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  • 1980-1984  (12)
  • 1
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 935-937 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 941-943 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 683-684 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 36 (1980), S. 974-977 
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 38 (1982), S. 809-811 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary It was observed that in the fishCoris julis L., in its natural environment, both primary and secondary males take part in reproduction. Chromosome studies showed 23 homologous chromosome pairs, which are identical in males and females, and a variable 24th pair. The heteromorphism of this pair is identical in secondary males and in the majority of females; these are presumably the females that can undergo sex inversion. Primary males show a different heteromorphism of the same pair.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 18 (1980), S. 493-500 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé On a suivi, par TG et ATD sous N2, dans l'intervalle de températures allant de l'ambiante jusqu'à 450°, la décomposition de Pb(CH3COO)2 · 3 H2O dont on a caractérisé les produits par des méthodes analytiques. PbO est le principal produit final solide, en dehors duquel il ne se forme essentiellement que du Pb. Comme produits intermédiaires solides, on a trouvé, à part Pb(CH3COO)2, les acétates basiques Pb(CH3COO)3. PbO et Pb(CH3COO)2 · · 2 PbO qui ont été identifiés par analyse de poudres aux rayons X. Ces acétates basiques se sont formés, par décomposition isotherme, respectivement à 240 et à 305°. Parmi les produits de décomposition volatils décelés par GC et MS et dosés par des méthodes quantitatives, CO3 et l'acétone sont les composants principaux. On montre les différents modes de formation des autres produits, comme CH3COOH, (CH3CO)3O, l'acétylacétone et le cétène formé transitoirement.
    Abstract: Zusammenfassung Die Zersetzung von Pb(CH3COO)3 · 3 H3O wurde im Bereich von Raumtemperatur bis 450° unter N3 mittels TG, DTA verfolgt und die Produkte wurden analytisch charakterisiert. PbO ist das hauptsächliche feste Endprodukt, neben dem im wesentlichen nur Pb entsteht. Als feste Zwischenprodukte wurden neben Pb(CH3COO)3 die basischen Acetate Pb(CH3COO)2 · PbO und Pb(CH3COO)2 · 2 PbO gefunden und durch Röntgenpulveraufnahmen identifiziert; diese basischen Acetate wurden durch isotherme Zersetzung bei 240 bzw. 305° dargestellt. Unter den durch GC und MS erfaßten und quantitativ bestimmten flüchtigen Zersetzungsprodukten sind CO2 und Aceton Hauptbestandteile. Verschiedene Bildungsweisen der übrigen Produkte, CH3COOH, (CH3CO)2O, Acetylaceton und des Zwischenproduktes Keten werden aufgezeigt.
    Notes: Abstract The decomposition of Pb(CH3COO)3 · 3 H2O under N2 has been studied by TG and DTA between room temperature and 450° and the products have been characterized analytically. PbO is the main solid product, besides which essentially only Pb is produced. As solid intermediates, aside from Pb(CH3COO)3 the basic acetates Pb(CH3COO)2 · PbO and Pb(CH3COO)2 · 2 PbO have been found and identified via their X-ray powder diagrams; these basic acetates have been prepared by isothermal decomposition at 240 and 305°, respectively. Among the volatile decomposition products analyzed by GC and MS and determined quantitatively, CO2 and acetone are the main products. Different routes for the formation of the other products, CH3COOH, (CH3CO)2O, acetylacetone and the intermediate ketene are shown.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 477 (1981), S. 101-107 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation, Crystal and Molecular Structure of 2 (C6H5)3PO · (COOH)22(C6H5)3PO · (COOH)2 crystallizes from a solution of oxalic acid and (C6H5)3PO in methanol. Crystal data: space group P21/c (monoclinic) with a = 907.4(2), b = 1035.4(3), c = 1797.9(8) pm, β = 75.20(1)° and Z = 2; d (calc./obs.) = 1.27/1.31 g cm-;3; Vcell = 1633.1 × 106 pm3. The structure was determined by direct methods from 3006 independent reflections and has been refined by full matrix least squares to R = 0.049. In the compound one molecule of trans-oxalic acid and two symmetrically dependent (C6H5)3PO units are linked by short O…H-O bridges distances and angles see above.
