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  • 1
    Electronic Resource
    Electronic Resource
    Single-crystal and powder EPR study on tetra-n-butylammonium bis(2-thioxo-1,3-dithiole-4,5-diselenolato)cuprate(II), (n-Bu4N)2[63Cu(dsit)2], doped into (n-Bu4N)2[Ni(dsit)2] (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 4073-4076 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00345a032
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  • 2
    Electronic Resource
    Electronic Resource
    The U5.0 Undulator for the Advanced Light Source : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 359-362 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The U5.0 Undulator, an 89 period, 5 cm period length, 4.6 m long insertion device has been designed, is being fabricated, and is scheduled for completion in early 1992. This undulator will be the first high brightness source, in the 50 to 1,500 eV range, for the Advanced Light Source at the Lawrence Berkeley Laboratory. A hybrid magnetic configuration using Nd–Fe–B permanent magnet material and vanadium permendur poles has been selected to achieve the field quality needed to meet performance requirements. The magnetic structure is modular with each half consisting of five assembly sections, which provide the periodic structure, and end structures, for entrance and exit correction, mounted on a steel backing beam. Each assembly section consists of 35 half-period pole assemblies bolted to a mount. The required 0.837 T effective peak field at a 1.4 cm gap has been verified with model measurements. Vertical field integral correction is accomplished with the end structures, each having an arrangement of permanent magnet rotors which will be adjusted to minimize electron beam missteering over the undulator operating field range. To reduce the effect of environmental fields, the steel backing beams are connected through parallel, low-reluctance, Ni–Fe hinges. The magnetic structure is connected through four rollernuts to the drive system that provides gap adjustment with an arrangement of roller screws, chain drives, a gear reduction unit, and a stepper motor driven by a closed loop control system. Magnetic structure and drive system support are from a 2.4 m high structure which includes a support base with four vertical supports. The vacuum chamber design is a two-piece machined and welded 5083-H321 aluminum construction of 5.1 m length. Pumping is with a combination of ion, titanium sublimation pump and nonevaporable getter pumps. Magnetic design, subsystem design, and fabrication progress are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142755
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of tetrakis(tetraethylammonium) hexakis(1,1-dicyanoethylene-2,2-diselenolato-Se,Se')octacuprate (1991)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 2041-2043 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270191004699
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  • 4
    Electronic Resource
    Electronic Resource
    1-Amino-4-aryl-2(1H)-pyrimidinthione: Acidität und Komplexbildung mit Mn(II), Co(II), Ni(II), Zn(II), Cd(II), Pb(II) und Ag(I) (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 500-505 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1-Amino-4-aryl-2(1H)-pyrimidinethiones: Acidity and Complex Formation with Nonferrous Metal Ions and Ag(I)Acid dissociation constants of new 2, 3 and already known 1 substituted 1-amino-4-aryl-2(1H)-pyrimidinethiones and stability constants of their nonferrous metal ion and silver complexes have been measured pH-potentiometrically in a 75% (v/v) mixture of dioxane/water. The influence of the substituents on pKa- and lgβn-values is discussed. The X-ray structure analysis of bis[1-(4-toluenesulfonamido)-4-(4-tolyl)-2(1H)-pyrimidinethionatol]-nickel(II)5 proves that pyrimidinethiones coordinate via their thione sulphur and aminonitrogen. However, the bond lengths are not levelled in the chelating ring.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360604
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  • 5
    Electronic Resource
    Electronic Resource
    Kristall- und Molekülstruktur des 4,5-Dibenzoylseleno-1,3-diselenol-2-selonHerrn Prof. Dr. Rolf Borsdorf zum 60. Geburtstag gewidmet (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 72-75 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystal and Molecular Structure of 4,5-Dibenzoylseleno-1,3-diselenole-2-seloneThe crystal and molecular structure of 4,5-dibenzoylseleno-1,3-diselenole-2-selone is described. The compound crystallizes in the monoclinic space group P21/c with a = 9.704, b = 10.839, c = 17.726 [Å], β = 93.43° and Z = 4. The structure is compared with that of the analogous „all-sulfur“ compound. The crystal packing of the heterocycle studied shows surprisingly short intermolecular distances between neighbouring selone groups.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340113
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  • 6
    Electronic Resource
    Electronic Resource
    1,3-Dithiol-anellierte Kronenverbindungen (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 177-179 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3-Dithiole Annelated Crown Compounds
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360217
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  • 7
    Electronic Resource
    Electronic Resource
    Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 580 (1990), S. 167-174 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III)The crystal and molecular structure of tris(1,1-diethyl-3-benzoyl-thioureato)-ruthenium(III) has been determined by an X-ray structure analysis. The compound crystallizes in the trigonal space group P3 with a = 16.556, c = 8.476 Å and Z = 2. The structure was solved by Patterson methods and refined to a final R value R = 0.074 for 801 observed reflections. The molecule has the symmetry C3. The coordination polyhedron is an octahedron with facial arrangement of the ligator atoms. The Ru—S and Ru—O distances are 2.293 Å and 2.047 Å, respectively.
