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Magnetically bistable cobalt-dioxolene complexes with tetradentate N-donor baseстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Chegerev Maxim, Korchagin Denis V., Shilov Gennady V., Efimov N.N., Starikov Andrey, Piskunov Alexandr Vladimirovich, Chernyshev Anatoly V., Bulgakov Alexei, Minkin Vladimir I., Palii Andrei, Aldoshin Sergey M.
- Журнал: Dalton Transactions
- Год издания: 2022
- Издательство: Royal Society of Chemistry
- Местоположение издательства: United Kingdom
- DOI: 10.1039/d2dt02874c
- Аннотация: Synthesis and magnetic characterization of the family of cobalt-dioxolene complexes [(Me2TPA)Co(36-DBCat)] (1),[(Me2TPA)Co(36-DBCat)](PF6) (2) and [(Me2TPA)Co(diox-(OMe)3)](BPh4) (3) (Me2TPA = bis(6-methyl-2-pyridyl)methyl)-(2-pyridylmethyl)amine; 36-DBCat = dianion of 3,6-di-tert-butylcatechol; diox-(OMe)3 - 2,5-di-tert-butyl-3,3,4-trimethoxy-6-oxocyclohexa-1,4-dienolate) is reported. The neutral complex 1 is found to form hexa- (CoO2N4, 1a) and pentacoordinated(CoO2N3, 1b) isomers. Variable temperature single crystal X-ray diffraction analysis for 1a and 1b clearly indicates thepresence of the high-spin divalent metal ion and the dianionic catecholate form of the dioxolene ligand. Oxidation of 1 byferrocenium hexafluorophosphate results in the formation of the ionic octahedral complex 2, demonstrating thermallyinduced valence-tautomeric transition (ls-CoIII-36-DBCat ⇄ hs-CoII-36-DBSQ) in solid state with T1/2 = 175 K (36-DBSQ =radical-anionic semiquinonate form of the redox-ligand). In contrast, aerial oxidation of 1 is accompanied by changes in thestructure of dioxolene resulting in oxocyclohexadienolate ligand and formation of ionic complex of high-spin divalent cobalt(3). Compounds 1a, 1b, and 3 are found to demonstrate a field-induced single-ion magnet behavior. The analysis of theelectronic structures of 1, 2 and 3 with the aid of DFT and SA-CASSCF/NEVPT2 calculations is also given.
- Добавил в систему: Алдошин Сергей Михайлович