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  • Inorganic Chemistry  (33)
  • SOLAR PHYSICS
  • SPACECRAFT DESIGN, TESTING AND PERFORMANCE
  • 1975-1979  (83)
  • 1979  (83)
  • 1
    Electronic Resource
    Electronic Resource
    Vanadium oxide monolayer catalysts. I. Preparation, characterization, and thermal stability (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 449 (1979), S. 25-40 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vanadiumoxid Monoschichtkatalysatoren. I. Darstellung, Charakterisierung und thermische StabilitätDurch Chemisorption von Vanadat(V)-Anionen aus wäßrigen Lösungen, bzw. Chemisorption von gasförmigem V2O3(OH)4 wurden Vanadinoxidkatalysatoren des Monoschichttyps dargestellt. Mit Al2O3, Cr2O3, TiO2, CeO2, und ZrO2 als Trägeroxiden, können Katalysatoren mit einer ungefähr vollständigen monomolekularen Schicht von Vanadin(V)-Oxid auf den Trägeroxiden dargestellt werden, falls die Temperatur nicht zu hoch ist. Zweiwertige Metalloxide wie z. B. CdO und ZnO können schon bei niedriger Temperatur dreidimensionale Oberflächenvanadate bilden.Die thermische Stabilität eines Monoschichtkatalysators ist verbunden mit dem Parameter z/a: dem Quotient der Ladung des Trägerkations und der Summe der Ionenradien von Trägerkation und Oxidanion. Monoschichten werden thermisch nur stabil sein, falls z/a nicht zu groß (aggregierter Katalysator) und nicht zu klein (Bildung einer ternären Verbindung) ist.
    Notes: Vanadium oxide catalysts of the monolayer type have been prepared by means of chemisorption of vanadate(V)-anions from aqueous solutions and by chemisorption of gaseous V2O3(OH)4. Using Al2O3, Cr2O3, TiO2, CeO2 and ZrO2, catalysts with an approximately complete monomolecular layer of vanadium(V) oxide on the carrier oxides can be prepared, if temperature is not too high. Divalent metal oxides like CdO and ZnO may already form threedimensional surface vanadates at moderate temperature.The thermal stability of a monolayer catalyst is related to the parameter z/a, i. e. the ratio of the carrier cation charge to the sum of ionic radii of carrier cation and oxide anion. Thus, monolayer catalysts will be thermally stable only under the condition that z/a is not too high (aggregated catalyst) nor too small (ternary compound formation).
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794490102
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and characterization of a novel mercury(II) telluride chloride Hg5TeCl8 (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 457 (1979), S. 238-240 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Eigenschaften von Hg5TeCl8In schwefelsaurer Lösung reagiert HgTe mit überschüssigen Quecksilber(II)-Ionen unter Bildung löslicher kationischer mehrkerniger Komplexe. Die Verbindungen Hg5TeCl8 und Hg4Te(SO4)3 werden dargestellt und beschrieben.
    Notes: Telluride ion forms polynuclear soluble cationic complexes with excess Hg(II) in sulphuric acid media. Compounds Hg5TeCl8 and Hg4Te(SO4)3 were prepared and characterised.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794570131
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Reaktionsweisen von Na[Mn2(CO)9CN]Professor Walter Rüdorff zum 70. Geburtstage am 3. Oktober 1979 gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 456 (1979), S. 16-28 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: About the Reactivity of Na [Mn2(CO)9CN]The reactions of Na[Mn2(CO)9CN] with Et3OBF4, Me3SiCl, Me3GeCl, Me3SnCl, PPh2Cl, or MeCOCl lead to the dinuclear monoisonitrile complexes Mn2(CO)9CNR (R = Et, SiMe3, GeMe3, SnMe3, PPh2, COMe) which are characterized by their mass, vibrational, and n.m.r. spectra. However the solvates Na[Mn2(CO)9CN] · CH3COCH2Cl and Na[Mn2(CO)9CN] · NCCH2Cl are formed with CH3COCH2Cl and NCCH2Cl. Similar adducts are obtained with the Lewis bases CH3COCH3, NCCH3, and O(C2H5)2.
