides ; Copper complexes ; Ambidentate ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Triphenylphosphite has been converted into tris(phenylthiomethyl)phosphane (1) by reaction with LiCH2SPh/DABCO, and subsequently into the corresponding sulfide (2) and selenide (3) by treatment with elemental sulfur or selenium, respectively. Ligands 2 and 3 react with copper(I) halides CuX (X = Cl, Br, I) in polar organic solvents to give either 1:1 (X = Cl: 4, 7, X = Br: 5, 8 ) or 1:2 complexes (X = Br: 9, X = I: 6, 10). The crystal structures of five of these complexes have been determined by single crystal X-ray diffraction studies. All compounds of the type [(PhSCH2)3P=S/Se]CuX (X = Cl, Br) form centrosymmetrical dinuclear complexes featuring a four-membered ring core Cu2[S/Se], fused to two five-membered rings Cu[S/Se]PCS through common trans edges. Only one of the three phenyl-thiomethyl functions is involved in coordination to a metal center. The compound [(PhSCH2)3P=S](CuI)2 (6) is associated into a centrosymmetrical tetranuclear complex containing two four-membered rings (ICu2S) bridged via iodine atoms in 1,3-cis positions. The ligand is found to employ two of its PhSCH2 functions for metal coordination, giving rise to two five-membered rings fused to the four-membered rings via neighbouring edges. In all cases, therefore, the P=S/Se functions of the ligands are the preferred donor sites, which are used for the building of bridgehead structural units of polynuclear complexes.
    Additional Material: 5 Ill.
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  • 5
    ISSN: 0009-2940
    Keywords: Gold ; Phosphanes ; Phosphaneimines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [Tris(dimethylamino)phosphane]gold(I) chloride, μ-tris-{[tris(dimethylamino)phosphane]gold(I)}oxonium tetrafluoroborate, {μ3-tris(dimethylamino)phosphaneimidotris[tris(dimethylamino)phosphane]gold(I)}(2+) bis(tetrafluoroborate) and N-trimethylsilyltris(dimethylamino)phosphaneimine were prepared using modifications of established procedures. Their structures were determined in single-crystal X-ray diffraction studies. The ligand (Me2N)3P, here introduced into gold(I) chemistry for the first time, lends high stability to these compounds through efficient steric shielding of the reaction sites and through a balanced electronic substituent effect. The structural details of the (Mr2N)3P groups are of current interest because of the unusual nonequivalent configuration of the nitrogen atoms in the dimethylamino groups. This behaviour has been observed for most of the (Me2N)3P units in the compounds studied in this work.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1423-1426 
    ISSN: 0009-2940
    Keywords: Gold ; Gold(I) complexes ; (Imine)gold(I)complexes ; Ketiminophosphanes ; (Ketiminophosphane)gold(I) complexes ; Ketiminophosphane sulfides ; (Ketiminophosphanesulfide)gold(I) complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of chloro(dimethyl sulfide)gold(I) with equivalent quantities of the ketiminophosphane diphenyl(diphenylmethyleneamino)phosphane (1a) or its sulfide (1aS) lead to high yields of stable, crystalline 1 : 1 complexes with AuCl units attached to the phosphorus and sulfur atom, respectively. Tris(diphenylmethyleneamino)phosphane (1c) gives the related complex (Ph2C=N)3PAuCl with the gold atom also selectively P-bound. Bis(diphenylmethyleneamino)phenyl-phosphane (1b) could not be used because of its limited stability. Single-crystal X-ray diffraction studies have shown that there is no auxiliary coordination of the metal center by the imino functions of the ligands. The geometry of the P/S—Au—Cl moieties deviates only very slightly from linearity. The angle at the sulfur atom in (Ph2C=N)Ph2PSAuCl is very small [94.30(3)°], but despite of the resulting rather open coordination there are no discernible intra- or intermolecular contacts in the lattice. Such contacts are also absent with (Ph2C=N)Ph2PAuCl and (Ph2C=N)3PAuCl owing to the bulk of the ligands. The 1 : 1 complexes do not react with an excess of (Me2S)AuCl. This finding, and the molecular structures of the 1 : 1 complexes, show very consistently that both phosphane and sulfide donors are far superior as ligands for gold(I) as compared to ketimine donor molecules.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 1417-1422 
    ISSN: 0009-2940
