The 1:1 Host-Guest Complexation between Cucurbit[7]uril and Styryl Dyeстатья

Статья опубликована в высокорейтинговом журнале

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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.

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[1] The 1:1 host-guest complexation between cucurbit[7]uril and styryl dye / D. A. Ivanov, N. K. Petrov, E. A. Nikitina et al. // The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment & general theory. — 2011. — Vol. 115, no. 17. — P. 4505–4510. The photophysical properties of aqueous solution of styryl dye, 4-[(E)-2-(3,4-dimethoxyphenypethenyl]-1-ethylpyridinium perchlorate (dye 1), in the presence of cucurbit[7]util (CB[7]) was studied by means of fluorescence spectroscopy methods. The production of 1:1 host guest complexes in the range of CB [7] concentrations up to 16 mu M with K = 1.0 X 10(6) M(-1) has been observed, which corresponds to appearance of the isosbestic point at 396 nm in the absorption spectra and a 5-fold increase in fluorescence intensity. The decay of fluorescence was found to fit to double-exponential functions in all cases; the calculated average fluorescence lifetime increases from 145 to 352 ps upon the addition of CB [7]. Rotational relaxation times of dye 1 solutions 119 +/- 14 ps without CB [7] and 277 +/- 35 ps in the presence of CB [7] have been determined by anisotropy fluorescence method. The comparison of the results of quantum-chemical calculations and experimental data confirms that in the host cavity dye 1 rotates as a whole with CB[7]. [ DOI ]

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