Strong Coupling and Slow Relaxation of the Magnetization for an Air-Stable [Co4] Square with Both Tetrazine Radicals and Azido Bridges

Autor:	Zoe Pikramenou, Zhilin Guo, Kim R. Dunbar, Yi-Fei Deng, Yuan-Zhu Zhang
Rok vydání:	2021
Předmět:	Inorganic Chemistry Coupling constant Crystallography Magnetization Tetrazine chemistry.chemical_compound Chemistry Metal ions in aqueous solution Radical Relaxation (NMR) Antiferromagnetism Physical and Theoretical Chemistry Spin (physics)
Zdroj:	Inorganic Chemistry. 60:3651-3656
ISSN:	1520-510X 0020-1669
DOI:	10.1021/acs.inorgchem.0c03158
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e7d7afcef10bf6735c547098afd9cbbd https://doi.org/10.1021/acs.inorgchem.0c03158 Zobrazit plný text záznamu