    Notes: 2(C6H5)3PO · (COOH)2 kristallisiert aus einer Lösung von Oxalsäure und (C6H5)3PO in Methanol. Kristalldaten: Raumgruppe P21/c (monoklin) mit a = 907,4(2), b = 1035,4(3), c = 1797,9(8) pm, β = 75,20(1)° und Z = 2; d (ber./gef.) = 1,27/1,31 g · cm-3; VZelle = 1633,1 · 106 pm3. Die Struktur wurde anhand von 3006 unabhängigen Reflexen direkt bestimmt und nach der Kleinsten-Quadrate-Methode (volle Matrix) bis zu einem R-Wert von 0,049 verfeinert. In der Verbindung ist ein Molekül trans-Oxalsäure mit zwei symmetrisch abhängigen (C6H5)3PO-Einheiten über kurze O…H-O-Brücken verknüpft. Abstände: P-O(1) 149,6(3); O(1)…O(2) 255,0(4); O(2)-C(19) 128,5(5); O(3)-C(19) 120,9(5) pm. Winkel: P-O(1)…O(2) 130,6(2)°;O(1)…O(2)-C(19) 116,2(2)°.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bismuth(III) Complexes of 3,4,5,6-Tetrahydropyrimidine-2(1H)-thione and Benzimidazole-2(3H)-thione. Crystal and Molecular Structure of Trichloro-tris(3,4,5,6-tetrahydropyrimidine-2(1H)-thione)bismuth(III)Bismuth(III) compounds BiX3 (X = Cl, Br, NO3) and 3,4,5,6-tetrahydropyrimidine-2(1H)-thione (THPT) or benzimidazole-2(3H)-thione (BIT) react in acid medium to give complexes BiX3 · 3 THPT and BiX3 · 4 BIT · 4 H2O, while Bi(ClO4)3 leads to Bi(ClO4)3 · 5 THPT and Bi(ClO4)3 · 5 BIT.BiCl3 · 3 THPT crystallizes monoclinic [space group P21/n; a = 1 241.8(5), b = 1 283.0(5), c = 1 420.4(5) pm, β = 84.45(5)°; Z = 4; d (calc) 1.96 g · cm-3; Vcell = 2252 · 106 pm3; structure determination from 2999 independent reflexions by the heavy atom method; refinement by full matrix least squares to R = 0.039], Bi is coordinated in a distorted octahedral way by three Cl [distances Bi—Cl: 266.9(5), 275.7(4), 278.4(4) pm] and by three THPT through S [Bi—S: 274.1(4), 277.9(4), 287.6(5) pm], however the 6s pair seems to be stereochemically insert. Angles (mean values): Cl—Bi—Cl 94.7(2)°, Cl—Bi—S 92.3(2)° and 168.7(1)°, S—Bi—S 80.0(1)°. Vibrational data of the solid compounds show the neutral ligands to coordinate in all complexes through S to Bi; in the cases X = NO, and C10, the data indicate the presence of covalent and ionic nitrate and perchlorate and also an ionic structure. In methanol solution the complexes are non-electrolytes (X = C1, Br), 1: l-electrolyte8 (X = NO3) or 1: 2-electrolytes (X = C104).
    Notes: Bismut(III)-Verbindungen BiX3 (X = Cl, Br, NO3) reagieren in saurem Milieu mit 3,4,5,6-Tetrahydropyrimidin-2(1H)-thion (THPT) bzw. Benzimidazol-2(3H)-thion (BIT) zu den Komplexen BiX3 · 3 THPT bzw. BiX3 · 4 BIT · 4 H2O, während Bi(ClO4)3 zu Bi(ClO4)3 · 5 THPT bzw. Bi(ClO4)3 · 5 BIT führt.BiCl3 · 3 THPT kristallisiert monoklin [Raumgruppe P21/n; a = 1 241,8(5), b = 1 283,0(5), c = 1 420,4(5) pm, β = 84,45(5)°; Z = 4; d (ber) 1,96 g · cm-3; VZelle = 2252 · 106 pm3; Strukturbestimmung anhand von 2999 unabhängigen Reflexen nach der Schweratommethode; Verfeinerung nach der Kleinste-Quadrate-Methode (volle Matrix) bis R = 0,039], Bi wird verzerrt oktaedrisch von drei Cl [Abstände Bi—Cl: 266,9(5), 275,7(4), 278,4(4) pm] und von drei THPT über S [Bi—S: 274,1(4), 277,9(4), 287,6(5) pm] koordiniert, jedoch scheint das 6s-Paar stereochemisch inert zu sein. Winkel (gemittelt): Cl—Bi—Cl 94,7(2)°, Cl—Bi—S 92,3(2)° und 168,7(1)°, S—Bi—S 80,0(1)°. Schwingungsspektroskopische Daten der festen Verbindungen zeigen, daß die Neutralliganden in allen Komplexen über S an Bi koordiniert sind; im Falle X = NO3 und ClO4 lassen sie auf Vorliegen von kovalent und von ionisch gebundenem Nitrat bzw. Perchlorat und damit ionische Struktur schließen. In methanolischer Lösung liegen die Komplexe als Nichtelektrolyte (X = Cl, Br), als 1:1-Elektrolyte (X = NO3) bzw. 1:2-Elektrolyte (X = ClO4) vor.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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