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  • Chemistry  (78)
  • SPACECRAFT INSTRUMENTATION  (2)
  • 2020-2021
  • 1980-1984  (77)
  • 1950-1954  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von BaHg(CN)4 · 4 PyridinProfessor Walter Rüdorff zum 75. Geburtstage am 3. Oktober 1984 gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 516 (1984), S. 30-34 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of BaHg(CN)4 · 4 PyridineThe structure of the tetragonal BaHg(CN)4 · 4 Pyridine (space group I4, a = 1119.4(7), c = 1 057.9(7) pm, Z = 2, dc = 1.87 g · cm-3) contains tetrahedral Hg(CN)4 and bisdisphenoide Ba(NC)4(py)4 groups, which are linked together by Hg—CN—Ba bridges. The BaHg(CN)4 framework consists of a 3-dimensional network of all round edge-sharing tetrahedrons. The analogous strontium compound is isotype with a = 1 108.2(9) and c = 1 035.3(14) pm.
    Notes: In der Struktur des tetragonalen BaHg(CN)4 · 4 Pyridin (Raumgruppe I4, a = 1119,4(7), c = 1 057,9(9) pm, Z = 2, dc = 1,87 g · cm-3) sind tetraedrische Hg(CN)4- und bisdisphenoide Ba(NC)4(py)4-Gruppen über Hg—CN—Ba-Brücken zu einem Raumnetz verknüpft. Dem BaHg(CN)4-Gerüst liegt ein Aufbau aus allseitig eckenverknüpften Tetraedern zugrunde. Die analoge Strontium-Verbindung ist isotyp mit a = 1 108,2(9) und c = 1 035,3(14) pm.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845160905
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  • 2
    Electronic Resource
    Electronic Resource
    Liquid-chromatographic determination of rate constants for the cellulose-dimethyloldihydroxyethyleneurea reaction (1982)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 27 (1982), S. 1131-1138 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Rates of the MgCl2-catalyzed reaction between cellulose and 4,5-dihydroxy-1,3-bis(hydroxymethyl)-2-imidazolidinone were measured at 70, 90, and 110°C. The rate constants were determined by curing the resin for various times, extracting the unreacted resin, and determining its concentration by liquid chromatography. The energy of activation was calculated from the rate data. This work confirms the pseudo-first-order behavior of this reaction.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1982.070270403
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  • 3
    Electronic Resource
    Electronic Resource
    Formaldehyde release from a model N-methylol system (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3569-3577 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A model N-methylol reactant system based on pyrrolidone derivatives has been used to study the chemical factors that control formaldehyde release. Fabric samples of known composition were prepared from chemically pure reactants and formaldehyde release was determined by the AATCC Sealed Jar Test. This work provides support for prior suggestions and a more direct approach for understanding unexpected results from tests on post-and precure fabrics. In addition, new findings demonstrate that the N-methylol reactant, its byproducts, and pure zinc nitrate are capable of reducing the level of formaldehyde release.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291130
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  • 4
    Electronic Resource
    Electronic Resource
    A new integral approximation formula for kinetic analysis of nonisothermal TGA data (1984)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 30 (1984), S. 517-519 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690300332
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  • 5
    Electronic Resource
    Electronic Resource
    Reagent residues on N-methylopyrrolidone-treated cotton (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3579-3585 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Residues remaining after drying and curing cotton fabric with either sodium bisulfate or zinc nitrate and N-methylolpyrrolidone, a monofunctional model durable press agent, have been quantitated by high performance liquid chromatography. The residues were identified as pyrrolidone, N-methylolpyrrolidone, N,N′-methylene-bis-2-pyrrolidone, and N,N′-(oxydimethylene)bis-2-pyrrolidone. The two catalysts fixed approximately the same amount of the N-methylolpyrrolidone to cellulose, but generated different ratios of the extractable residues. A comparison of the levels of these residues that are capable of releasing formaldehyde is given. The dominant residue from the NaHSO4 treatment was N-methylolpyrrolidone, while zinc nitrate generated more N,N′-(oxydimethylene)bis-2-pyrrolidone.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291131
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Verseifung aromatischer SulfochlorideHerrn Professor Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 36-40 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on the Hydrolysis of Aromatic SulfochloridesThe hydrolysis of aromatic sulfochlorides can bei described by a second-order law. Due to the strength of the base the constants of velocity are between 10-6 (H2O) or 103 (OH-) 1 mol -1 s-1 respectively. The reaction of benzensulfochlorides proceeds according to an addition-elimination mechanism, whereas benzylic sulfochlorides, reacting with a strong base, proceed to an elimination-addition mechanism.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250105
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  • 7
    Electronic Resource
    Electronic Resource
    Neue Hochdruckmodifikationen im RhF3-Typ bei Seltenerd-Trichloriden (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 498 (1983), S. 75-84 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Novel High Pressure Modifications of Rare Earth Trichlorides in the RhF3-TypeThe results of high pressure investigations on Rare Earth trichlorides crystallizing with the AlCl3-type arrangement under normal conditions are reported. In addition to the PuBr3-type geometry, formed at higher pressures, a new structure type is found in a lower pressure range. This high pressure phase is isotypic with the RhF3-type arrangement, which so far has only been found with fluorides. It is packed more efficiently and shows a slightly higher primary coordination due to the higher symmetry of the coordination polyhedra compared with that of the original AlCl3-type structure. We present a model for the mechanism of transformation.