    Keywords: Gold ; N ligands ; Gold(I) complexes ; (Imine)gold(I) complexes ; Guanidines ; Ketimines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (Tetramethylguanidine)gold(I) chloride (1) and bromide (2) are readily prepared in high yield from (Me2N)2C=NH and [AuCl(Me2S)] or [AuBr(tht) (tht = tetrahydrothiophene), repectively. NMR spectra of chloroform solutions of the two products indicate equilibria of the type 2 LAuX = L2Au+AuX2-. The cationic complex [Au(NH=C(NMe2)2)(PPh3)]+ is obtained as the triflate salt 3 from tetramethylguanidine and [Au(PPh3)]+O3SCF3-. In solution at low temperature (-60°C), this compound adopts a rigid structure whereby the NMe2 groups are rendered non-equivalent, but at ambient temperature there is coalescence of the NMe2 signals in the 1H- and 13C-NMR spectra. The related benzophenoneimine complex [Au{NH=CPh2}(PPh3)]+BF4- (4), which was synthesized as a reference3 compound, exhibits similar behaviour. In solution at low temperature (-60°C) the two phenyl rings of the ligand are diastereotopic. In contrast, the triisopropylphosphane derivative [Au[NH=CPh2](PiPr3)]+BF4- (5) is rigid on the NMR time scale, even at 25°C. Thbe solid-state structures of 2, 3, 4, and 5 have been determined by single-crystal X-ray diffraction. Compound 2 crystallizes in the ionic form with discrete Au … Au bonded ion pairs [Au[NH=C(NMe2)2]2]+ [AuBr2]- [Au … Au 3.1413(8) Å]. The cations of 3, 4, and 5 show the [Au(PPh3)]+ units N-coordinated to the imino groups, with the nitrogen atoms in a trigonal-planar configuration.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 947-950 
    ISSN: 0009-2940
    Keywords: Copper ; N ligands ; Copper(I) complexes ; (Imine)copper(I) complexes ; Ketimines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of [(MeCN)4Cu]BF4 with two or three equivalents of benzophenoneimine lead to the formation of [(Ph2C=NH)2]BF4 (1) and [ (Ph2C=NH)3Cu]BF4 (2), respectively. A further equivalent of the ligand does not coordinate to the cation of complex 2. The crystal structures of both compounds were determined. 1 shows a linearly two-coordinated copper(I) center with a Cu-N distance of 1.877(2) Å. In compound 2 a distorted trigonal planar coordination of copper is observed with N-Cu-N angles of 114.5(2), 112.9(2) and 132.4(2)°, corresponding to two nearly equal Cu-N distances [Cu-N2 1.947(5) and Cu-N3 1.934(5) Å] dnd a significantly longer third one (Cu-N1 2.011(5) Å]. A comparison of these data with recently determined structures of bis(benzophenoneimine)silver(I) and -gold(I) complexes shows that the covalent radii of the monovalent coinage metals decrease in the order Ag(I) 〉 Au(I) 〉 Cu(I).
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 955-958 
    ISSN: 0009-2940
    Keywords: Phosphane sulfides ; Gold(I) complexes ; Sulfide coordination ; Phosphorus ; Sulfur ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Treatment of the ditertiary phosphane sulfides (CH2)n[PPh2S]2, 1a-1d, n = 1-4, with equivalent amounts of (dimethylsulfide)gold(I) chloride (Me2S)AuC1 affords the dinuclear complexes 2a-2d with an AuCl unit attached to each sulfur atom. The chlorides can be converted into the bromides 3a-3c by metathesis using KBr, or by reacting 1d with (tetrahydrothiophene)gold bromide. With [(Ph3P)Au]+ O3SCF3 as the aurating agent for the diphosphane disulfides, the corresponding dicationic products are obtained: {(CH2)n[SPPh2AuPPh3]2}2+ · 2 O3SCF3 (4b-4d, n = 2-4). An excess of the reagents does not lead to polygold clustering at the sulfur atoms, and P-S cleavage occurs instead to give sulfonium salts {S[Au(PPh3)]3}+ X-. The reaction of Ph3PS with equimolar quantities of [ (Ph3P)Au]O3SCF3 leads to the cationic 1:1 complex 5, and with an excess of the agent the P-S bond is ruptured. The structures of compounds 4b and 4d were determined by single-crystal X-ray diffraction. The dications have crystallographic centers ot inversion, the coordination at the gold atoms is linear [4b: 179.03(3)° 4d: 175.29(2)°] and the angles at the sulfur atoms are acute [4b: 97.76(4)° 4d: 96.37(3)°], but there are no short Au-Au contacts.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 12 (1996), S. 965-975 
    ISSN: 0749-503X
    Keywords: act1-1 ; SAC3 ; ConA-labelling ; Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: A temperature-sensitive mutation (act1-1) in the essential actin gene of Saccharomyces cerevisiae can be suppressed by mutations in the SAC3 gene. A DNA fragment containing the SAC3 gene was sequenced. SAC3 codes for a 150 kDa hydrophillic protein which does not show any significant similarities with other proteins in the databases. Sac3 therefore is a novel yeast protein. A nuclear localization of Sac3 is suggested by the presence of a putative nuclear localization signal in the Sac3 sequence. A SAC3 disruption mutation was constructed. SAC3 disruption mutants were viable but grew more slowly and were larger than wild-type cells. In contrast to the sac3-1 mutation, the SAC3 disruption was not able to suppress the temperature sensitivity and the osmosensitivity of the act1-1 mutant. This demonstrates that act1-1 suppression by sac3-1 is not the result of a simple loss of SAC3 function. Furthermore, we examined the act1-1 and the sac3 mutants for defects in polarized cell growth by FITC-Concanavalin A (Con A)-labelling. The sac3 mutants showed a normal ConA-labelling pattern. In the act1-1 mutant, however, upon shift to non-permissive temperature, newly synthesized cell wall material, instead of being directed towards the bud, was deposited at discrete spots in the mother cell.
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