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  • FLUID MECHANICS AND HEAT TRANSFER  (338)
  • Inorganic Chemistry
  • 1985-1989  (485)
  • 1
    Electronic Resource
    Electronic Resource
    Caracterisation Structurale de l′Oxyfluorotungstate de Cuivre CuWO3F2 (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 539 (1986), S. 165-174 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of CuWO3F2The crystal structure of the copper(II) oxyfluoridetungstate CuWO3F2 has been determined from single crystal X-ray data. The symmetry is monoclinic (space group P21/m) with lattice parameters a = 5.223(1) Å, b = 9.599(4) Å, c = 3.670(1) Å, β = 106.26(1)° (Z = 2). The structure has been fixed by the heavy atom method and refined by least square calculations down to a R factor of 0.019. Oxygen-fluorine ordering has been determined on the network built up by corner sharing octahedra constituting infinite chains, by several methods: Raman spectroscopy, electrostatic energy calculations, and bond valence determinations. The structural formulation of the octahedra is (WO2F2O2/2)2-.
    Notes: La structure cristalline de l′oxyfluorotungstate de cuivre CuWO3F2 a été déterminée par diffraction × sur monocristal (R = 0,019). CuWO3F2 cristallise dans le système monoclinique avec le groupe spatial P21/m et les paramètres a = 5,223(1) Å, b = 9,599(4) Å, c = 3,670(1) Å, β = 106,26(1)°, Z = 2. Le réseau est constitué d′octaèdres WX6 (X = O, F) liés par des sommets en position trans formant une chaîne infinie. Les atomes de cuivre divalent sont insérés entre les chaînes en coordinence octaédrique déformée (4+2). L′ordre oxygène-fluor au sein de CuWO3F2 a été établi à l′aide de la spectroscopie Raman, de calculs d′énergie électrostatique et de la méthode des bilans des valences de liaisons. La chaîne octaédrique peut se formuler (WO2F2O2/2)2-.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865390815
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchungen an oxidischen Katalysatoren. XLVI. Synthetische Boroalumosilicate mit Pentasilstruktur (SABO): Strukturelle, oberflächenchemische und katalytische EigenschaftenProfessor Ch. M. Minačew zum 80. Geburtstage am 24. Dezember 1988 gewidmet (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 39-48 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Oxide Catalysts. XLVI. Synthetic Boroaluminosilicates with Pentasil Structure (SABO): Structural, Surface Chemical, and Catalytical PropertiesA remarkable modification of ZSM-5 type zeolites is possible by isomorphous substitution of silicon and/or aluminium by boron. In the H-forms of these SABO zeolites the boron atoms mainly exist in a trigonal lattice oxygen environment and hence they are not envolved in the formation of Broensted acid sites. Consequences of incorporated boron for catalytic reactions result from a decrease in the strength of existing Broensted sites as well as from a partial lattice contraction.
    Notes: Eine bemerkenswerte Modifizierung von Zeolithen des ZSM-5-Typs gelingt auf dem Wege der isomorphen Substitution von Silicium und/oder Aluminium durch Bor. In den H-Formen derartiger SABO-Zeolithe liegt Bor bevorzugt in trigonaler Gittersauerstoffkoordination vor und ist 30mit an der Bildung von Brönsted-Säurezentren nicht beteiligt. Konsequenzen eines isomorphen Boreinbaus für katalytische Reaktionen ergeben sich im wesentlichen aus einer Verringerung der Stärke vorhandener Brönsted-Zentren sowie aus einer mehr oder weniger starken Gitterkontraktion.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885660106
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  • 3
    Electronic Resource
    Electronic Resource
    Komplexkatalyse. XXXIII. Zum Einfluß von Anionen (B(O2C6H4)2-, CF3CO2-, Br-, I-) auf die Einschubreaktion von Hexa-1,5-dien in die Allyl-nickel(II)-Bindung. Darstellung und Charakterisierung des η2,η1,η2-Nona- und Deka-1,8-dien-5-yl-nickel(II)-bis(brenzcatechinato)boratsProfessor Kurt Issleib zum 70. Geburtstage am 19. November 1989 gewidmet (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 578 (1989), S. 89-98 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complex Catalysis. XXXIII. To the Influence of Anions (B(O2C6H4)2-, CF3CO2-, Br-, I-) on the Insertion Reaction of Hexa-1,5-diene into the Allyl Nickel(II) Bond. Preparation and Characterization of η2,η1,η2-Nona- and Deka-1,8-diene-5-yl-nickel(II) bis(brenzcatechinato)borate[η3-C3H5NiB(O2C6H4)2] and [η3-C4H7NiB(O2C6H4)2] react with hexa-1,5-diene in CH2Cl2 by an insertion reaction into the allyl nickel bond to give the corresponding η2,η1,η2-nona- and deca-1,8-diene-5-yl-nickel(II) complex, respectively. Both chelate organyl nickel(II) complexes are monomeric; they are examples demonstrating the special suitability of the bis(brenzcatechinato)-borate anion for the preparation of organometallic reaction products in the allyl nickel chemistry. The known dimeric allyl nickel(II) compounds [C3H5NiX]2 (X- = CF3CO2-, Br-, I-) do not show this reaction.
