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Delayed fluorescence of 3,3′-diethylthiacarbocyanine in the presence of cucurbit [7]uril

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Abstract

Cationic dye 3,3-diethylthiacarbocyanine (TCC) in a phosphate buffer solution (pH 6.86) in the presence of cucurbit[7]uril (CB7) occurs in the form of monomeric TCC@CB7 and dimeric (TCC@CB7)2 complexes. The TCC@CB7 and (TCC@CB7)2 complexes display fast (conventional) and delayed (thermally activated, of type E) fluorescence, as well as free TCC. The relative yield of fast fluorescence of TCC@CB7 is six times that of free TCC. The delayed fluorescence lifetimes τdfl of TCC@CB7 and (TCC@CB7)2 are 0.5 and 1.6 ms, respectively. In the presence of p-nitroacetophenone (electron acceptor), the delayed fluorescence of (TCC@CB7)2 is quenched dynamically with the rate constant of 7 × 108 L mol—1s—1.

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Authors and Affiliations

  1. Center of Photochemistry, Russian Academy of Sciences, ul. Novatorov 7a, Moscow, 119421, Russia

    G. V. Zakharova & A. K. Chibisov

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  1. G. V. Zakharova
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  2. A. K. Chibisov
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Correspondence to G. V. Zakharova.

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Original Russian Text © G.V. Zakharova, A.K. Chibisov, 2016, published in Khimiya Vysokikh Energii, 2016, Vol. 50, No. 5, pp. 388—390.

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Zakharova, G.V., Chibisov, A.K. Delayed fluorescence of 3,3′-diethylthiacarbocyanine in the presence of cucurbit [7]uril. High Energy Chem 50, 368–370 (2016). https://doi.org/10.1134/S0018143916050192

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  • DOI: https://doi.org/10.1134/S0018143916050192

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