Strong coupling and slow relaxation of the magnetization for an air-stable [Co4] square with both tetrazine radicals and azido bridges

Zhilin Guo; Yi-Fei Deng; Zoe Pikramenou; Kim R Dunbar; Yuan-Zhu Zhang

doi:10.1021/acs.inorgchem.0c03158

Strong coupling and slow relaxation of the magnetization for an air-stable [Co₄] square with both tetrazine radicals and azido bridges

Zhilin Guo
, Yi-Fei Deng
, Zoe Pikramenou
, Kim R Dunbar
, Yuan-Zhu Zhang

Research output: Contribution to journal › Article › peer-review

Abstract

Introducing both tetrazine radical and azido bridges afforded two air-stable square complexes [M^II₄(bpztz^•–)4(N₃)₄] (M^II = Zn²⁺, 1; Co^2+, 2; bpztz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine), where the metal ions are cobridged by μ_1,1-azido bridges and tetrazine radicals. Magnetic studies revealed strong antiferromagnetic metal–radical interaction with a coupling constant of −64.7 cm^–1 in the 2J formalism in 2. Remarkably, 2 exhibits slow relaxation of magnetization with an effective barrier for spin reverse of 96 K at zero applied field.

Original language	English
Pages (from-to)	3651-3656
Number of pages	6
Journal	Inorganic Chemistry
Volume	60
Issue number	6
Early online date	3 Mar 2021
DOIs	https://doi.org/10.1021/acs.inorgchem.0c03158
Publication status	Published - 15 Mar 2021

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10.1021/acs.inorgchem.0c03158

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title = "Strong coupling and slow relaxation of the magnetization for an air-stable [Co4] square with both tetrazine radicals and azido bridges",

abstract = "Introducing both tetrazine radical and azido bridges afforded two air-stable square complexes [MII4(bpztz•–)4(N3)4] (MII = Zn2+, 1; Co2+, 2; bpztz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine), where the metal ions are cobridged by μ1,1-azido bridges and tetrazine radicals. Magnetic studies revealed strong antiferromagnetic metal–radical interaction with a coupling constant of −64.7 cm–1 in the 2J formalism in 2. Remarkably, 2 exhibits slow relaxation of magnetization with an effective barrier for spin reverse of 96 K at zero applied field. ",

author = "Zhilin Guo and Yi-Fei Deng and Zoe Pikramenou and Dunbar, \{Kim R\} and Yuan-Zhu Zhang",

year = "2021",

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doi = "10.1021/acs.inorgchem.0c03158",

language = "English",

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T1 - Strong coupling and slow relaxation of the magnetization for an air-stable [Co4] square with both tetrazine radicals and azido bridges

AU - Guo, Zhilin

AU - Deng, Yi-Fei

AU - Pikramenou, Zoe

AU - Dunbar, Kim R

AU - Zhang, Yuan-Zhu

PY - 2021/3/15

Y1 - 2021/3/15

N2 - Introducing both tetrazine radical and azido bridges afforded two air-stable square complexes [MII4(bpztz•–)4(N3)4] (MII = Zn2+, 1; Co2+, 2; bpztz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine), where the metal ions are cobridged by μ1,1-azido bridges and tetrazine radicals. Magnetic studies revealed strong antiferromagnetic metal–radical interaction with a coupling constant of −64.7 cm–1 in the 2J formalism in 2. Remarkably, 2 exhibits slow relaxation of magnetization with an effective barrier for spin reverse of 96 K at zero applied field.

AB - Introducing both tetrazine radical and azido bridges afforded two air-stable square complexes [MII4(bpztz•–)4(N3)4] (MII = Zn2+, 1; Co2+, 2; bpztz = 3,6-bis(3,5-dimethylpyrazolyl)-1,2,4,5-tetrazine), where the metal ions are cobridged by μ1,1-azido bridges and tetrazine radicals. Magnetic studies revealed strong antiferromagnetic metal–radical interaction with a coupling constant of −64.7 cm–1 in the 2J formalism in 2. Remarkably, 2 exhibits slow relaxation of magnetization with an effective barrier for spin reverse of 96 K at zero applied field.

U2 - 10.1021/acs.inorgchem.0c03158

DO - 10.1021/acs.inorgchem.0c03158

M3 - Article

C2 - 33656338

SN - 0020-1669

VL - 60

SP - 3651

EP - 3656

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 6

ER -

Strong coupling and slow relaxation of the magnetization for an air-stable [Co4] square with both tetrazine radicals and azido bridges

Abstract

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Strong coupling and slow relaxation of the magnetization for an air-stable [Co₄] square with both tetrazine radicals and azido bridges