Depletion of singlet and triplet states of 1-amino-5, 6, 7, 8-tetrahydronaphthalene due to external heavy-atom perturbation |
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Authors: | K Chatterjee S Chakravorti T Ganguly S B Banerjee |
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Institution: | (1) Optics Department, Indian Association for the Cultivation of Science, Jadavpur, 700 032 Calcutta, India |
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Abstract: | 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.
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.
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Keywords: | Photochemistry and radiation chemistry |
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