偶氮苯
光异构化
材料科学
电子顺磁共振
双稳态
分子
光化学
磁铁
自旋电子学
辐照
化学物理
异构化
化学
核磁共振
光电子学
聚合物
凝聚态物理
物理
铁磁性
有机化学
量子力学
生物化学
核物理学
复合材料
催化作用
作者
T.K. Prasad,Giordano Poneti,Lorenzo Sorace,M.J. Rodriguez-Douton,Anne‐Laure Barra,Petr Neugebauer,Luca Costantino,Roberta Sessoli,Andrea Cornia
出处
期刊:Dalton Transactions
[The Royal Society of Chemistry]
日期:2012-01-01
卷期号:41 (27): 8368-8368
被引量:26
摘要
Tetrairon(III) complexes known as "ferric stars" have been functionalized with azobenzene groups to investigate the effect of light-induced trans–cis isomerization on single-molecule magnet (SMM) behaviour. According to DC magnetic data and EPR spectroscopy, clusters dispersed in polystyrene (4% w/w) exhibit the same spin (S = 5) and magnetic anisotropy as bulk samples. Ligand photoisomerization, achieved by irradiation at 365 nm, has no detectable influence on static magnetic properties. However, it induces a small but significant acceleration of magnetic relaxation as probed by AC susceptometry. The pristine behaviour can be almost quantitatively recovered by irradiation with white light. Our studies demonstrate that magnetic and optical bistability can be made to coexist in SMM materials, which are of current interest in molecular spintronics.
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