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  • 1
    Electronic Resource
    Electronic Resource
    β-K2SO4-Type Isomorphs: Prediction of Structures and Refinement of Rb2CrO4 (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 115-120 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The crystal structures of members within a group of isostructural compounds may be successfully predicted. This is demonstrated for the β-K2SO4 group isomorphs with the general formula M2XO4, which were chosen as a family of very closely related compounds nearly all with accurately refined crystal structures. The unit-cell parameters and the fractional atomic coordinates are shown to exhibit systematic variations with both cation and anion size, as well as the Mulliken charge on the O atom in the tetrahedral anion. This allows the prediction of the crystal structures of members in the series, with only the chemical composition of the compound being known. The agreement is good, except for an early structure determination of Rb2CrO4. The now refined structure gives excellent agreement with that predicted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010876819701152X
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  • 2
    Electronic Resource
    Electronic Resource
    Calculation of Structural Parameters in Isostructural Series: the Kieserite Group (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 564-567 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In order to demonstrate the possibility of predicting the structural parameters of members in a sequence of isostructural compounds, the kieserite group isotypes (with the general formula MIIXO4.H2O) were chosen since a number of them have accurately refined crystal structures. The unit-cell parameters and the fractional atomic coordinates were shown to vary linearly with both cation and anion size. This makes it possible to calculate the structural parameters of a particular member, taking into account only the effective ionic radii of the constituent atoms. Agreement between the calculated and experimentally refined (by X-ray diffraction) structural parameters is good. The cell constants and atomic coordinates of FeSeO4.H2O, iron selenate monohydrate, are predicted in this way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768198000974
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Double sulfates of cobalt(II), nickel(II), copper(II) and zinc(II) with trimethylammonium cation: synthesis, identification and thermal decomposition
    Amsterdam : Elsevier
    Thermochimica Acta 228 (1993), S. 102-110 
    Details
    ISSN: 0040-6031
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0040-6031(93)80279-J
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis, characterization and thermal decomposition of double monomethylammonium sulfates of cobalt, nickel, copper and zinc (1992)
    Springer
    Journal of thermal analysis and calorimetry 38 (1992), S. 1563-1570 
    Details
    ISSN: 1572-8943
    Keywords: double sulphates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus dem Reaktionsgemisch von Kobalt(II)-, Nickel(II)-, Kupfer(II)- und Zinksulfat mit Monomethylammoniumsulfat im Molverhältnis 1∶3 werden die Doppelsulfate der entsprechenden Metalle mit dem Monomethylammoniumkation erhalten. Die erhaltenen Verbindungen wurden mittels Röntgen-Pulverdiffraktion, TG, DSC und Elementaranalyse untersucht. Es wurde festgestellt, daß die allgemeine Formel der Doppelsulfate (CH3NH3)2M(SO4)2· 6H2O beträgt und daß es sich bei den Kobalt-, Nickel- und Zinkverbindungen um isostrukturelle Verbindungen handelt. Es wird die Beziehung zwischen Kristallstruktur und thermischer Zersetzung besprochen.
    Notes: Abstract Double sulfates of cobalt(II), nickel(II), copper(II) and zinc with the monomethylammonium cation were obtained from the reaction mixture of the corresponding metal sulfate and monomethylammonium sulfate in a molar ratio of 1∶3. The obtained compounds were studied by the methods of X-ray powder diffraction, TG and DSC analysis and elemental analysis. It was found that the double sulfates have the formula (CH3NH3)2M(SO4)2· 6H2O, and that the cobalt, nickel and zinc compounds are isostructural. The relationship between crystal structure and thermal decomposition is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01979353
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    Paper (German National Licenses)
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