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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 422 (1976), S. 65-74 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Light Induced Redox Reactions of Mono-oxalate-bis(phenanthroline) Cobalt(III) Complexes in Solid StatePhoto redox reactions on complexes of the type [Co(phen)2ox]X · n H2O (phen = 1,10 phenanthroline, ox = C2O4-; X- = F, Cl, Rr, I, HCOO, C3H7COO, ClO4; n = 1-3) are discussed. They are initiated from irradiations in the 350 nm region. Thin layers of the compounds and KBr pellets of the complexes were photolyzed and quantum yield values were determined by IR-spectroscopic or analytical determination of concentration. Quantum yield values were found to be dependent on different anions X in the second coordination sphere. The brutto reactions mere characterized analytically and by spectroscopic methods and magnetic measurements. The products of photolysis were identified. A mechanism of light induced reactions is proposed on base of stoichiometry of the reactions and of identification of oxalate anion radicals by EPR.
    Notes: Es wird über Photoredoxreaktionen an Komplexen des Typs [Co(phen)2ox]X · nH2O (phen = 1,10-Phenanthrolin, ox = C2O4-; X- = F, Cl, Br, J, HCOO, C3H7COO, ClO4; n = 1-3) im festen Zustand berichtet, die durch Einstrahlung bei 350 nm ausgelöst werden. Durch Photolyse an dünnen Schichten und in KBr-Preßlingen wurden die Quantenausbeuten der Photoredoxreaktionen über naßanalytische bzw. IR-spektroskopische Konzentrationsermittlung in Abhängigkeit von unterschiedlichen Anionen X ermittelt. Der Bruttoumsatz der Photolysereaktionen wurde analytisch, mittels spektroskopischer Methoden sowie magnetochemisch bestimmt und die Endprodukte wurden identifiziert. Auf Grund der Stöchiometrie der Reaktion und dem EPR-spektroskopischen Nachweis von Oxalatanionradikalen wird ein Mechanismus für den Ablauf der Reaktion vorgeschlagen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photocatalytic Systems. XLIV. On the Intervalence Charge Transfer Behaviour of Ion Pairs of Octacyanomolybdate[Mo(CN)8]4- ions are forming coloured ion pairs with FeIII, CuII, UVIO2, and VIVO, the long-wavelength absorption band of which could be assigned to an intervalence charge-transfer transition. From the solvent dependence of the IT band, interionic distances could be estimated.
    Notes: [Mo(CN)8]4--Ionen bilden mit FeIII, CuII, UVIO2 und VIVO farbige Ionenpaarassoziate, deren langwellige Absorptionsbanden Intervalence-Charge-Transfer-Übergängen zugeordnet werden können. Durch Auswertung der Lösungsmittelabhängigkeit der IT-Bande konnten die interionischen Abstände ermittelt werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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