Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case

Two new copper(ii) complexes have been obtained by the reaction of sterically crowded triphenodioxazine ligands with Cu(ii) hexafluoroacetylacetonate. Compound 1 is a co-crystal of Cu(hfac)2 moieties and triphenodioxazine molecules within a quasi-one-dimensional crystal structure with only weak Cu⋯N...

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Autori principali:	Demidov, O. P., Демидов, О. П.
Natura:	Статья
Lingua:	English
Pubblicazione:	2023
Soggetti:	Bond length Triphenodioxazine Copper compounds Crystal structure Ground state Magnetic susceptibility Magnetization Temperature distribution Copper complexes Cu complexes Cu(hfac)2 Hexafluoroacetylacetonates Quasi-one dimensional Relaxation of magnetization Slow magnetic relaxations Slow relaxations
Accesso online:	https://dspace.ncfu.ru/handle/20.500.12258/26220
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spelling	ir-20.500.12258-262202023-12-29T11:13:05Z Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case Demidov, O. P. Демидов, О. П. Bond length Triphenodioxazine Copper compounds Crystal structure Ground state Magnetic susceptibility Magnetization Temperature distribution Copper complexes Cu complexes Cu(hfac)2 Hexafluoroacetylacetonates Quasi-one dimensional Relaxation of magnetization Slow magnetic relaxations Slow relaxations Two new copper(ii) complexes have been obtained by the reaction of sterically crowded triphenodioxazine ligands with Cu(ii) hexafluoroacetylacetonate. Compound 1 is a co-crystal of Cu(hfac)2 moieties and triphenodioxazine molecules within a quasi-one-dimensional crystal structure with only weak Cu⋯N short intermolecular interactions (Cu⋯N distances are equal to 2.69(1) and 2.75(1) Å). In contrast, complex 2 has a binuclear structure with two Cu(hfac)2 units bridged through triphenodioxazine ligand with the covalent Cu-N bond length of 2.335(2) Å. The magnetic AC susceptibility data show that in spite of the absence of zero-field splitting in the Cu(ii) ion having the ground state with spin S = 1/2, both compounds demonstrate slow magnetic relaxation at the applied magnetic field. For a quasi-one-dimensional complex 1, the optimal field for observing slow magnetic relaxation is 400 Oe, while for the binuclear complex it is 2500 Oe. The observed temperature dependence of the relaxation time in 1 is well described by the combination of Raman and direct mechanisms of relaxation, while for complex 2 the inclusion of Raman mechanism and quantum tunneling of magnetization is required to describe the relaxation behavior. 2023-12-29T11:12:21Z 2023-12-29T11:12:21Z 2023 Статья Korchagin, D.V., Ivakhnenko, E.P., Demidov, O.P., Knyazev, P.A., Efimov, N.N., Morgunov, R.B., Starikov, A.G., Palii, A.V., Minkin, V.I., Aldoshin, S.M. Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case // New Journal of Chemistry. - 2023. - 47 (46). - pp. 21353-21360. - DOI: 10.1039/d3nj04614a http://hdl.handle.net/20.500.12258/26220 en New Journal of Chemistry application/pdf application/pdf
institution	СКФУ
collection	Репозиторий
language	English
topic	Bond length Triphenodioxazine Copper compounds Crystal structure Ground state Magnetic susceptibility Magnetization Temperature distribution Copper complexes Cu complexes Cu(hfac)2 Hexafluoroacetylacetonates Quasi-one dimensional Relaxation of magnetization Slow magnetic relaxations Slow relaxations
spellingShingle	Bond length Triphenodioxazine Copper compounds Crystal structure Ground state Magnetic susceptibility Magnetization Temperature distribution Copper complexes Cu complexes Cu(hfac)2 Hexafluoroacetylacetonates Quasi-one dimensional Relaxation of magnetization Slow magnetic relaxations Slow relaxations Demidov, O. P. Демидов, О. П. Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
description	Two new copper(ii) complexes have been obtained by the reaction of sterically crowded triphenodioxazine ligands with Cu(ii) hexafluoroacetylacetonate. Compound 1 is a co-crystal of Cu(hfac)2 moieties and triphenodioxazine molecules within a quasi-one-dimensional crystal structure with only weak Cu⋯N short intermolecular interactions (Cu⋯N distances are equal to 2.69(1) and 2.75(1) Å). In contrast, complex 2 has a binuclear structure with two Cu(hfac)2 units bridged through triphenodioxazine ligand with the covalent Cu-N bond length of 2.335(2) Å. The magnetic AC susceptibility data show that in spite of the absence of zero-field splitting in the Cu(ii) ion having the ground state with spin S = 1/2, both compounds demonstrate slow magnetic relaxation at the applied magnetic field. For a quasi-one-dimensional complex 1, the optimal field for observing slow magnetic relaxation is 400 Oe, while for the binuclear complex it is 2500 Oe. The observed temperature dependence of the relaxation time in 1 is well described by the combination of Raman and direct mechanisms of relaxation, while for complex 2 the inclusion of Raman mechanism and quantum tunneling of magnetization is required to describe the relaxation behavior.
format	Статья
author	Demidov, O. P. Демидов, О. П.
author_facet	Demidov, O. P. Демидов, О. П.
author_sort	Demidov, O. P.
title	Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
title_short	Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
title_full	Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
title_fullStr	Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
title_full_unstemmed	Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
title_sort	field-assisted slow relaxation of magnetization in cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case
publishDate	2023
url	https://dspace.ncfu.ru/handle/20.500.12258/26220
work_keys_str_mv	AT demidovop fieldassistedslowrelaxationofmagnetizationincuiicomplexeswithpentaheterocyclictriphenodioxazineligandsthequasionedimensionalversusthebinuclearcase AT demidovop fieldassistedslowrelaxationofmagnetizationincuiicomplexeswithpentaheterocyclictriphenodioxazineligandsthequasionedimensionalversusthebinuclearcase
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Field-assisted slow relaxation of magnetization in Cu(ii) complexes with pentaheterocyclic triphenodioxazine ligands: the quasi-one-dimensional versus the binuclear case

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