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  • Inorganic Chemistry  (21)
  • Organic Chemistry  (5)
  • Surface physics, nanoscale physics, low-dimensional systems
  • 42.75
  • 1985-1989  (26)
Collection
Publisher
Year
  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ionic Structures of 4- and 5-coordinated Silicon. Novel Ionic Crystal Structures of 4- and 5-coordinated Silicon: [Me3Si(NMI)]+ Cl-, [Me2HSi(NMI)2]+ Cl-, [Me2Si(NMI)3]2+ 2 Cl-. NMIMe3SiCl forms with N-Methylimidazole (NMI) a crystalline 1:1-compound which is stable at room temperature. The X-ray single crystal investigation proves the ionic structure [Me3Si(NMI)]+Cl- 1 which is the result of the cleavage of the Si—Cl bond and the addition of an NMI-ring. The reaction of Me2HSiCl with NMI (in the molar ratio of 1:2), under cleavage of the Si—Cl bond and co-ordination of two NMI rings, yields the compound [Me2HSi(NMI)2]+Cl- 2. The analogous reaction of Me2SiCl2 with NMI (molar ratio 2:1) leads to a compound which consists of Me2SiCl2 and NMI in the molar ratio of 1:2. During the sublimation single crystals of the compound [Me2Si(NMI)3]2+ 2 Cl-. NMI 3 are formed.
    Notes: Me3SiCl bildet mit N-Methylimidazol (NMI) eine bei Raumtemperatur beständige, kristalline 1:1 Verbindung. Nach der Röntgenstrukturanalyse entsteht unter Spaltung der Si—Cl-Bindung und Anlagerung eines NMI-Rings eine Verbindung ionischer Struktur [Me3Si(NMI)]+Cl- 1. Die Reaktion von Me2HSiCl mit NMI (Molverhältnis 1:2) führt unter Spaltung der Si—Cl-Bindung und Koordination von zwei NMI-Ringen zur Verbindung [Me2HSi(NMI)2]+Cl- 2. Bei der analogen Umsetzung von Me2SiCl2 mit NMI (Molverhältnis 2:1) entsteht eine Verbindung, die Me2SiCl2 und NMI im Molverhältnis 1:2 enthält. Bei der Sublimation werden Einkristalle der Verbindung [Me2Si(NMI)3]2+ 2 Cl-· NMI 3 erhalten.
    Additional Material: 3 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 603-604 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New Chiral Auxiliary Groups: Formation of a Phenylaza Analogue of Camphanic Acid after Change of N/O-Regioselectivity of a Ring-Contraction ReactionBy treating α-bromo imide (-)-1 with sodium methylate an earlier observed mode of ring contraction is altered from O- to N-alkylation and the bicyclic lactam (+)-3b is formed.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 560 (1988), S. 153-157 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-Ray Structure Analysis of Single Crystals of Ternary Rare Earth Vanadium(III) Oxides LnVO3 (Ln = Gd, Dy, Er)X-ray structure investigations were performed on single crystals of LnVO3 (Ln = Gd, Dy, and Er), grown by flux electrolysis. The three compounds are isotypic, they crystallize in an orthorhombic distorted perovskite structure.
    Notes: An Einkristallen von LnVO3 (Ln = Gd, Dy und Er), die durch Schmelzflußelektrolyse gezüchtet wurden, erfolgten Röntgenstrukturuntersuchungen. Die drei Verbindungen sind isotyp, sie kristallisieren in einer orthorhombisch verzerrten Perowskitstruktur.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 573 (1989), S. 133-142 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Oxotellurates(VI) of the Alkali Metals. Existence and Constitution of Li6TeO6For the first time Li6TeO6 is prepared as transparent, colourless single crystals, and the structure has been determined [four-circle diffractometer data, Siemens AED2, MoKα, 371 out of 371 IO(hkl), R = RW = 0.7%, R3, a = 791.99(6) pm, c = 696.44(7) pm, Z = 3].The structure refinement shows that Li6TeO6 is a variant of the NaCl-Typ. Nevertheless there is a relationship with α-Li6UO6 [2]. The Madelung Part of Lattice Energy, MAPLE, and Effective Coordination Numbers, ECoN, the latter derived from Mean Effective Fictive Ionic Radii, MEFIR, are calculated and discussed.