    Notes: Die Kristall- und Molekülstruktur von Tris(1,1-diethyl-3-benzoyl-thioureato)ruthenium(III) wurde durch Röntgenkristallstrukturanalyse bestimmt. Die Verbindung kristallisiert trigonal in der Raumgruppe P3 mit den Gitterkonstanten a = 16,556, c = 8,476 Å und Z = 2. Die Struktur wurde mittels Patterson-Methoden gelöst und bis zu einem abschließenden R-Wert R = 0,074 für 801 beobachtete Reflexe verfeinert. Das Molekül besitzt die Symmetrie C3. Das Koordinationspolyeder ist ein Oktaeder mit facialer Anordnung der Ligator-Atome. Die Ru—S- und Ru—O-Abstände betragen 2,293 Å bzw. 2,047 Å.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905800120
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  • 8
    Electronic Resource
    Electronic Resource
    Komplexe mit Dimethyltetrathiooxalat: Struktur und Eigenschaften von [Ni(S2C2(SMe)2)2] und [Pd(S2C2(SMe)2)(PPh3)2] (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 588 (1990), S. 167-180 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structure and Properties of Homo- and Mixed-Ligand Bis-Complexes of Dimethyltetrathio-oxalate: [Ni(S2C2(SMe)2)2] and [Pd(S2C2(SMe)2) (PPh3)2][Ni(S2C2(SMe)2)2] was prepared photochemically under inert conditions from Ni(CO)4 and dimethyltetrathio-oxalate (ttoMe2) whereas [Pd(S2C2(SMe)2)(PPh3)2] was obtained thermally from Pd(PPh3)4 and ttoMe2 (beneath little [Pd(S2C2(SMe)2)2] as byproduct). In both neutral chelates the ligands are coordinated square planar round the metal atoms (space group for Ni complex C2/m, for Pd complex P1). From its electronic spectra, the IR, and cyclovoltammetric data the homo-ligand Ni complex can be interpreted as a dithiolene chelate. The mixed-ligand Pd complex shows interligand charge-transfer transitions. The Ni complex is an oxidant.
    Notes: Die Synthese von [Ni(S2C2(SMe)2)2] gelang photochemisch unter Inertbedingungen aus Ni(CO)4 und Dimethyltetrathiooxalat (ttoMe2) und von [Pd(S2C2(SMe)2)(PPh3)2] thermisch aus Pd(PPh3)4 und ttoMe2 (daneben fällt wenig [Pd(S2C2(SMe)2)2] an). In beiden Neutralchelaten sind die Liganden quadratisch-planar um Ni (Raumgruppe C2/m) bzw. Pd (Raumgruppe P1) koordiniert. Elektronenspektrum, IR-Daten und Cyclovoltammogramm lassen den reinligandigen Ni-Komplex als Dithiolenchelat interpretieren. Im gemischtligandigen Pd-Komplex treten Interligand-charge-transfer-Übergänge auf. Der Ni-Komplex wirkt oxydierend.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905880120
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  • 9
    Electronic Resource
    Electronic Resource
    Hydrophil substituierte N-Acyl-thioharnstoffe  -  Säurestärke und Komplexstabilität in Dioxan/WassergemischenProfessor Kurt Dehnicke zum 60. Geburtstage gewidmet (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 595 (1991), S. 35-43 
    Details
    ISSN: 0044-2313
    Keywords: Copper, nickel complexes of N-acyl-thiourea derivatives ; acid dissociation constants ; complex stability constants ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrophilic Substituted N-Acyl-thioureas  -  Acidity and Stability of Complexes in Dioxane/Water MixturesSome derivatives of N-acyl-thioureas containing hydroxy, ester or sulfonic acid groups as well as their copper(II) and nickel(II) complexes have been synthesized. Acid dissociation constants and complex stability constants have been measured pH-potentiometrically in dioxane/water mixtures ranging from 75 to 0% (v/v) dioxane involving main group and subgroup metal ions as well. The partially remarkable changes of the constants in varied solvent mixtures are discussed.
