Single-Chain Magnets Based on Octacyanotungstate with the Highest Energy Barriers for Cyanide Compounds

By introducing large counter cations as the spacer, two isolated 3, 3-ladder compounds, (Ph(4)P)[Co(II)(3-Mepy)(2.7)(H(2)O)(0.3)W(V)(CN)(8)]·0.6H(2)O (1) and (Ph(4)As)[Co(II)(3-Mepy)(3)W(V)(CN)(8)] (2, 3-Mepy = 3-methylpyridine), were synthesized and characterized. Static and dynamic magnetic charac...

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Detalles Bibliográficos
Autores principales: Wei, Rong-Min, Cao, Fan, Li, Jing, Yang, Li, Han, Yuan, Zhang, Xiu-Ling, Zhang, Zaichao, Wang, Xin-Yi, Song, You
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4829875/
https://www.ncbi.nlm.nih.gov/pubmed/27071451
http://dx.doi.org/10.1038/srep24372
Descripción
Sumario:By introducing large counter cations as the spacer, two isolated 3, 3-ladder compounds, (Ph(4)P)[Co(II)(3-Mepy)(2.7)(H(2)O)(0.3)W(V)(CN)(8)]·0.6H(2)O (1) and (Ph(4)As)[Co(II)(3-Mepy)(3)W(V)(CN)(8)] (2, 3-Mepy = 3-methylpyridine), were synthesized and characterized. Static and dynamic magnetic characterizations reveal that compounds 1 and 2 both behave as the single-chain magnets (SCMs) with very high energy barriers: 252(9) K for 1 and 224(7) K for 2, respectively. These two compounds display the highest relaxation barriers for cyano-bridged SCMs and are preceded only by two cobalt(II)-radical compounds among all SCMs. Meanwhile, a large coercive field of 26.2 kOe (1) and 22.6 kOe (2) were observed at 1.8 K.