    Notes: Erstmals wurden klar durchscheinende, farblose Einkristalle von Li6TeO6 dargestellt und strukturell untersucht. [Vierkreisdiffraktometerdaten, Siemens AED2, MoKα-Strahlung, 371 von 371 IO(hkl), R = RW = 0,7%, R3, a = 791,99(6) pm, c = 696,44(7) pm, Z = 3].Die Strukturbestimmung zeigt, daß Li6TeO6 eine Variante des NaCl-Typs ist. Dennoch besteht Verwandtschaft mit α-Li6UO6 [2]. Der Madelunganteil der Gitterenergie, MAPLE, sowie Effektive Koordinationszahlen, ECoN, diese über Mittlere Effektive Ionenradien, MEFIR, werden berechnet und diskutiert.
    Additional Material: 12 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fest-Flüssig-Phasengleichgewichte des Systems KCl—MgCl2—H2O bei erhöhten Temperaturen. III. Isothermen bei 160, 170 und 180°CExperimentelle Ergebnisse der Fest-Flüssig-Phasengleichgewichte im System KCl—MgCl2—H2O bei 160, 170 und 180°C werden vorgestellt. Neben den bekannten festen Phasen KCl, KCl · MgCl2 · 6 H2O und MgCl2 · 4 H2O wurden zwei weitere Doppelsalze mit der Zusammensetzung 1,5 KCl · MgCl2 · 2 H2O und KCl · MgCl2 · 2 H2O gefunden. Das letztere Doppelsalz und MgCl2 · 2 H2O bilden feste Lösungen. Die neuen Verbindungen wurden mit Hilfe der Röntgenpulverdiffraktometrie charakterisiert.
    Notes: Experimental results are reported for the solid-liquid phase equilibria of the ternary system KCl—MgCl2—H2O at 160, 170, and 180°C. Beyond the known solid phases KCl, KCl · MgCl2 · 6 H2O, and MgCl2 · 4 H2O two further double salts with the composition 1.5 KCl · MgCl2 · 2 H2O and KCl · MgCl2 · 2 H2O have been found. The latter double salt and MgCl2 · 2 H2O form solid solution. The new compounds were characterized by X-ray powder diffractometry.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 532 (1986), S. 90-98 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mixed Crystals from A4B3 Molecules (A = P, As; B = S, Se)The system P4S3—P4Se3—As4S3—As4Se3 was investigated by thermal and x-ray methods. Five regions of solid solubility with different crystal structures were found at room temperature. The range of existence can be influenced by the temperature of annealing. All these phases transform into a plastic-crystalline modification with complete solid solubility at higher temperature. A decomposition reaction of the A4B3 molecules was observed in the P4Se3/As4Se3/As4S3 part of the system. The molecules decompose into A4B4 molecules and an amorphous phase.The existence of all molecules of the type PnAs4-nSmSe3-m (n = 0-4, m = 0-3) and also As4SmSe4-m (m = 1-3) was verified by mass spectrometric measurements. The thermochemical data of the mixed crystals are determined by the type of the constituent A4B3 molecules. The temperature and the entropy of the α-β transition are lower for mixed crystals, formed by substituted molecules, than for those of the same structure, consisting of pure A4B3 molecules.
    Notes: Das quaternäre System P4S3—P4Se3—As4S3—As4Se3 wurde röntgenographisch und thermoanalytisch untersucht. Von den jeweiligen Randkomponenten P4S3, P4Se3 und As4S3 gehen Mischkristalle aus, die sich mit unterschiedlicher Ausdehnung über das ganze System erstrecken. Bei Temperaturerhöhung gehen sie in eine plastisch-kristalline Phase über, die völlige Mischbarkeit aufweist. Im Teildreieck P4Se3/As4Se3/As4S3 findet bei genügend langen Reaktionszeiten eine Zersetzungsreaktion von A4B3-Molekülen in A4B4-Moleküle und eine amorphe Phase statt, so daß der Gehaltsschnitt verlassen wird.Durch massenspektroskopische Untersuchungen wurde erstmals die Existenz aller substituierten Moleküle der Form PnAs4-nSmSe3-m (n = 0-4, m = 0-3) sowie As4SmSe4-m (m = 1-3) nachgewiesen. Durch thermische und röntgenographische Messungen konnte ein Einfluß der Existenz substituierter Käfigmoleküle auf den Molekülkristall festgestellt werden. Besonders stark ist dieser Einfluß auf Temperatur und Entropie der α-β-Umwandlung. Beide sind, bei gleicher Struktur, für Kristalle die nur aus unsubstituierten A4B3-Molekülen bestehen, größer als für solche, die von substituierten Molekülen gebildet werden.