    Notes: Eine Reihe N-Acyl-thioharnstoffe mit Hydroxy-, Ester- oder Sulfonsäuregruppen und ihre Kupfer(II)- und Nickel(II)-Komplexe wurden erstmals synthetisiert und ihre Säuredissoziationskonstanten pH-potentiometrisch in Dioxan/Wassergemischen (Dioxangehalt 75 - 0 Vol.-%) bestimmt. Die Stabilitätskonstanten der Komplexe mit 1-, 2- und 3-wertigen Metallionen aus Haupt- und Nebengruppen des PSE wurden ebenfalls ermittelt. Die z. T. drastischen Veränderungen der Konstanten bei Variation der Lösungsmittelzusammensetzung werden diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915950106
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Koordinationschemie des 1,3-Dithiol-2-selon-4,5-diselenolats (dsise) und des 1,3-Dithiol-2-selon-4,5-dithiolats (dmise). Kristall- und Molekülstruktur des Tetrabutylammonium-bis-(1,3-dithiol-2-selon-4,5-diselenolato)nickelat(II) und -(III), [(n-C4H9)4N]2[Ni(dsise)2] und (n-C4H9)4N[Ni(dsise)2] (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 609 (1992), S. 103-116 
    Details
    ISSN: 0044-2313
    Keywords: Metal(II), -(III) bis-chelates (Bu4N)n[M-(dsise)2] ; (dsise) — 1,3-dithiole-2-selone-4,5-diselenolate ; i. r., 13C n.m.r., e.p.r., cyclovoltammetric data ; ab-initio SCF calculations ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Coordination Chemistry of 1,3-Dithiole-2-selone-4,5-diselenolate (dsise) and 1,3-Dithiole-2-selone-4,5-dithiolate (dmise). Crystal and Molecular Structure of Tetrabutylammonium bis(1,3-dithiole-2-selone-4,5-diselenolato)nickelate(II) and -(III), [(n-C4H9)4N]2[Ni(dsise)2 and (n-C4H9)4[Ni(dsise)2]Syntheses and properties of metal(II) and metal(III) bis-chelates of 1,3-dithiole-2-selone-4,5-diselenolate (dsise), of the general type (Bu4N)n)M(dsise)2] (n =2 : M = Zn, Cd, Hg, Cu, Ni, Pd; n = 1: M = Ni, Au) are reported and compared with chelates of the isologue 1,3-dichalcogenole-2-chalcogenoe-4,5-dichalcogenolate (i. r., 13C-n. m. r., e. p. r., cyclovoltammetric data). The unexpected rearrangement during the syntheses of dsise and 1,3-dithiole-2-selone-4,5-diselenolate (dmise) is characterized by ab-initio SCF calculations. The x-ray structures of (Bu4N)2[Ni(dsise)2] (space group P21/c, a = 8.5556(13) Å, b = 15.0009(12) Å, c = 19.696(3) Å, β = 96.018(7)°, V = 2513.9(5) Å3, Z = 2) and Bu4N[Ni(dsise)2] (space group C2/c, a = 25.133(6) Å, b = 9.828(4) Å, c = 18.104(7) Å, β = 132.81(1)°, V = 3281(2) Å3, Z = 4) are given.
    Notes: Synthese und Eigenschaften von Metall(II) und Metall(III) Bis-Chelaten des 1,3-Dithiol-2-selon-4,5-diselenolats (dsise) vom Typ (Bu4N)n[M(dsise)2](n = 2: M = Zn, Cd, Hg, Cu, Ni, Pd; n = 1:M = Ni, Au) werden beschrieben und im Vergleich mit isologen 1,3-Dichalkogenol-2-chalkogenon-4,5-dichalkogenolat-Chelaten diskutiert (IR, 13C-NMR, EPR, Cyclovoltammetrie). Anhand von ab-initio-SCF-Rechnungen wird die bei der Synthese des dsise und des 1,3-Dithiol-2-selon-4,5-dithiolats (dmise) auftretende „Umlagerung“ charakterisiert. Die röntgenkristallographischen Daten von (Bu4N)2[Ni(dsise)2] (Raumgruppe P21/c, a = 8,5556(13) Å, b = 15,0009(12) Å, c = 19,696(3) Å, β = 96,018(7)°, V = 2513,9(5) Å3, (Z = 2) und von Bu4N[Ni(dsise)2] (Raumgruppe C2/c, a = 25,133(6) Å, b = 9,828(4) Å, c = 18,104(7) Å, β = 132,81(1)°, V = 3281(2) Å3, Z = 4) werden vorgestellt.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926090320
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