Tuning the photophysical and electrochemical properties of iridium(III) 2-aryl-1-phenylbenzimidazole complexes

Bezzubov, S.I.; Doljenko, V.D.; Troyanov, S.I.; Kiselev, Y.M.

Авторы: Bezzubov Stanislav I., Doljenko Vladimir D., Troyanov Sergey I., Kiselev Yuri M.
Журнал: Inorganica Chimica Acta
Том: 415
Год издания: 2014
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 22
Последняя страница: 30
DOI: 10.1016/j.ica.2014.02.024
Аннотация: A series of heteroleptic bis-cyclometalated iridium(III) complexes, [Ir(cpbi)2(H2dcbpy)][PF6] (1), [Ir(pbi)2(H2dcbpy)][PF6] (2), and [Ir(mpbi)2(H2dcbpy)][PF6] (3), where pbi = 1,2-diphenylbenzimidazole, cpbi = 2-(4-chlorophenyl)-1-phenylbenzimidazole, mpbi = 2-(3,4-dimethoxyphenyl)-1-phenylbenzimidazole, and H2dcbpy = 2,2’-bipyridine-4,4’-dicarboxylic acid has been synthesized and characterized by elemental analysis, 1H, 31P NMR, and high resolution mass-spectra. Molecular structure of complex 3 has been determined from single-crystal X-ray analysis. The complexes exhibit absorption up to 550 nm with molar absorptivities of 2500 M-1cm-1. They have strong luminescence in broad yellow-to-red region in solutions at room temperature. While chloro-substituent (complex 1) causes a little hypsochromic shift of the absorption maxima compared to unsubstitued 2, introduction of two methoxy-groups (complex 3) gives rise to a bathochromic shift of about 100 nm. Alternating current voltammetry studies of the complexes indicates reversible oxidation and reduction potentials. Calculated excited state oxidation potentials for 1–3 are negative enough to efficiently inject electrons into the conduction band of TiO2 (EF ≈ –0.5 V). Thus, from the electrochemical point of view, all the complexes, especially 3, are good candidates for operation in DSSC as dyes.
Добавил в систему: Долженко Владимир Дмитриевич

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Tuning the photophysical and electrochemical properties of iridium(III) 2-aryl-1-phenylbenzimidazole complexesстатья

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