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Crown-ether styryl dyes .16. Betaines of photochromic 15-crown-5 ethers and their complexes with Mg2+: A surface enhanced Raman scattering spectroscopy studyстатья
Информация о цитировании статьи получена из
Web of Science
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 27 мая 2015 г.
- Авторы: Feofanov A.V., Ianoul A.I., Oleinikov V.A., Nabiev I.R., Gromov S.P., Fedorova O.A., Alfimov M.V.
- Журнал: Russian Chemical Bulletin
- Том: 44
- Номер: 12
- Год издания: 1995
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 2323
- Последняя страница: 2330
- DOI: 10.1007/BF00713602
- Аннотация: The surface enhanced Raman scattering (SERS) spectra of styryl dyes containing a crown-ether group and a heteroaromatic residue with sulfoalkyl (1a) or alkyl (1b) N-substituent and of their complexes with Mg2+ cations were recorded in the 10(-4)-10(-8) mol L(-1) concentration range. A model for the interaction of compounds 1a,b with a silver surface during their adsorption on an electrochemically treated electrode was suggested. Fast cis-trans relaxation of the adsorbed molecules 1a,b and complexes (1a,bMg2+ was found. It was shown that at [1a] = 10(-5) mol L(-1) and moderate molar ratios (C-Mg/[1a] = 3/1 to 9/1) in acetonitrile solutions, (trans-1aMg2+ complexes are joined into head-to-tail type dimers. An excess of Mg2+ cations (c(Mg)/[1a] > 100) leads to dissociation of the dimers yielding (trans-1a)(Mg2+)(2) complexes. The formation of dimers from complexes (trans-1aMg2+ is accompanied by a substantial distortion of the planar structure of trans-1a. This may be an important factor influencing the efficiency of photocycloaddition involving dimers of (trans-1a) Mg2+.
- Добавил в систему: Громов Сергей Пантелеймонович