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Supramolecular Maleate Adducts of Copper(II) 12-Metallacrown-4: Magnetism, EPR, and Alcohol Sorption Propertiesстатья
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: 24 февраля 2021 г.
- Авторы: Pavlishchuk Anna V., Kolotilov Sergey V., Zeller Matthias, Lofland Samuel E., Kiskin Mikhail A., Efimov Nikolay N., Ugolkova Elena A., Minin Vadim V., Novotortsev Vladimir M., Addison Anthony W.
- Журнал: European Journal of Inorganic Chemistry
- Том: 2017
- Номер: 41
- Год издания: 2017
- Издательство: John Wiley & Sons Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 4866
- Последняя страница: 4878
- DOI: 10.1002/ejic.201700976
- Аннотация: With maleate, [Cu5(ahpha)4]2+ gives two complexes, [Cu5(ahpha)4(DMF)2](MalH)2·2DMF (1) and [Cu5(ahpha)4(MalH)2] (2) (ahpha2– is 3‐amino‐3‐hydroximinopropane hydroxamate; MalH2 is maleic acid). Both 1 and 2 contain non‐oligomerized [Cu5(ahpha)4]2+ metallacrown blocks; in 1, two MalH– are bound to [Cu5(ahpha)4]2+ only via H‐bonds, while in 2, they coordinate to Cu2+. The X‐band EPR of 1 was observed at 20 K, 100 K, and 295 K. The EPR at 20 K was of an S = 1/2 ground state, while at room temperature anisotropic |ΔMs| = 1 and |ΔMs| = 2 resonances around 3200 G (g ≈ 2.19) and 1600 G (g ≈ 4.25) were observed for the Cu5 system, due to partial occupation of an S = 3/2 state. The room temperature EPR of 1 was simulated as the weighted sum of the spectra of its various S = 1/2, 3/2, and 5/2 states. Its magnetic behavior was fitted with a χMT vs. T model using a spin Hamiltonian accounting for central–peripheral (J1), peripheral–peripheral (J2) Cu2+–Cu2+ and intercrown (zJ′) spin interactions, yielding J1 = –156(4) cm–1, J2 = –63(1) cm–1, and zJ′ = –4.5(3) cm–1. For sorption of methanol and ethanol vapors at 293 K by a desolvated polycrystalline sample of 1, the shape of the adsorption and desorption isotherms indicated a “gates opening” phenomenon.
- Добавил в систему: Уголкова Елена Александровна