    Notes: [η3-C3H5NiB(O2C6H4)2] und [η3-C4H7NiB(O2C6H4)2] reagieren mit Hexa-1,5-dien in CH2Cl2 unter Einschubreaktion in die Allylnickel-Bindung zu dem entsprechenden η2,η1,η2-Nona-bzw. Deka-1,8-dien-5-yl-nickel(II)-Komplex. Beide Chelatorganylnickel(II)-Komplexe sind monomer und ein Beispiel für die besondere Eignung des Bis(brenzcatechinato)borat-Anions zur Darstellung von metallorganischen Reaktionsprodukten in der Allylnickelchemie. Die bekannten dimeren Allylnickel(II)-Verbindungen [C3H5NiX]2 (X- = CF3CO2-, Br-, I-) zeigen diese Reaktion nicht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895780111
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  • 4
    Electronic Resource
    Electronic Resource
    Komplexkatalyse. XXXII. Synthese und Charakterisierung von η3-Allyl-, η3-Crotyl-und η1,η2-Cyclooct-4(Z)-en-1-yl-nickel(II)-bis(brenzcate-chinato)-borat und ihre Eignung als Katalysatoren für die stereospezifische Butadienpolymerisation (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 577 (1989), S. 245-254 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complex Catalysis. XXXII. Synthesis and Characterization of η3-Allyl-, η3-Crotyl-, and η1,η2-Cyclooct-4(Z)-en-1-yl-nickel(II)-bis(brenzcatechinato)borate and their Suitability as Catalysts for the Stereospecific Butadiene PolymerizationBy reaction of [(η3-C3H5)2Ni], [(η3-C4H7)2Ni], and [Ni(cycloocta-1,5-diene)2] with one equivalent bis(brenzcatechinato)boric acid HB(O2C6H4)2 in ether the complexes given in the title could be synthesized in good yields. The allyl complex [η3-C3H5NiB(O2C6H4)2] reacts with cycloocta-1,5-diene (COD) to give a cationic complex [η3-C3H5Ni(COD)]B(O2C6H4)2 and catalyses the 1,4-trans-polymerization of butadiene with an activity of ca. 150 ml C4H6/mol Ni · h and a selectivity of 78% under standard conditions at room temperature.
    Notes: Durch Reaktion von [(η3-C3H5)2Ni], [(η3-C4H7)2Ni] und [Ni(cycloocta-1,5-dien)2] mit jeweils einem Äquivalent Bis(brenzcatechinato)borsäure HB(O2C6H4)2 in Ether sind die im Titel genannten Komplexe in guter Ausbeute zugänglich. Der Allylkomplex [η3-C3H5NiB(O2C6H4)2] bildet mit Cycloocta-1,5-dien (COD) einen kationischen Komplex [η3-C3H5Ni(COD)]B(O2C6H4)2 und katalysiert unter Standardbedingungen bei Raumtemperatur mit einer Aktivität von etwa 150 mol C4H6/mol · Ni · h und einer Selektivität von etwa 78% die 1,4-trans-Polymerisation des Butadiens.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895770128
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  • 5
    Electronic Resource
    Electronic Resource
    Etude par RMN de 19F de la Solution Solide K1-xBixF1+2x et de la Phase Ordonnée KBi3F10 (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 537 (1986), S. 40-52 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Study on the 19F NMR of the Solid Solution K1-xBixF1+2x and the ordered KBi3F10 phase KBi3F10The solid solution K1-xBixF1+2x (0.50 ≤ x ≤ 0.70) and the ordered KBi3F10 phase have been investigated by 19F NMR. The evolution of the absorption spectra shows that the number of mobile F- ions increases with temperature. The higher the fluorine concentration, the higher the temperature required to observe for all F- ions a jump frequency exceeding dipolar frequency; it increases from 250 K for K0.49Bi0.51F2.02 to 425 K for KBi3F10.The analysis of the results vs x confirms that the lower limit of the solid solution corresponds to 0.49 〈 x 〈 0.51. The results are consistent with a progressive extension of the local clustering of defects (F8 cubes and F12 cubooctahedra) up to formation of the long range ordered phase KBi3F10.Comparison with electrical conductivity measurements shows that the motions detected by NMR are diffusive ones.
