A Mixed Valence CoIICoIII2 Field-Supported Single Molecule Magnet: Solvent-Dependent Structural Variation

One-pot reaction of the Schiff base N,N'-ethylene bis(salicylaldimine) (H2L), CoCl2.6H2O, and [Ph2SnCl2] in acetone produces the mixed valence CoIICoIII2 compound [CoIICoIII2(μ-L)2(Ph)2(μ-Cl)2]·(CH3)2CO·H2O (1). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic SnIVCoIII (2) or monometallic CoIII complex (3), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic CoIICoIII2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as τ~0.6 s at T = 2.0 K and BDC = 1.0 T.

Авторы
Hazra S.1 , Rajnák C.2 , Titiš J.2 , Guedes Da Silva M.F.C. , Boča R.2 , Pombeiro A.J.L. 1, 3
Журнал
Издательство
MDPI AG
Номер выпуска
4
Язык
Английский
Статус
Опубликовано
Том
26
Год
2021
Организации
  • 1 Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco PaisLisbon 1049-001, Portugal
  • 2 Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, Trnava, 91701, Slovakia
  • 3 Peoples' Friendship University of Russia (RUDN University), 6 Miklukho-Maklaya StreetMoscow 117198, Russian Federation
Ключевые слова
mixed valence; organometallic; pH shift; Schiff base; single molecule magnet; structural variation
Дата создания
20.04.2021
Дата изменения
20.04.2021
Постоянная ссылка
https://repository.rudn.ru/ru/records/article/record/72116/
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