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  • Inorganic Chemistry  (2)
  • crystal structure  (2)
  • molecule  (2)
  • synthesis  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic estimation of dissociation pressure parameters for solid molecular substances
    Amsterdam : Elsevier
    Journal of Physics and Chemistry of Solids 53 (1992), S. 319-321 
    Details
    ISSN: 0022-3697
    Keywords: Pressure ; chalcogen ; dissociation ; halogen ; hydrogen ; molecule ; oxygen
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-3697(92)90062-I
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  • 2
    Electronic Resource
    Electronic Resource
    Anisotropy of Atomic Van der Waals Radii in the Gas-Phase and Condensed Molecules\sp{1} (2000)
    Springer
    Structural chemistry 11 (2000), S. 177-183 
    Details
    ISSN: 1572-9001
    Keywords: van der Waals radius ; molecule ; crystal ; anisotropy ; hydrogen bond
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The anisotropic components of van der Waals radii for 5b, 6b and 7b Group elements were determined from the structures of gaseous van der Waals complexes and of crystalline molecular solids. The transition from the gaseous to the solid state reduces the anisotropy of a van der Waals atomic shape. This anisotropy is largely responsible for the changes of intermolecular distances, which are often misinterpreted as an effect of hydrogen bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009222027852
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  • 3
    Electronic Resource
    Electronic Resource
    Polar bonds in π-complexes. Preparation and crystal structures of cyclopentadienylcarbonyl iron(II) and ruthenium(II) benzoates andp-fluorobenzoates (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 359-364 
    Details
    ISSN: 1573-9171
    Keywords: iron(II) and ruthenium(II) complexes ; synthesis ; carbonyl, cyclopentadienyl, benzoate ligands ; crystal structure ; X-ray diffraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Complexes of Fe(II) and Ru(II) of the general formula Cp(OC)2MOC(O)C6H4X-p, where M=Fe, X=H, F (1, 2) or M=Ru, X=H, F (3, 4) have been prepared by reactingp-XC6H4COOAg with [CpFe(CO)2]2 or CpRu(CO)2I. The crystal structures of complexes1–3 have been determined using X-ray diffraction. Compounds1 and3 are isomorphous. The COO group in1–3 is coordinated as a monodentate ligand. As the latter and the CO ligands are electronically non-equivalent, the coordination of the Cp ligand to the metal is slightly asymmetric.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697097
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of 2,5-bis(fluorodinitromethyl)-1,3,4-oxadiazole (1994)
    Springer
    Russian chemical bulletin 43 (1994), S. 588-590 
    Details
    ISSN: 1573-9171
    Keywords: 1,3,4-oxadiazoles ; fluorodinitromethyl derivatives ; synthesis ; X-ray structural method ; polymorphism ; packing density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An X-ray structural study of 2,5-bis(fluorodinitromethyl)-1,3,4-oxadiazole (1), one of the representatives of azoles with strong electron-withdrawing substituents, has been carried out. It has been found that in the orthorhombic modification of1 the conformations of the fluorodinitromethyl groups are different. Intermolecular contacts in the crystal are realized through the heterocycles arranged at large angles to each other. The presence of strong electron-withdrawing substituents results in shortening of the C-O bonds and in a certain increase in the OCN angle in the 1,3,4-oxadiazole ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00699829
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Pyrazinoporphyrazine Derivatives Functionalised with Tetrathiafulvalene (TTF) Units: X-Ray Crystal Structures of Two Related ttf Cyclophanes and Two Bis(1,3-Dithiole-2-Thione) IntermediatesDedicated to Professor Fabian Gerson on the occasion of his retirement (1997)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 3 (1997), S. 1679-1690 
    Details
    ISSN: 0947-6539
