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Cation spin-crossover complexes of Mn(III) with 3,5-dihalogen-substituted ligands of the sal2323 family and the paramagnetic counterion [Co(pdms)2]2−статья
- Авторы: Tiunova Aleksandra V., Korchagin Denis V., Shilov Gennady V., Manakin Yuriy V., Dmitriev Aleksei I., Zhidkov Mikhail V., Kazakova Anna V., Aldoshin Sergey M., Yagubskii Eduard B.
- Журнал: Polyhedron
- Том: 277
- Год издания: 2025
- Издательство: Pergamon Press
- Местоположение издательства: United States
- Номер статьи: 117568
- DOI: 10.1016/j.poly.2025.117568
- Аннотация: The cationic complexes of Mn(III) with the 3,5-diHal-sal2323 ligands ((3,5-diHal-sal2323 = N,N′-bis(3-(2-oxy3,5-diHal-benzylideneamino)propyl)-ethylenediamine); Hal = Cl/Cl, Br/Cl, Br/Br) and a paramagnetic doublycharged counterion [Co(pdms)2]2− (H2pdms = 1,2-bis(methanesulfonamide)benzene) have been synthesized:{[Mn(3,5-diCl-sal2323)]2[Co(pdms)2]}⋅(H2O)x (1), {[Mn(3,5-Br,Cl-sal2323)]2[Co(pdms)2]}⋅(H2O)x (2), and{[Mn(3,5-diBr-sal2323)]2[Co(pdms)2]}⋅(H2O)x (3). Their crystal structures and magnetic properties have beenstudied. These two-component ionic compounds are isostructural and exhibit thermally induced incomplete spintransition in the temperature range 100–350 K associated with the cationic subsystem and a strong uniaxialmagnetic anisotropy associated with the anionic subsystem. A study of ac the magnetic susceptibility in zeromagnetic field and with a constant magnetic field applied has shown that the slow magnetic relaxation previously found in [Co(pdms)2]2− complexes with some diamagnetic cations is suppressed in 1–3. In structure 1–3there are shortened distances between the Co and Mn ions (6.75–6.76 Å), which may lead to significant dipole–dipole interactions between the spin centres, promoting very fast magnetic relaxation associated withquantum tunneling of the magnetization.
- Добавил в систему: Алдошин Сергей Михайлович