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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
    ISSN: 0044-2313
    Keywords: Osmium Polysulfido Complex ; Synthesis ; IR Spectrum ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal Structure of Tetraphenylphosphonium Aqua-bis(tetrasulfido)thionitrosyl Osmate, PPh4[Os(NS)(S4)2(H2O)]PPh4[Os(NS)(S4)2(H2O)] has been prepared as redbrown crystals by reacting PPh4[OsNCl4] with a solution of excess disodium tetrasulfide in dimethylformamide/H2O and characterized by IR spectroscopy and by a crystal structure determination. Space group P21/n, Z = 4, structure solution with 4162 independent reflections, R = 0.059 for reflections with I 〉 2σ(I). Lattice dimensions at -40°C: a = 1138.9(5), b = 1301.4(4), c = 2092.7(7) pm, β = 104.74(3)º. Os—N, Os—O, and Os—S distances are 175.2(12), 219.8(12), and 237.5(4)-239.1(4) pm, respectively. The Os=N=S moiety is approximately linear, with an OsNS angle of 171.2(7)º.
    Notes: PPh4[Os(NS)(S4)2(H2O)] wurde als rotbraune Kristalle durch Reaktion von PPh4[OsNCl4] mit einer Lösung von überschüssigem Dinatriumtetrasulfid in Dimethylformamid/H2O hergestellt und durch das IR-Spektrum und eine Kristallstrukturanalyse charakterisiert. Raumgruppe P21/n, Z = 4, Strukturlösung mit 4162 unabhängigen Reflexen, R = 0,059 für Reflexe mit I 〉 2σ(I). Gitterabmessungen bei -40°C: a = 1138,9(5); b = 1301,4(4); c = 2092,7(7) pm, β = 104.74(3)º. Die Abstände Os—N, Os—O und Os—S betragen 175,2(12), 219,8(12) und 237,5(4) - 239,1(4) pm. Die Os=N=S-Gruppe ist mit einem Bindungswinkel von 171,2(7)º annähernd linear.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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