    Notes: Bei den Reaktionen von Na[Mn2(CO)9CN] mit Et3OBF4, Me3SiCl, Me3GeCl, Me3SnCl, PPh2Cl bzw. MeCOCl, werden die zweikernigen Monoisonitril-Komplexe Mn2(CO)9CNR (R = Et, SiMe3, GeMe3, SnMe3, PPh2, COMe) gebildet, die anhand ihrer Massen-, Schwingungs- und NMR-Spektren charakterisiert werden. Dagegen führen die entsprechenden Umsetzungen mit CH3COCH2Cl bzw. NCCH2Cl zu den Solvaten Na[Mn2(CO)9CN] · CH3COCH2Cl und Na[Mn2(CO)9CN] · NCCH2Cl. Eine ähnliche Adduktbildung erfolgt auch mit den Lewisbasen CH3COCH3, NCCH3 und O(C2H5)2.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794560102
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  • 4
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    Long-term solar activity predictions (1979)
    In:  CASI
    Details
    Publication Date: 2006-01-16
    Description: The need for long term solar activity predictions is addressed. The spatial organization of solar activity is described including applications for predictions, and ancient evidence for solar variability. Methods of predicting sunspot numbers are discussed. The inherent accuracy of the methods varies considerably, but a typical error bar 20%. The accuracy of sunspot cycle predictions is considered along with long term predictions of great solar events.
    Keywords: SOLAR PHYSICS
    Type: NASA. Marshall Space Flight Center Solar-Terrest. Predictions Proc., Vol. 2; p 246-257
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Hydrogen over helium enhancement in successive solar flare particle events from the same active region (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An analysis of all of the identified solar-flare-associated energetic particle events in the 1972-1975 period observed with instruments aboard the IMP 7 and IMP 8 satellites has revealed at least eight occasions when more than one particle-producing flare occurred within the same McMath active plage region during its transit of the visible solar disk. A strong tendency for second flares to produce hydrogen over helium (p/alpha) enhanced energetic particle fluxes when compared with the first flare in the 1.8-10.0 MeV per nucleon range emerged in these multiflare regions. The p/alpha enhancement is apparently transient, and for flares separated by at least about 100 hours the p/alpha ratio tends toward its preflare value. It is suggested that the substrate plasma in an active region may be enriched prior to a flare in elements heavier than hydrogen and the composition may not be significantly altered during subsequent acceleration, escape, and propagation. Thus, the preflare history of the active region must be added to the list of factors influencing observed solar-particle-event composition.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; vol. 228
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
    Electronic Resource
    Electronic Resource
    Über N-Silyl- und N-Germylpyridinyl-Radikale sowie ihre Stabilisierungsreaktionen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 936-949 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: N-Silyl and N-Germylpyridinyl Radicals, and Their Stabilization ReactionsPyridines, functionally substituted in 2-, 3-, or 4-position, give N-silylpyridinyls (3, 7, 11, 16, 19, 23) upon reaction with (Me3Si)2Hg, and further on mostly N,ω-bis(silyl) derivatives (5), tetrahydro-4,4′-or -2,2′-bipyridines (9, 17, 20, 21, 24, 25), depending on mesomeric and steric conditions. 2- and 3-acylpyridines yield O-silylated hydropyridoins (27, 30), 2-cyanopyridine forms a persistent pyridinyl (29). N-Germylpyridinyls (32-34) are generated for the first time. With (Me3Ge)2Hg, they are formed, however, only in the case of substituted pyridines of low electron density or strong mesomeric stabilization of the radicals. Several N ω-bis(germyl)-dihydropyridines (36, 37) rearrange, in part even at -30°C, with a surprising N, C-migration of a germyl residue, restoring the aromatic system, giving 35, 39. ESR data are given for most of the generated radicals.
