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The Time-Resolved Fluorescence Stokes Shift of Cucurbit[6]Uril Complexes with a Pyridinium Styryl Dye

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Abstract

The time-resolved Stokes shift of fluorescence of styryl dye, trans-4-[4-(dimethylamino)-styryl]-1-methylpyridinium iodide (DASPI), and its host-guest complexes with cucurbit[6]uril (CB[6]) was studied by up-conversion technique on a 5 ps time scale. In all cases, the solvation time correlation function – that describes relaxation of the fluorescent state - contains two components. The time constant of the first component, which is related to the vibrational relaxation of the dye cation, increases from 118 fs without CB[6] to 224 fs in the presence CB[6]. It suggests the production of CB[6] complexes to disturb the hydrogen-bond net in the vicinity of DASPI cation. The time constant of the second component, which is associated with solvation, changes from 0.81 ps without CB[6] to 1.15 ps in the presence of the cavitand. The observed increase can be related to the displacement of the dye cation deeper into CB[6] that allows considering DASPI-CB[6] complexes as a light-controlled molecular machine with a response time on the picosecond scale.

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Acknowledgements

The work was supported by the Russian Science Foundation (project no. 14-13-00751) and in part by the Federal Agency of Scientific Organizations.

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Authors and Affiliations

  1. Photochemistry Center RAS, FSRC «Crystallography and Photonics» RAS, ul. Novatorov 7A, 119421, Moscow, Russia

    N. Kh. Petrov, D. A. Ivanov, I. V. Kryukov, Yu. A. Shandarov & M. V. Alfimov

  2. Moscow Institute of Physics and Technology (State University), Institutsky per. 9, 141707, Dolgoprudny, Russia

    N. Kh. Petrov, A. D. Svirida & M. V. Alfimov

Authors
  1. N. Kh. Petrov
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  2. D. A. Ivanov
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  3. I. V. Kryukov
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  4. A. D. Svirida
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  5. Yu. A. Shandarov
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  6. M. V. Alfimov
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Correspondence to D. A. Ivanov.

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Petrov, N.K., Ivanov, D.A., Kryukov, I.V. et al. The Time-Resolved Fluorescence Stokes Shift of Cucurbit[6]Uril Complexes with a Pyridinium Styryl Dye. J Fluoresc 28, 883–887 (2018). https://doi.org/10.1007/s10895-018-2256-x

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  • DOI: https://doi.org/10.1007/s10895-018-2256-x

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