    Notes: Wir berichten über Hochdruckversuche an Seltenerd-Trichloriden, die unter Normalbedingungen im AlCl3-Typ kristallisieren. Zusätzlich zu dem bei höheren Drücken gefundenen PuBr3-Typ tritt in mittleren Druckbereichen eine neue Struktur auf, deren Isotypie zum RhF3-Typ durch eine Röntgenstrukturanalyse nachgewiesen werden konnte und die unter Normalbedingungen bislang nur bei Fluoriden beobachtet wurde. Sie stellt eine dichtere Packung dar und zeigt eine höhere Primärkoordination durch Symmetrisierung. Wir diskutieren ein Modell für den Verlauf der strukturellen Reorganisation.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834980310
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  • 8
    Electronic Resource
    Electronic Resource
    Der PuBr3-Typ als Hochdruckmodifikation bei Seltenerd-Trihalogeniden LnX3 (X = Cl, Br, I) (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 178-184 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: PuBr3 Type as High Pressure Modification of Rare Earth Trihalides LnX3 (X = Cl, Br, I)High pressure experiments in a belt-type apparatus were performed on rare earth trichlorides, -bromides and -iodides. The results underline the importance of the PuBr3-type arrangement. The range of existence of this structure type is considerably increased under pressure. X-ray high temperature investigations at ambient pressure on the quenched high pressure phases show a marked correlation between the transformation pressures, which rise with smaller cations, and the temperatures at which the high pressure phases are reconverted to the thermodynamically stable ones.
    Notes: Seltenerd-Trichloride, -Tribromide und -Triiodide wurden in einer belt-Apparatur im Druckbereich bis 50 Kb untersucht. Wesentliches Ergebnis dieser Untersuchungen ist die Erweiterung des Existenzfeldes des PuBr3-Typs bei den genannten Verbindungsklassen in Richtung kleinerer Kationen. Röntgenographische Untersuchungen zum thermischen Verhalten der Hochdruckphasen zeigen einen Zusammenhang zwischen Umwandlungsdrücken und den zur Rückumwandlung in die Normaldruckphase nötigen Aktivierungstemperaturen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835020724
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Mischkristallbildung im System SrI2—BaI2 bei Normaldruck und bei 2,0 GPaProfessor Walter Rüdorff zum 75. Geburtstage am 3. Oktober 1984 gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 516 (1984), S. 13-18 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations of the Solid Solution in the System SrI2—BaI2 at Ambient Pressures and at 2.0 GPaThe P, T, x-diagram of the system SrI2—BaI2 has been investigated at ambient pressures and at 2.0 GPa. The amount of solid solution in the four structure types occuring in this system (SrI2- or PbCl2—ZrAs2-type with SrI2 and PbCl2- or anti-Fe2P-type with BaI2) differs considerably. Structural geometries belonging to the same PbCl2 structure family show marked differences in their toleration to cation substitution. Solid solution is especially pronounced in the BaI2-rich phases which incorporate up to 60 mol-% Sr2+ in the high pressure phase of BaI2.
    Notes: Isobare Schnitte bei Normaldruck und bei 2,0 GPa im P, T, x-Diagramm des Systems SrI2—BaI2 zeigen Mischkristallbildung unterschiedlichen Ausmaßes in den vier auftretenden Strukturtypen (SrI2- bzw. PbCl2—ZrAs2-Typ bei SrI2 und PbCl2- bzw. anti-Fe2P-Typ bei BaI2 bei 0,0001 bzw. 2,0 GPa). Die zur Strukturfamilie des PbCl2-Typs gehörigen Geometrien unterscheiden sich deutlich in der Toleranz gegenüber dem Einbau von Fremdkationen. Die Mischkristallbildung ist jeweils auf der BaI2-reichen Seite besonders ausgeprägt. In die Hochdruckphase des BaI2 lassen sich bis zu 60 Mol-% Sr2+ substituierend für Ba2+ einbauen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845160903
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  • 10
    Electronic Resource
    Electronic Resource
    Die Verfeinerung der Kristallstrukturen von CaHCl, SrHCl, BaHCl, BaHBr und BaHI (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 185-190 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Refinement of Crystal Structures of CaHCl, SrHCl, BaHCl, BaHBr, and BaHIThe structures of CaHCl, SrHCl, BaHCl, BaHBr and BaHI have been refined using single crystal data. The comparison of the parameters with the corresponding data of isotypic fluorohalide compounds gives a valuable insight into the bonding interactions in this structure type.
    Notes: Zur Erweiterung der Kenntnisse über Verbindungen, die im PbFCl-Typ kristallisieren, wurden die Strukturen von CaHCl, SrHCl, BaHCl, BaHBr und BaHI mit Einkristalldaten verfeinert. Der Vergleich der Parameter mit den entsprechenden Daten der isotypen Fluoridverbindungen läßt Schlüsse auf die Art der Bindungswechselwirkungen innerhalb der Struktur zu.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835020725
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