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Magnetic properties of novel dendrimeric spin crossover iron(III) complex

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dc.contributor.author Domracheva N.
dc.contributor.author Vorobeva V.
dc.contributor.author Pyataev A.
dc.contributor.author Tamura R.
dc.contributor.author Suzuki K.
dc.contributor.author Gruzdev M.
dc.contributor.author Chervonova U.
dc.contributor.author Kolker A.
dc.date.accessioned 2018-09-19T20:11:56Z
dc.date.available 2018-09-19T20:11:56Z
dc.date.issued 2016
dc.identifier.issn 0020-1693
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/142675
dc.description.abstract © 2015 Elsevier B.V. All rights reserved. The synthesis and magnetic properties of novel dendrimeric spin crossover Fe(III) complex of formula [Fe(L)2]+PF6 -, where L = 3,5-di(3,4,5-tris(tetradecyloxy)benzoyloxy)benzoyl-4-oxy-salicylidene-N′-ethyl-N-ethylenediamine have been studied for the first time by magnetic susceptibility, Electron Paramagnetic Resonance (EPR) and Mössbauer spectroscopy in the wide (2-300 K) temperature range. EPR showed that the compound is magnetically inhomogeneous, consists of two magnetic sub-lattices, displays a partial spin crossover (S=5/2 1/2) of ∼25% of the Fe(III) molecules above 160 K and undergoes the antiferromagnetic (AF) ordering below 10 K. High-spin (HS, S = 5/2) Fe(III) centers with weakly distorted octahedral environment most probably form chains in layers. The dimeric molecules, formed from low-spin (LS, S = 1/2) centers and HS centers with strongly distorted octahedral environment are likely located between the layers and are involved in the spin crossover. EPR has shown the presence of AF dynamical spin clusters in the high temperature (70-300 K) range, which are visible in the short time scale (10-10 s) and could not be registered in the static magnetic measurements. Mössbauer spectra demonstrated in a paramagnetic state of the compound a quadrupole doublet with average isomer shift of 0.35 mm/s and splitting 0.72 mm/s corresponding to HS Fe(III) centers. Below 60 K, the spectra displayed the appearance of magnetic hyperfine structure, whose relaxation nature testifies the collective spin flips of small clusters in the material. Mössbauer spectroscopy confirmed the existence of AF ordering in the Fe(III) dendrimeric complex at 5 K.
dc.relation.ispartofseries Inorganica Chimica Acta
dc.subject Dendrimers
dc.subject EPR spectroscopy
dc.subject Iron(III) complex
dc.subject Magnetic susceptibility
dc.subject Mössbauer spectroscopy
dc.subject Spin-crossover
dc.title Magnetic properties of novel dendrimeric spin crossover iron(III) complex
dc.type Article
dc.relation.ispartofseries-volume 439
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 186
dc.source.id SCOPUS00201693-2016-439-SID84946595209


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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