Long magnetic relaxation time of tetracoordinate Co2+ in imidazo[1,5-a] pyridinium-based (C13H12N3)2[CoCl4] hybrid salt and [Co(C13H12N3)Cl3] molecular complex

Olga Yu Vassilyeva, Elena A. Buvaylo, Vladimir N. Kokozay, Brian W. Skelton, Cyril Rajnák, Ján Titiš, Roman Boča

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Abstract

The novel organic-inorganic hybrid salt [L]2[CoCl4] (1) and molecular complex [CoLCl3] (2), where L+ is 2-methyl-3-(pyridin-2-yl)imidazo[1,5-a]pyridinium cation, feature simple {CoCl4} and {CoCl3N} tetrahedral environments of negligible (1) and a slightly higher distortion (2) that are responsible for rather low positive magnetic anisotropy of CoII ion with D/hc = 12.1(6) (1) and 19.4(15) cm-1 (2). Both compounds exhibit field-induced slow magnetic relaxation with three relaxation channels [low- (LF), intermediate- and high-frequency (HF) modes] that is frequency and field dependent. With the increased DC field, the peaks referring to the LF relaxation path are moved to lower frequencies so that the applied DC field causes prolongation of the relaxation time. The opposite is true for the HF relaxation branch: the peak is moved to higher frequencies. Considering the simplicity of the coordination environment and moderate magnetic anisotropy of the metal ion in 1 and 2, the compounds are unique with respect to the remarkably long relaxation time for a given applied DC field and temperature: τLF = 0.54(4) s at BDC = 1.0 T and T = 2.0 K for 1, and τLF = 1.8(2) s at BDC = 1.2 T and T = 1.9 K for 2.

Original languageEnglish
Pages (from-to)11278-11284
Number of pages7
JournalDalton Transactions
Volume48
Issue number30
DOIs
Publication statusPublished - 27 Jun 2019

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Magnetic relaxation
Magnetic anisotropy
Relaxation time
Salts
Metal ions
Cations
Ions
Temperature

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Vassilyeva, Olga Yu ; Buvaylo, Elena A. ; Kokozay, Vladimir N. ; Skelton, Brian W. ; Rajnák, Cyril ; Titiš, Ján ; Boča, Roman. / Long magnetic relaxation time of tetracoordinate Co2+ in imidazo[1,5-a] pyridinium-based (C13H12N3)2[CoCl4] hybrid salt and [Co(C13H12N3)Cl3] molecular complex. In: Dalton Transactions. 2019 ; Vol. 48, No. 30. pp. 11278-11284.
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abstract = "The novel organic-inorganic hybrid salt [L]2[CoCl4] (1) and molecular complex [CoLCl3] (2), where L+ is 2-methyl-3-(pyridin-2-yl)imidazo[1,5-a]pyridinium cation, feature simple {CoCl4} and {CoCl3N} tetrahedral environments of negligible (1) and a slightly higher distortion (2) that are responsible for rather low positive magnetic anisotropy of CoII ion with D/hc = 12.1(6) (1) and 19.4(15) cm-1 (2). Both compounds exhibit field-induced slow magnetic relaxation with three relaxation channels [low- (LF), intermediate- and high-frequency (HF) modes] that is frequency and field dependent. With the increased DC field, the peaks referring to the LF relaxation path are moved to lower frequencies so that the applied DC field causes prolongation of the relaxation time. The opposite is true for the HF relaxation branch: the peak is moved to higher frequencies. Considering the simplicity of the coordination environment and moderate magnetic anisotropy of the metal ion in 1 and 2, the compounds are unique with respect to the remarkably long relaxation time for a given applied DC field and temperature: τLF = 0.54(4) s at BDC = 1.0 T and T = 2.0 K for 1, and τLF = 1.8(2) s at BDC = 1.2 T and T = 1.9 K for 2.",
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Long magnetic relaxation time of tetracoordinate Co2+ in imidazo[1,5-a] pyridinium-based (C13H12N3)2[CoCl4] hybrid salt and [Co(C13H12N3)Cl3] molecular complex. / Vassilyeva, Olga Yu; Buvaylo, Elena A.; Kokozay, Vladimir N.; Skelton, Brian W.; Rajnák, Cyril; Titiš, Ján; Boča, Roman.

In: Dalton Transactions, Vol. 48, No. 30, 27.06.2019, p. 11278-11284.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Long magnetic relaxation time of tetracoordinate Co2+ in imidazo[1,5-a] pyridinium-based (C13H12N3)2[CoCl4] hybrid salt and [Co(C13H12N3)Cl3] molecular complex

AU - Vassilyeva, Olga Yu

AU - Buvaylo, Elena A.

AU - Kokozay, Vladimir N.

AU - Skelton, Brian W.

AU - Rajnák, Cyril

AU - Titiš, Ján

AU - Boča, Roman

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N2 - The novel organic-inorganic hybrid salt [L]2[CoCl4] (1) and molecular complex [CoLCl3] (2), where L+ is 2-methyl-3-(pyridin-2-yl)imidazo[1,5-a]pyridinium cation, feature simple {CoCl4} and {CoCl3N} tetrahedral environments of negligible (1) and a slightly higher distortion (2) that are responsible for rather low positive magnetic anisotropy of CoII ion with D/hc = 12.1(6) (1) and 19.4(15) cm-1 (2). Both compounds exhibit field-induced slow magnetic relaxation with three relaxation channels [low- (LF), intermediate- and high-frequency (HF) modes] that is frequency and field dependent. With the increased DC field, the peaks referring to the LF relaxation path are moved to lower frequencies so that the applied DC field causes prolongation of the relaxation time. The opposite is true for the HF relaxation branch: the peak is moved to higher frequencies. Considering the simplicity of the coordination environment and moderate magnetic anisotropy of the metal ion in 1 and 2, the compounds are unique with respect to the remarkably long relaxation time for a given applied DC field and temperature: τLF = 0.54(4) s at BDC = 1.0 T and T = 2.0 K for 1, and τLF = 1.8(2) s at BDC = 1.2 T and T = 1.9 K for 2.

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M3 - Article

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JF - Dalton Transactions: the international journal for inorganic, organometallic and bioinorganic chemistry

SN - 1477-9226

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