1976
DOI: 10.1139/v76-109
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An exciplex mechanism for the quenching of singlet excited states of aliphatic ketones by carbon tetrachloride

Abstract: RAFIK 0. LOUTFY and ALLAN C. SOMERSALL. Can. J. Chem. 54, 760 (1976). Non-classical energy transfer from the excited singlet states of aliphatic ketones to carbon tetrachloride leads to sensitized decomposition products and fluorescence quenching. The correlation of the ionization potentials for a wide variety of such ketones with the corresponding quenching constants from fluorescence data has been rationalized by an exciplex mechanism. The correlation implies that charge transfer from the excited ketone to t… Show more

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Cited by 22 publications
(8 citation statements)
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“…The energy loss into the singlet state manifold may proceed through emission of radiation (reaction [2]) or radiationless processes via the external spin-orbital coupling with CCl, molecule, internal conversion (reaction [3]) or via complexation (reactions [4] and [5] 3 zole molecule show that among a variety of mesomeric structures of the radical-cation, the l , 3 , 6 , 8 , and 9(N) positions are likely to be favored (1 1, 12).…”
Section: Resultsmentioning
confidence: 99%
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“…The energy loss into the singlet state manifold may proceed through emission of radiation (reaction [2]) or radiationless processes via the external spin-orbital coupling with CCl, molecule, internal conversion (reaction [3]) or via complexation (reactions [4] and [5] 3 zole molecule show that among a variety of mesomeric structures of the radical-cation, the l , 3 , 6 , 8 , and 9(N) positions are likely to be favored (1 1, 12).…”
Section: Resultsmentioning
confidence: 99%
“…commonly connected with the photochemical reacCarbon tetrachloride is a well-known fluorestion in which CC14 participates as an electron cence quencher of various aromatic electron do-acceptor, favorable conditions being created by the nors (1)(2)(3)(4)(5)(6). The mechanism of quenching is most distinctive electron affinity of CCl, (2.12 eV) (7) and comparatively low C-Cl bond energy (23 1.2 kJ 'On leave from the Department of Chemistry, University of mol-') (8).…”
Section: Introductionmentioning
confidence: 99%
“…Molecular interactions are taken for the analysis of quenching results with two different models (i) stern Volmer plots (ii) Smoluchowski-type quenching model [5][6][7]. Fluorescence quenching of aromatic hydrocarbons by haloalkanes was studied [7][8][9][10][11][12][13][14]. When the overlap of donor emission and acceptor absorption is negligible, quenching was justified in terms of a non-emissive exciplex [9] and its formation can only be inferred and not observed [15].…”
Section: Introductionmentioning
confidence: 99%
“…Carbon tetrachloride is well known to be an efficient fluorescence quencher of a large variety of organic molecules (1,2,(26)(27)(28)(29)(30)(31)(32). The fluorescence quenching process has usually been explained by the exciplex formation between the singlet excited molecule and the CCI, molecule.…”
Section: Introductionmentioning
confidence: 99%