Light-Induced Spin State Switching in Copper(II)-Nitroxide-Based Molecular Magnet at Room Temperature,The Journal of Physical Chemistry Letters

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Light-Induced Spin State Switching in Copper(II)-Nitroxide-Based Molecular Magnet at Room Temperature
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2017-11-02 00:00:00 , DOI: 10.1021/acs.jpclett.7b02497
Xu Dong ₁ , Maciej Lorenc ₁ , Evgeny V. Tretyakov _{2,

3} , Victor I. Ovcharenko ₂ , Matvey V. Fedin _{2,

3}

Affiliation

Molecular magnets Cu(hfac)₂L^R exhibit an unusual type of photoinduced magnetostructural switching in exchange-coupled copper(II)-nitroxide clusters. Such photoswitching from strongly coupled to weakly coupled spin state (SS → WS) was recently found to be ultrafast, thus enhancing the interest in these systems and the scope of their potential applications. However, to date such SS → WS photoswitching was demonstrated only at cryogenic temperatures, being limited by the absence of suitable SS states and short relaxation times at T > 100 K. In this work we selected model compound Cu(hfac)₂L^iso-Pr residing in the mixed SS/WS state at room temperature and investigated it using femtosecond optical spectroscopy. Photoinduced spin dynamics was detected, and an ultrafast SS → WS photoswitching was for the first time demonstrated at room temperature, constituting an important milestone in the development of copper(II)-nitroxide molecular magnets for practical purposes.

中文翻译：

室温下基于铜（II）-一氧化氮的分子磁体中的光诱导自旋态转换

分子磁体Cu（hfac）₂ L ^R在交换耦合的铜（II）-氮氧化物簇中表现出不同寻常的光致磁结构转换。从光耦合从强耦合到弱耦合自旋状态（SS→WS）的光开关最近被发现是超快的，因此增强了人们对这些系统的兴趣及其潜在应用范围。然而，迄今为止，仅在低温下才证明了这种SS→WS的光开关，这是由于缺乏合适的SS状态和T > 100 K时弛豫时间短而限制的。在这项工作中，我们选择了模型化合物Cu（hfac）₂ L ^iso-镨在室温下以混合SS / WS状态存在，并使用飞秒光谱法对其进行了研究。检测到光诱导的自旋动力学，并首次在室温下证明了超快SS→WS光开关，这构成了实用的铜（II）-氮氧杂环丁烷分子磁体开发中的重要里程碑。

更新日期：2017-11-03

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