New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions

The reaction of 12H-quinoxaline[2,3-b]phenoxazine (QOPO) with lanthanide hexafluoroacetylacetonates is accompanied by protonation of the QOPO and leads to the formation of salts of the general formula [QOPOH]+[Ln(hfac)<inf>4</inf>]− (Ln = Nd, Dy, Tb, Ho), whose structures have been deter...

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Главные авторы:	Demidov, O. P., Демидов, О. П.
Формат:	Статья
Язык:	English
Опубликовано:	Elsevier Ltd 2025
Темы:	Crystal structures Nuclear magnetic resonance spectroscopy Fluorescence Hexafluoroacetylacetonates Lanthanides complexes Quinoxalinophenoxazines Single-ion magnets Complexation Dysprosium compounds Negative ions
Online-ссылка:	https://dspace.ncfu.ru/handle/123456789/31828
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spelling	ir-123456789-318282025-08-11T08:13:16Z New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions Demidov, O. P. Демидов, О. П. Crystal structures Nuclear magnetic resonance spectroscopy Fluorescence Hexafluoroacetylacetonates Lanthanides complexes Quinoxalinophenoxazines Single-ion magnets Complexation Dysprosium compounds Negative ions The reaction of 12H-quinoxaline[2,3-b]phenoxazine (QOPO) with lanthanide hexafluoroacetylacetonates is accompanied by protonation of the QOPO and leads to the formation of salts of the general formula [QOPOH]+[Ln(hfac)<inf>4</inf>]− (Ln = Nd, Dy, Tb, Ho), whose structures have been determined by X-ray diffraction analysis and 1H NMR spectroscopy. The compounds are characterized by long wavelength absorption and fluorescence (λ<inf>fl</inf> = 677–740 nm). The study of the magnetic properties of the complexes has revealed that the Tb complex exhibits slow magnetic relaxation under an applied dc field, while the Dy complex behaves as single-ion magnet (SIM) even at zero field. These two compounds are the first examples of anionic complexes based on Dy and Tb ions coordinated by four hexafluoroacetylacetonates that exhibit the SIM properties under zero and applied dc fields, respectively. 2025-08-11T08:11:13Z 2025-08-11T08:11:13Z 2025 Статья Ivakhnenko, P., Korchagin, D. V., Omelichkin, N. I., Shilov, G. V., Krainyukov, A. A., Zhidkov, M. V., Dmitriev, A. I., Demidov, O. Р., Knyazev, P. A., Chernyshev, A. V. New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions // Polyhedron. - 2025. - 280. - art. no. 117668. - DOI: 10.1016/j.poly.2025.117668 https://dspace.ncfu.ru/handle/123456789/31828 en Polyhedron application/pdf application/pdf Elsevier Ltd
institution	СКФУ
collection	Репозиторий
language	English
topic	Crystal structures Nuclear magnetic resonance spectroscopy Fluorescence Hexafluoroacetylacetonates Lanthanides complexes Quinoxalinophenoxazines Single-ion magnets Complexation Dysprosium compounds Negative ions
spellingShingle	Crystal structures Nuclear magnetic resonance spectroscopy Fluorescence Hexafluoroacetylacetonates Lanthanides complexes Quinoxalinophenoxazines Single-ion magnets Complexation Dysprosium compounds Negative ions Demidov, O. P. Демидов, О. П. New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions
description	The reaction of 12H-quinoxaline[2,3-b]phenoxazine (QOPO) with lanthanide hexafluoroacetylacetonates is accompanied by protonation of the QOPO and leads to the formation of salts of the general formula [QOPOH]+[Ln(hfac)<inf>4</inf>]− (Ln = Nd, Dy, Tb, Ho), whose structures have been determined by X-ray diffraction analysis and 1H NMR spectroscopy. The compounds are characterized by long wavelength absorption and fluorescence (λ<inf>fl</inf> = 677–740 nm). The study of the magnetic properties of the complexes has revealed that the Tb complex exhibits slow magnetic relaxation under an applied dc field, while the Dy complex behaves as single-ion magnet (SIM) even at zero field. These two compounds are the first examples of anionic complexes based on Dy and Tb ions coordinated by four hexafluoroacetylacetonates that exhibit the SIM properties under zero and applied dc fields, respectively.
format	Статья
author	Demidov, O. P. Демидов, О. П.
author_facet	Demidov, O. P. Демидов, О. П.
author_sort	Demidov, O. P.
title	New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions
title_short	New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions
title_full	New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions
title_fullStr	New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions
title_full_unstemmed	New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions
title_sort	new series of salts with 12h-quinoxalino[2,3-b]phenoxazinium cation and [ln(hfac)4]− anions
publisher	Elsevier Ltd
publishDate	2025
url	https://dspace.ncfu.ru/handle/123456789/31828
work_keys_str_mv	AT demidovop newseriesofsaltswith12hquinoxalino23bphenoxaziniumcationandlnhfac4anions AT demidovop newseriesofsaltswith12hquinoxalino23bphenoxaziniumcationandlnhfac4anions
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New series of salts with 12H-quinoxalino[2,3-b]phenoxazinium cation and [Ln(hfac)4]− anions

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