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The First Series of Heterometallic LnIII-VIV Complexes Based on Substituted Malonic Acid Anions: Synthesis, Structure and Magnetic Propertiesстатья
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 25 ноября 2020 г.
- Авторы: Bazhina E.S., Aleksandrov G.G., Kiskin M.A., Korlyukov A.A., Efimov N.N., Bogomyakov A.S., Starikova A.A., Mironov V.S., Ugolkova E.A., Minin V.V., Sidorov A.A., Eremenko I.L.
- Журнал: European Journal of Inorganic Chemistry
- Том: 2018
- Номер: 47
- Год издания: 2018
- Издательство: John Wiley & Sons Ltd.
- Местоположение издательства: United Kingdom
- Первая страница: 5075
- Последняя страница: 5090
- DOI: 10.1002/ejic.201801034
- Аннотация: The reaction of VOSO4 with K2cbdc (cbdc2– is cyclobutane- 1,1-dicarboxylate anion) and Ln(NO3)3 (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Y, Er, Tm, Yb, Lu) yielded 17 novel heterometallic LnIII-VIV compounds comprising stable bischelate units {VIVO(cbdc)2(H2O)}. Three structural types of compounds are formed depending on the nature of the rare-earth metal: 1D polymers {[Ln(VO)(cbdc)2(H2O)7]·0.5[VO(cbdc)2]}n (structural type I) [Ln = La (1), Ce (2)], 3D polymers {[KLn(VO)2(cbdc)4(H2O)9]·3.5H2O}n (structural type II) [Ln = La (3), Ce (4), Pr (5), Nd (6), Sm (7), Eu (8), Gd (9), Tb (10), Dy (11), Ho (12)] comprising trinuclear units {LnV2}, and octanuclear complexes {[KLn(VO)2(cbdc)4(H2O)11]·2H2O}2 (structural type III) [Ln = Y (13), Er (14), Tm (15), Yb (16), Lu (17)] containing dinuclear units {LnV}. Magnetic properties were investigated for all isolated compounds. The GdIII-VIV compound has ferromagnetic and antiferromagnetic exchange interactions between isotropic VIV and GdIII ions. Calculations using the DFT method at the UB3LYP/6-31G(d,p)/SDD level of theory were performed in order to explain the different nature of exchange interactions in two GdIII-VIV pairs. The YbIII-VIV complex displays single-molecule magnet properties; the effective energy barrier was estimated at ΔEeff/kB = 26 K. The magnetic properties of LnIII-VIV compounds with heavy lanthanide ions (LnIII = Er, Tm, Yb) were rationalized in terms of crystal-field calculations for LnIII ions.
- Добавил в систему: Бажина Евгения Сергеевна