    Keywords: crystal structure ; cyclophanes ; electrochemistry ; porphyrazines ; tetrathiafulvalenes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The pyrazinoporphyrazine system 13 (metal-free, zinc and copper derivatives) has been synthesised by tetramerisation of 2,3-dicyanopyrazine monomer unit 10. The structure of 13a-c has been established by 1H NMR spectroscopy, UV/Vis spectrophotometry, MALDI-TOF mass spectrometry, cyclic voltammetry and differential pulse voltammetry. The electrochemical redox behaviour of 13a-c is strongly solvent dependent. The expected two-stage oxidation of the tetrathiafulvalene (TTF) units of 13a-c was observed in a range of solvents; in addition, oxidation and reduction of the pyrazinoporphyrazine core of the metal-free derivative 13a was detected in benzonitrile. On excitation of 13 in the Q-band region no fluorescence was observed, which is presumably the consequence of intramolecular charge transfer between the TTF moieties and the excited state of the central porphyrazine. Molecular modelling studies on 13a and 13c are reported. During the course of this work, the novel TTF macrocycles 11 and 20 were synthesised; their X-ray crystal structures reveal severely bent TTF units, the conformations of which are discussed in detail. The X-ray crystal structures of the bis(1,3-dithiole) systems 15 and 18 have also been determined.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19970031018
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  • 6
    Electronic Resource
    Electronic Resource
    Röntgenstrukturanalyse von 15N-Nitridodichlorotris(dimethylphenylphenylphosphin)technetium(V) (1988)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 564 (1988), S. 129-134 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal and Molecular Structure of 15N-Nitridodichlorotris(dimethylphenylphenylphosphine)technetium(V)The title compound Tc15NCl2(Me2PhP)3 I has been prepared by the reaction of mer-TcCl3(Me2PhP)3 with Na15N3. The crystal structure of I has been determined by single crystal X-ray diffraction methods at room temperature. Crystals are orthorhombic, space group Pbca, with a = 16.663(1), b = 19.219(1), c = 16.769(1) Å and Z = 8. The technetium atom is six-coor-dinate. The coordination geometry is that of a distorted octahedron with 3 phosphine ligands in meridional positions. The strong trans influence of the nitrido ligand has been noted. The Tc—Cl length trans to N is 2.665(1) Å while those trans to P is 2.441(1) Å.
    Notes: Die Titelverbindung Tc15NCl2(Me2PhP)3 I wurde durch Reaktion von mer-TcCl3(Me2PhP)3 mit Na15N3 dargestellt und ihre Kristall- und Molekülstruktur durch Röntgenstrukturanalyse ermittelt. Die Kristalle sind orthorhombisch, Raumgruppe Pbca, mit a = 16,663(1), b = 19,219(1), c = 16,769(1) Å und Z = 8. Das Technetiumatom hat verzerrt oktaedrische Koordinationsgeometrie mit meridionaler Anordnung der Phosphine. Infolge des ausgeprägten trans-Effektes des Nitridoliganden ist der Tc—Cl-Bindungsabstand in trans-Stellung zum Nitridoliganden um 0,22 Å größer als jener, der sich in trans-Stellung zum Phosphinliganden befindet.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19885640118
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Röntgenstrukturanalyse von Tris(diethyldithiocarbamato) dimethylphenylphosphantechnetium(III), einem Technetium-Komplex mit der Koordinationszahl 7 (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 510 (1984), S. 117-122 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal and Molecular Structure of Tris(diethyldithiocarbamato)dimethylphenylphosphinetechnetium (III)The title compound Tc(S2CNEt2)3(Me2PhP) I has been prepared by the reaction of TcCl3(Me2PhP)3 with NaS2CNEt2. The crystal structure of I has been determined by single-crystal X-ray diffraction methods at room temperature. Crystals are rhombic, space group P212121, with a = 8.708(1), b = 12.012(1), c = 29.626(3) Å and Z = 4. The compound consists of discrete I molecules. The technetium atom has a seven-coordinated environment which is best described as a distorted pentagonal bipyramid. The Tc - P distance (2.330(3) Å) is remarkably short compared with other technetium complexes with mono-dentate phosphine ligands.
    Notes: Die Titelverbindung Tc(S2CNEt2)3(Me2PhP) I wurde durch Reaktion von TcCl3(Me2PhP)3 mit NaS2CNEt2 dargestellt und ihre Kristall- und Molekülstruktur durch Röntgenstrukturanalyse ermittelt. Die Kristalle sind rhombisch, Raumgruppe P212121, mit a = 8,708(1), b = 12,012(1), c = 29,626(3) Å und Z = 4. Die Verbindung besteht aus diskreten monomeren Molekülen. Das Technetiumatom hat siebenfache Koordination, die am besten als geringfügig verzerrte pentagonale Bipyramide beschrieben werden kann. Die Tc - P-Bindungslänge (2,330(3) Å) ist bemerkenswert kurz im Vergleich zu anderen Technetiumkomplexverbindungen mit einzähnigen Phosphanen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845100317
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