    Notes: Résumé. La solution solide K1-xBixF1+2x (0,50 ≤ x ≤ 0,70) et la phase ordonnée KBi3F10 ont été étudiées par RMN de 19F. L'évolution des spectres d'absorption laisse apparaître une augmentation du nombre de fluors mobiles avec la température. La température à partir de laquelle tous les fluors ont une fréquence de sauts supérieure à la fréquence dipolaire augmente régulièrement de 250 à 425 K lorsque l'on passe de la composition K0,49Bi0,51F2,02 à KBi3F10.L'analyse des résultats obtenus confirme que la limite inférieure de la solution solide correspond à 0,49 〈 x 〈 0,51 et que les défauts s'ordonnent localement en cubelets F8 et cubooctaèdres F12, qui s'étendent progressivement au sein de la solution solide jusqu'à la formation de la phase ordonnée à grande distance KBi3F10.La comparaison avec les mesures de conductivité montre que les mouvements des ions F- vus par RMN sont des mouvements diffusifs.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865370605
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  • 6
    Electronic Resource
    Electronic Resource
    Elektrochemische Darstellung von Cyclopolyphosphanen - Elektrochemische Untersuchung von Phenyldichlorphosphan, o-, m-, p-Bromphenyl-dichlorphosphan sowie tert.-Butyldichlorphosphan (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 542 (1986), 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: Synthesis of Different Cyclopolyphosphanes by Cathodic Reduction, Electrochemical Investigation of Phenyldichlorophosphane, o-, m-, p-Bromophenyldichlorophosphane and tert.-ButyldichlorophosphaneThe electrochemical properties of selected dichlorophosphanes R-PCl2 (R = C6H5, o-BrC6H4, m-BrC6H4, p-BrC6H4, t-Bu) have been investigated by the Differential-Pulse-Polarography (DPP) and by cyclic voltammetry. On the basis of the obtained results an electrolysis (cathodic reduction) has been carried out with these substances in a 1,2-dichlorethane/0.1 M tetrabutyl-ammonium tetrafluoroborate solution with a mercury pool. The following cyclopolyphosphanes have been prepared, isolated, and characterized: (C6H5P)5,(4); (o-BrC6H4P)4; (m-BrC6H4P)5,(4,6); (p-BrC6H4P)5,(4); (t-BuP)4.
    Notes: Mit Hilfe von Differential-Puls-Polarographie (DPP) und Cyclovoltammetrie wurde das elektrochemische Verhalten ausgewählter Dichlorphosphan-Verbindungen R-PCl2 (R = C6H5, o-BrC6H4, m-BrC6H4, p-BrC6H4, t-Bu) untersucht. Auf der Grundlage der erhaltenen Werte wurden diese Substanzen in einer 1,2-Dichlorethan/0,1 M Tetrabutylammonium-tetrafluoroborat-Lösung kathodisch an einem Quecksilbersee elektrolysiert. Folgende Cyclopolyphosphane wurden dabei hergestellt, isoliert und charakterisiert: (C6H5P)5,(4); (o-BrC6H4P)4; (m-BrC6H4P)5,(4,6); (p-BrC6H4P)5,(4); (t-BuP)4.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865421122
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  • 7
    Electronic Resource
    Electronic Resource
    A Photoelectrochemical Study of α-Fe2O3 Single Crystals (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 528 (1985), S. 202-208 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photoelektrochemische Untersuchungen von α-Fe2O3-Einkristallenα-Fe2O3 Einkristalle mit relativ hoher Reinheit und stöchiometrischer Zusammensetzung wurden mit Hilfe von photoelektrochemischen Messungen untersucht.Zwei indirekte Elektronenübergänge wurden bei 2,04 und 2,32 eV beobachtet. Sie sind auf Eisen-Eisen-Ladungsübertragungen zurückzuführen.Diese und frühere Ergebnisse zeigen, daß der Unterschied zwischen dem Flachbandpotential und dem Einsatzpotential des Photostromes sich stark mit der Donatorkonzentration erhöht.