    Notes: In 2-, 3- oder 4-Stellung funktionell substituierte Pyridine geben mit (Me3Si)2Hg N-Silylpyridinyle (3, 7, 11, 16, 19, 23), die je nach Mesomeriestabilisierung und sterischer Hinderung meistens zu N,ω-Bis(silyl)-Derivaten (5) oder zu Tetrahydro-4,4′- bzw. -2,2′-bipyridinen (9, 17, 20, 21, 24, 25) weiterreagieren. 2- und 3-Acylpyridine ergeben O-silylierte Hydropyridoine (27, 30), 2-Cyanpyridin ein kinetisch stabiles Pyridinyl (29). N-Germylpyridinyle (32-34) werden erstmals erhalten. Sie entstehen mit (Me3Ge)2Hg nur im Falle elektronenarmer substituierter Pyridine bzw. starker Mesomeriestabilisierung der Radikale. Bei N,ω-Bis(germyl)dihydropyridinen (36, 37) wurde, z. T. schon bei -30°C, eine überraschende N,C-Wanderung eines Germylrestes unter Rückbildung des aromatischen Systems zu 35, 39 gefunden. Für die meisten der erhaltenen Radikale werden die ESR-Daten angegeben.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120317
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  • 7
    Electronic Resource
    Electronic Resource
    Der Mechanismus der photolytischen Umsetzung von Pyridin mit Bis(trimethylsilyl)quecksilber, ein Beitrag zur metallorganischen Photochemie (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 950-956 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Mechanism of the Photolytic Reaction of Pyridine with Bis(trimethylsilyl)mercury, a Contribution to the Photochemistry with Metal AlkylsThe photolytic generation of N-(trimethylsilyl)pyridinyls 2 or. resp., their 4,4′-dimers from pyridine or its alkyl derivatives and bis(trimethylsilyl)mercury (1) involves surprisingly no free silyl radicals, but passes a long-lived, photoexcited, polar state 1a of the molecule 1. The latter is described more closely. It is complexed stepwise by two molecules of pyridine, and only in the last step free radicals are formed. The possibly more general importance of these findings for photolytic reactions with metal alkyls is pointed out.
    Notes: Die photolytische Bildung von W-(Trimethylsilyl)pyridinylen 2 bzw. ihren 4.4′-Dimeren. aus Pyridin bzw. seinen Alkylverbindungen und Bis(trimethylsilyl)quecksilber (1) verläuft überraschenderweise nicht über freie Silyl-Radikale, sondern über einen längerlebigen, photoangeregten, polaren Zustand la des Moleküls 1, über den nähere Aussagen gemacht werden. Er wird schrittweise durch zwei Moleküle Pyridin komplexiert, worauf erst im letzten Schritt freie Radikale entstehen. Auf die mögliche Bedeutung der Befunde für andere photolytische Reaktionen mit Metallalkylen wird hingewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120318
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  • 8
    Electronic Resource
    Electronic Resource
    Elektrophile aromatische Substitutionsreaktionen mit protonierten 1,3-Diazinen, II. Darstellung und Eigenschaften 4-arylsubstituierter 3,4-Dihydrochinazolin-Derivate (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1348-1358 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electrophilic Aromatic Substitution Reactions with Protonated 1,3-Diazines, II. Preparation and Properties of 4-Aryl-substituted 3,4-Dihydroquinazoline DerivativesIn the presence of trifluoroacetic acid, quinazoline and 2-methylquinazoline react with a great variety of aromatic compounds to form 4-aryl-substituted 3,4-dihydroquinazolinium salts, e. g. 2, 3. From those, the dihydro bases 4 can be obtained which are readily oxidized to 4-aryl-substituted quinazolines 5, 6. Highly reactive compounds like indole are treated in formic acid or acetic acid, for better results. Also, some CH-acidic compounds react with quinazoline in trifluoroacetic acid.
