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Charge transfer adducts of rare earth 3,5-dinitrobenzoates with N,N,N′,N′-tetramethyl-p-phenylenediamineстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 26 августа 2016 г.
- Авторы: Koroteev P.S., Ilyukhin A.B., Efimov N.N., Ugolkova E.A., Dobrokhotova Z.V., Minin V.V., Novotortsev V.M.
- Журнал: Inorganica Chimica Acta
- Том: 442
- Год издания: 2016
- Издательство: Elsevier BV
- Местоположение издательства: Netherlands
- Первая страница: 86
- Последняя страница: 96
- DOI: 10.1016/j.ica.2015.11.025
- Аннотация: Crystallization of products of an exchange reaction between LnCl3·6H2O and potassium 3,5-dinitrobenzoate from acetonitrile in the presence of N,N,N′,N′-tetramethyl-p-phenylenediamine (TMPD) and DMSO results in two types of charge transfer adducts: [Ln2(O2CC6H3(NO2)2)6(DMSO)4]·TMPD·2MeCN (type A) and [Ln2(O2CC6H3(NO2)2)6(DMSO)4]·3TMPD (type B). Type A adducts were isolated in pure form for Tb(1), Dy(2a), Ho(3a), Er(4a) and Y(5a), whereas type B adduct was isolated for Er (4b). Crystallization in the absence of TMPD gives coordination polymers, [Ln(O2CC6H3(NO2)2)3(DMSO)2]n (Ln = Tb (8), Dy (9)) and [Ln(O2CC6H3(NO2)2)3(DMSO)]n·nMeCN (Ln = Ho (10), Er (11), Y (12)). In the case of Sm and Gd, the [Ln(O2CC6H3(NO2)2)3(DMSO)2]n coordination polymers (Ln = Sm (6), Gd (7)) are formed even with a large excess of TMPD. In the case of Tb, the [Tb(O2CC6H3(NO2)2)3(DMSO)(H2O)]n·0.5nTMPD·1.5nDMSO·0.5nCH3CN polymer (13) was isolated in a small yield in the presence of excess TMPD. Due to charge transfer between TMPD molecules and [Ln2(O2CC6H3(NO2)2)6(DMSO)4] fragments, stacking interactions occur that determine the supramolecular structures of the compounds. Spectral studies of these compounds indicate that a charge transfer structure predominates over an ion radical structure; however, according to EPR studies, the charge transfer moieties in the compounds are significantly paramagnetic. The magnetic properties of 1, 2a, 3a and 4b complexes correspond to predominance of antiferromagnetic interactions in all cases. Complex 2a manifests SMM properties. © 2015 Elsevier B.V.
- Добавил в систему: Новоторцев Владимир Михайлович