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'Fluorescence quenching' in keywords Facet   Publication Year 1994  [X]
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1Author    Michael Kom, JörnK. Üster, Herbert DreeskampRequires cookie*
 Title    Einfluß des Silberkations auf das Fluoreszenzverhalten polyzyklischer aromatischer Kohlenwasserstoffe  
 Abstract    Com bining the results o f fluorescence and triplet-triplet absorption measurements, the influence o f silver perchlorate on the excited states o f pyrene, phenanthrene, 9-cyanophenanthrene, 9,10-diphenylanthracene and 9,10-dicyanoanthracene in fluid solutions has been investigated. In corre­ spondence with a small energy gap between the lowest excited singlet state and the nearest lower triplet state an external heavy atom effect has been found to be responsible for the fluorescence quenching in the case o f pyrene, phenanthrene and 9-cyanophenanthrene. In the case o f 9,10-diphenylanthracene and 9,10-dicyanoanthracene, where this energy gap is large, an exciplex emission is observed with no significant increase o f triplet state formation. Furthermore, 9-cyanophenanthrene and 9,10-dicyanoanthracene under similar experimental conditions form ground state complexes with A gC 104 with a red-shifted fluorescence. From time-resolved fluorescence m easurements a dynamic equilibrium o f association in the excited state is deduced. 
  Reference    Z. Naturforsch. 49a, 578 (1994); eingegangen am 7. Februar 1994 
  Published    1994 
  Keywords    Fluorescence quenching, Silver ions, External heavy atom effect, Exciplex, Ground state com plexation 
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 TEI-XML for    default:Reihe_A/49/ZNA-1994-49a-0578.pdf 
 Identifier    ZNA-1994-49a-0578 
 Volume    49