Viologen photooxidation of thiacarbocyanine dyes and their supramolecular complexes with cucurbit[8]uril

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Resumo

The photooxidation reaction of 3,3'-diethyl-9–methylthiacarbocyanine and 3,3'-diethylthiacarbocyanine by viologenes (methyl viologenes, p-chlorophenyl viologenes, p-cyanophenyl viologenes) in acetonitrile and their dimeric complexes with cucurbit[8]uril by monomeric complexes of viologenes in presence of cucurbit[8]uril in water has been studied. The products of photooxidation of dye monomers in acetonitrile are dye dication-radicals and cation-radicals of viologens. The photooxidation of dimeric complexes produces trication radicals of dimeric complexes and cation radicals of monomeric complexes of viologens. The most efficient reaction is the photooxidation of dyes in acetonitrile.

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Sobre autores

G. Zakharova

“Kurchatov Institute” National Research Center

Autor responsável pela correspondência
Email: gvzakharova@gmail.com

Kurchatov Complex “Crystallography and Photonics”, Photochemistry Center Department

Rússia, Moscow, 119421

T. Fedotova

“Kurchatov Institute” National Research Center

Email: tatyana.fedotova@phystech.edu

Kurchatov Complex “Crystallography and Photonics”, Photochemistry Center Department

Rússia, Moscow, 119421

A. Chibisov

“Kurchatov Institute” National Research Center

Email: alexander.chibisov@gmail.com

Kurchatov Complex “Crystallography and Photonics”, Photochemistry Center Department

Rússia, Moscow, 119421

Bibliografia

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2. Fig. 1. Time-resolved differential absorption spectra of Cd1 (1 × 10 – 5 mol/L) in the presence of MV (5 × 10 – 4 mol/l) in acetonitrile. The time of measurement of the spectra is shown in the frame. The insert shows kinetic curves of deactivation of the T-state of Cr1 in the presence of MV at 630 nm (1) and kinetic curves of formation of radical photoreaction products: Cr12+• at 460 nm (2) and MV+• at 390 nm (3).

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3. Fig. 2. Time-resolved difference absorption spectra of Cr12•2CB[8] in the presence of Cl-PV•CB[8]. The time of measurement of the spectra is shown in the frame. The insert shows the kinetic curves of deactivation of the T-state Cr12•2CB[8] (1) in the presence of Cl-PV•CB[8] and the kinetic curve of formation of radical photoreaction products: Cr123+••2CB[8] and Cl-PV+••CB[8] (2). Concentrations: Cr1 – 1 × 10 –5 mol / L, Cl – PV-1 × 10 -5 mol / L, CB[8] – 4 × 10 -5 mol / L.

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4. Fig. 3. Kinetic curves of attenuation of delayed fluorescence of Kr22•2CB[8] in the presence of MV. The insert shows a graphical definition of the quenching rate constant of delayed fluorescence by the MV•CB complex[8]. In the frame is the concentration of MV. The concentration of Cd2 is 1.2 × 10 – 6 mol / l, the concentration of CB[8] is 5 × 10 – 5 mol / L.

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