Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex,Chemical Science

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Hard X-ray magnetochiral dichroism in a paramagnetic molecular 4f complex
Chemical Science ( IF 7.6 ) Pub Date : 2020-07-30 , DOI: 10.1039/d0sc02709j
Dmitri Mitcov _{1,

2,

3,

4} , Mikhail Platunov _{5,

6,

7} , Christian D. Buch _{1,

2,

3,

4} , Anders Reinholdt _{1,

2,

3,

4} , Anders R. Døssing _{1,

2,

3,

4} , Fabrice Wilhelm _{5,

6,

7} , Andrei Rogalev _{5,

6,

7} , Stergios Piligkos _{1,

2,

3,

4}

Affiliation

Magnetochiral dichroism (MΧD) originates in the coupling of local electric fields and magnetic moments in systems where a simultaneous break of space parity and time-reversal symmetries occurs. This magnetoelectric coupling, displayed by chiral magnetic materials, can be exploited to manipulate the magnetic moment of molecular materials at the single molecule level. We demonstrate herein the first experimental observation of X-ray magnetochiral dichroism in enantiopure chiral trigonal single crystals of a chiral mononuclear paramagnetic lanthanide coordination complex, namely, holmium oxydiacetate, at the Ho L₃-edge. The observed magnetochiral effect is opposite for the two enantiomers and is rationalised on the basis of a multipolar expansion of the matter–radiation interaction. These results demonstrate that 4f–5d hybridization in chiral lanthanoid coordination complexes is at the origin of magnetochiral dichroism, an effect that could be exploited for addressing of their magnetic moment at the single molecule level.

中文翻译：

顺磁性分子4f配合物中的硬X射线磁magnet二色性

磁极二向色性（MΧD）起源于系统中局部电场和磁矩的耦合，在这种系统中，同时发生空间奇偶性和时间反转对称性的破坏。通过手性磁性材料表现出的这种磁电耦合可以用来在单分子水平上操纵分子材料的磁矩。在本文中，我们证明了在手性单核顺磁性镧系元素配位化合物，即氧化双乙酸hol的对映纯手性三角单晶体中，X射线磁二色性的第一个实验观察结果是在Ho L _3上-边缘。对于两种对映体，观察到的磁热效应是相反的，并且在物质-辐射相互作用的多极扩展的基础上合理化。这些结果表明，手性镧系配位化合物中的4f-5d杂交是磁二向色性的起源，可以利用这种效应解决单分子水平的磁矩。

更新日期：2020-08-12

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