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  • Structure  (2)
  • Selenium Ultramarine  (1)
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  • 1
    ISSN: 0044-2313
    Keywords: Copper(II) isothiocyanate complexes ; Structure ; EPR Spectra ; phase transitions ; redox properties ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Isothiocyanate Complexes of Copper(II) with Square-Planar and Tetragonal-Pyramidal Coordination: Structure, Phase Transitions, and Redox-PropertiesIn dependence on the kind and size of the counter-cations Cu2+-ions form isothiocyanate complexes with different coordination number and geometry. The structures of compounds with square-planar coordination [(NEt4)2[Cu(NCS)4] · CHCl3 (brown): Space group 14/mmm, Z = 2; a = 1204.3(2) pm, c = 1154.2(3) pm] and with tetragonal-pyramidal polyhedra [(NEt4)3[Cu(NCS)5] · SM (green, SM: unidentified solvent molecule): Space group P21/c, Z = 4; a = 1154.2(6) pm, b = 2291.6(10) pm, c = 1739.9(9) pm, ß = 95.98(5)°] are reported. The green complex transforms into a brown compound at room-temperature; the transformation is (partly) reversibly. Solutions of NCS-anions and Cu2+ are redox unstable. The structure of a resulting product: (PPh4)2[Cu2(NCS)2] [Space group C2/c, Z = 4; a = 1235.4(1) pm, b = 1347.1(2) pm, c = 2953.4(11) pm, ß = 99.36(2)°] with Cu(I) dimers and two bridging NCS- ligands is also reported.
    Notes: Cu2+-Ionen bilden in Abhängigkeit von der Art und Größe des Gegenkations Isothiocyanant-Komplexe verschiedener Koordinationszahl und Geometrie. Es wird über die Struktur von Verbindungen mit quadratisch-planarer Koordination [(NEt4)2[Cu(NCS)4] · CHCl3 (braun): Raumgruppe 14/mmm, Z = 2; a = 1204,3(2) pm, c = 1154,3(3) pm] und mit tetragonalpyramidalen Polyedern [(NEt4)3[Cu(NCS)5] · LM (grün; LM: nicht eindeutig identifizierbare Lösungsmittel-Moleküle): Raumgruppe P21/c, Z = 4; a = 1154,2(6) pm, b = 2291,6(10) pm, c = 1739,9(9) pm, ß = 95,98(5)°] berichtet. Die grüne Verbindung wandelt sich bei Raumtemperatur in eine braune Form um; die Umwandlung ist (partiell) reversibel. Lösungen, die NCS-b- und Cu2+- Ionen enthalten, sind redoxinstabil. Die Struktur eines farblosen Folgeprodukts: (PPH4)2[Cu2(NCS)4] [Raumgruppe C2/c, Z = 4; a = 1235,4(1) pm, b =1347,1(2) pm, c = 2953,4(11)pm, ß = 99,36(2)°] mit dimeren Kupfer(I)-Einheiten und zwei über N- und S-Ligatoratome gebundenen, verbrückenden Thiocyanationen wird beschrieben.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 1321-1328 
    ISSN: 0044-2313
    Keywords: Selenium Ultramarine ; Preparation ; Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis, Colour, and Structure of a red Selenium UltramarineThe synthesis conditions for a brilliant red selenium ultramarine with pigment properties are reported. Structural and electron-microscopic investigations indicate, that these compounds possess the nosean structure with underoccupied Na+ and anionic positions, which contain the colour-determining species. It is concluded by applying various spectroscopic methods that the colour is generated by Se2- radicals. Hydrothermally grown single crystals were pink, with only very small amounts of Se2- being present, which were distinctly spectroscopically but not structurally detectable.
    Notes: Es wird über die Synthese eines brillant-roten Selen-Ultramarins mit Pigmenteigenschaften berichtet. Strukturelle und elektronenmikroskopische Untersuchungen ergaben, daß die Nosean-Struktur mit unterbesetzter Na+-Lage und einer ebenfalls defizitären anionischen Position, die die farbgebende Spezies enthält, vorliegt. Spektroskopische Messungen deuten darauf, daß die Farbe auf das radikalische Anion Se2- zurückgeht. Hydrothermal gezüchtete Einkristalle sind rosa und enthalten nur sehr geringe Mengen an Se2-, die spektroskopisch deutlich, doch strukturell nicht nachweisbar waren.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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