    Additional Material: 5 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 566 (1988), S. 49-54 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Neutron Diffraction Studies of SrBr2 · H2O and SrI2 · H2O, Symmetrically and Asymmetrically Bonded Water MoleculesSingle crystal neutron diffraction studies were performed on the isostructural (space group Pnma) SrBr2 · H2O and SrI2 · H2O. Lengths and structure of the hydrogen bonds are correlated with Raman and IR spectroscopic data. The bifurcated and trifurcated H-bonds present are altogether significantly stronger than linear ones with similar H…Br and H…I distances, respectively. In the case of SrI2 · H2O, the H-bonds of the two hydrogen atoms of the water molecules exhibit equal strength (symmetric water molecule) as shown by the respective OH vibrational energies despite the different H…I distances. The water molecule of SrBr2 · H2O is asymmetrically bonded (different strength of the H-bonds).
    Notes: An den isotypen Hydraten SrBr2 · H2O und SrI2 · H2O (Raumgruppe Pnma) wurden Einkristallneutronenbeugungsmessungen vorgenommen. Die Bindungslängen sowie die Anordnung der verzweigten Wasserstoffbrücken werden mit Raman- und IR-spektroskopischen Daten korreliert. Die zwei- bzw. dreifach verzweigten Wasserstoffbrücken sind insgesamt signifikant stärker als gleich lange lineare Brücken zu Br--und I--Ionen. Die von den beiden Wasserstoffatomen des SrI2 · H2O gebildeten H-Brücken sind, wie die entsprechenden OH-Schwingungsfrequenzen zeigen, trotz der unterschiedlichen H…I-Abstände gleich stark (H2O symmetrisch). Das Kristallwassermolekül des SrBr2 · H2O ist asymmetrisch gebunden (unterschiedlich starke H-Brücken).
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 305-308 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: HPLC Studies on the Distribution Behaviour of Selected I-Amino-3-aryl-guanidinium Nitrates
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  • 9
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Substituted aromatic isothiocyanates with malonyl chloride yield 7-chloro-3-substituted-3,4-dihydro-4,5-dioxo-2-thio-2H,5H-pyrano [3,4-e]-1,3-oxazine (1).Alkyl isothiocyanates with malonyl chloride yield a mixture of 7-chloro-3-alkyl-2-thio pyranooxazine (2) and the 2-oxo-analogue (3).The pyrano oxazine 1 react stepwise with morpholine undergoing replacement of the 7-chloro substituent yielding the 7-morpholino analogue (4), then the pyrone ring was opened producing 5-morpholino carbonyl-4-oxo-3-substituted phenyl-2-thio-1,3-oxazine-6-ylacetomorpholid (5). Finally the oxazine ring was opened yielding 2-substituted phenyl carbomyl-3-morpholino-N,N-glutaconoyldimorpholine (6).Ethanol react with compound 1 at any molar ration causing the opening of the pyrone ring and retain the oxazine ring.Mass spectra. 1H-n.m.r., u.v. and i.r. spectroscopic data provided information about the fine structures of the products.
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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: Reactions of (η2-Ethene)bis(triphenylphosphane)platinum(0) with Dimeric Hexafluorothioacetone. Preparation and Structure of Platina Cyclopentane and Cyclopropane DerivativesThe five-membered (CS)2Pt ring 1 was obtained by the reaction of 2, 2, 4, 4-tetrakis(trifluoromethyl)-1,3-dithietane and (η2-ethene)bis(triphenylphosphane)platinum(0) at low temperatures. 1 is converted at its melting point to the three-membered CSPt ring derivative 2, with elimination of one molecule of hexafluorothioacetone. 2 is also formed directly when the reaction is conducted at temperatures above +30°C. 2 was characterized by an X-ray Structural analysis.
    Notes: Der fünfgliedrige (CS)2Pt-Cyclus 1 kann aus 2, 2, 4, 4-Tetrakis(trifluormethyl)-1,3-dithietan und (η2-Ethen)bis(triphenylphosphan)-platin(0) bei tiefer Temperatur erhalten werden. 1 wandelt sich an seinem Schmelzpunkt unter Abspaltung eines Moleküls Hexafluorthioaceton in den um zwei Ringglieder reduzierten CSPt-Ring 2 um, der auch auf direktem Wege durch Umsetzen des Dithietans bei Temperaturen oberhalb von +30° zugänglich ist. 2 konnte erstmals durch eine Kristallstrukturbestimmung charakterisiert werden.
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