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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 8 (1986), S. 541-552 
    ISSN: 0392-6737
    Keywords: Photochemistry and radiation chemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si riporta lo spegnimento di luminescenza dell' l-amino-5, 6, 7, 8-tetraidronaftalene (ATHN) in solventi non polari e polari a 300 K e 77 K mediante i cloroalcani tetracloruro di metilene (CH2Cl2). Si determinano diversi parametri fotofisici a 77 K di ATHN fluorescente perturbato e non perturbato in soluzioni ternarie. La constante (K q) del valore di smorzamento di fluorescenza dinamico bimolecolare aumenta con l'affinità elettronica (EA) degli spegnitori ed esiste una correlazione lineare tra lnK q ed EA. Lo spegnimento dipende dalla polarità dei solventi. Lo spegnimento è attribuito all'exciplex CT di contatto formato tra cloroalcani e ATHN a singoletti eccitati.
    Notes: Summary Quenching of luminescence of 1-amino-5, 6, 7, 8-tetrahydronaphthalene (ATHN) in nonpolar and polar solvents at 300 K and 77 K by the chloroalkanes carbon tetrachloride (CCl4), methyl chloroform (CH3CCl3), chloroform (CHCl3) and methylene chloride (CH2Cl2) is reported. Different photophysical parameters at 77 K of unperturbed and perturbed fluorescer ATHN in ternary solutions are determined. The bimolecular dynamic fluorescence quenching rate constant (K q) increases with the electron affinity (EA) of the quenchers and a linear correlation exists between lnK q and EA. The quenching depends on polarity of solvents. The quenching is ascribed to contact CT exciplex formed between chloroalkanes and excited singlet ATHN.
    Type of Medium: Electronic Resource
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