    Notes: α-Fe2O3 single crystals of relatively high purity and stoichiometry have been studied using photoelectrochemical techniques. Two indirect electronic transitions are observed at 2.04 and 2.32 eV and are ascribed to iron-iron charge transfers.From the present work and literature data it is shown that the difference between the flat band potential and the photocurrent onset potential increases strongly with the donor concentration.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855280924
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  • 8
    Electronic Resource
    Electronic Resource
    Formation and Crystallization of FeIII Hydroxides. Effects of precipitation temperature and the nature of starting FeIII salt on the properties of FeIII hydroxides prepared in weakly acidic medium (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 526 (1985), S. 191-202 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Bildung und Kristallisation von FeIII-Hydroxiden. 2. Einfluß der Fällungstemperatur und Natur des Ausgangs-FeIII-Salzes auf die Eigenschaften des in schwach saurem Medium dargestellten FeIII-HydroxidsAmorphe, bei pH = 6 dargestellte FeIII-Hydroxide unterscheiden sich von entsprechenden Niederschlägen aus alkalischen Medien durch einen zunehmenden Gehalt an Anionen in ihren Strukturen und kristallisieren weniger leicht sowohl bei trockner, thermischer Behandlung wie unter hydrothermalen Bedingungen. Die DTA-Kurven, die von frisch präparierten Gelen sowie von in Mutterlauge gealterten Produkten erhalten wurden und der Einfluß der vorhandenen Anionen auf den Verlauf der thermischen Zersetzung werden diskutiert.
    Notes: Amorphous FeIII hydroxides prepared at pH = 6 differ from analogous precipitates obtained in alkaline media in that they have an increased content of anions bound in their structures, and crystallize less readily both in dry thermal treatment and under hydrothermal conditions. The shapes of DTA curves obtained for freshly prepared gels and for products of ageing in mother liquor are discussed, and the effect of the anions present on the course of thermal decomposition is assessed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855260724
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  • 9
    Electronic Resource
    Electronic Resource
    Infrarotspektroskopische Untersuchung der Wechselwirkung Ni-haltiger Y-Zeolithe mit Kohlenmonoxid (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 539 (1986), S. 211-218 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: I.R.-Spectroscopic Investigation of the Interaction between Ni-containing Y-Zeolites and Carbon MonoxideBy the interaction of CO with reduced NiNaY or NiHY samples adsorbed CO on Ni2+ (2 215 cm-1) and on Ni+ (2 085 and 2 095 cm-1, respectively) and two species of adsorbed Ni(CO)4 are formed. Ni(CO)4 is produced in a slow, reversible reaction. Both species are in an equilibrium which is influenced by the acidity of the samples.
    Notes: Bei der Einwirkung von CO auf reduzierte NiNaY- und NiHY- Zeolithe beobachtet man adsorbiertes CO an Ni2+ (2 215 cm-1) und an Ni+ (2 085 bzw. 2 095 cm-1) sowie zwei Formen von adsorbiertem Ni(CO)4. Ni(CO)4 wird in einer langsamen, reversiblen Reaktion gebildet. Die beiden Formen stehen in einem durch die Acidität der Proben beeinflußten Gleichgewicht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865390822
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  • 10
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    On the reverse flow ceiling jet in pool fire-ventilation crossflow interactions in a simulated aircraft cabin interior (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The behavior of the reverse flow ceiling jet against the ventilation flow from 0.58 to 0.87 m/s was investigated in a 1/3 scale model of a wide body aircraft interior. For all tests, strong reverse-flow ceiling jets of hot gases were detected well upstream of the fire. Both thicknesses of the reverse-flow ceiling jet and the smoke layer increased with the fire-crossflow parameter. The thickness of the smoke layer where the smoke flows along the main flow below the reverse-flow ceiling jet was almost twice that of the reverse-flow ceiling jet. Detailed spatial and time-varying temperatures of the gas in the test section were measured, and velocity profiles were also measured using a temperature compensated hot film.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
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