    Notes: Bei Gegenwart von Trifluoressigsäure (TFE) reagieren Chinazolin und 2-Methylchinazolin mit einem weiten Spektrum aromatischer Verbindungen zu stabilen 4-arylsubstituierten 3,4-Dihydro-chinazoliniumsalzen, z. B. 2, 3, aus denen sich die zugrunde liegende Dihydrobase 4 erhalten läßt, die ihrerseits zu 4-arylsubstituierten Chinazolinen 5, 6 oxidiert werden kann. Im Fall besonders reaktiver Aromaten (z. B. Indol) läßt sich TFE vorteilhaft durch Eisessig oder Ameisensäure ersetzen. Auch eine Reihe CH-acider Verbindungen reagiert in TFE mit Chinazolin.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120428
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  • 9
    Electronic Resource
    Electronic Resource
    Elektrophile aromatische Substitutionsreaktionen mit protonierten 1,3-Diazinen, I. Darstellung und Eigenschaften 4-arylsubstituierter 3,4-Dihydropyrimidin-Derivate (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 1-15 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Electrophilic Aromatic Substitution Reactions with Protonated 1,3-Diazines, I. Preparation and Properties of 4-Aryl-substituted 3,4-Dihydropyrimidine DerivativesIn the presence of trifluoroacetic acid, pyrimidine and 5-methylpyrimidine react with active aromatic compounds to form stable 4-aryl-substituted 3,4-dihydropyrimidinium salts, e.g. 1, 2, 6. From these, the dihydro bases 7 or 8 can be obtained which are readily oxidized to 4-aryl-substituted pyrimidines 9. 2- and/or 4-substituted pyrimidines as well as 2-amino- and 2-mercaptopyrimidines react with phenols to form benz[g][1,3,5]oxadiazocines 3 and 10. The mechanism of this novel reaction is apparently best described as an aromatic electrophilic substitution by the protonated pyrimidine derivative. The observed reactivity of different diazines is in accordance with frontier orbital arguments, using HMO-coefficients.
    Notes: Bei Gegenwart von Trifluoressigsäure reagieren Pyrimidin und 5-Methylpyrimidin mit aktiven aromatischen Verbindungen zu stabilen 4-arylsubstituierten 3,4-Dihydropyrimidinium-Salzen, z. B. 1, 2, 6, aus denen sich die zugrunde liegende Dihydrobase 7 bzw. 8 erhalten läßt, die ihrerseits leicht zu 4-arylsubstituierten Pyrimidinen 9 oxidiert werden kann. 2- und/oder 4-substituierte Pyrimidine sowie 2-Amino- und 2-Mercaptopyrimidine bilden mit Phenolen Benz[g][1,3,5]oxadiazocine der (Konstitution 3a - f und 10. Als Reaktionsmechanismus wird eine elektrophile Substitutionsreaktion durch das protonierte Pyrimidinderivat vorgeschlagen. Die beobachtete Reaktivität der verschiedenen Diazine steht im Einklang mit dem Grenzorbital-Modell auf der Basis der HMO-Koeffizienten.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120102
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  • 10
    Electronic Resource
    Electronic Resource
    Copper Hydrogen Orthoarsenate Monohydrate, CuHAsO4 · H2O isothermal decomposition and X-Ray diffractometric studies (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 448 (1979), S. 156-160 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Kupferhydrogenorthoarsenat-Monohydrat, CuHAsO4 · H2O, isotherme Zersetzung und Untersuchung mit Röntgen-PulveraufnahmenBei der thermischen Zersetzung (isotherme Methode) von CuHAsO4 · H2O entstehen zuerst CuHAsO4, dann Cu2As2O7. Die Gitterparameter aller drei Verbindungen wurden aus Röntgen-Pulveraufnahmen ermittelt.
    Notes: Thermal decomposition of copper hydrogen orthoarsenate monohydrate has been studied by isothermal technique and X-ray diffraction method. The decomposition to the final diarsenate proceeds through the formation of an intermediate anhydrous salt. The lattice parameters for the starting monohydrate and the two dehydrated-decomposed compounds have been evaluated.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794480118
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