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Spin-induced asymmetry reaction—The formation of asymmetric carbon by electropolymerization
Science Advances ( IF 13.6 ) Pub Date : 2022-08-10 , DOI: 10.1126/sciadv.abq2727
Deb Kumar Bhowmick 1 , Tapan Kumar Das 1 , Kakali Santra 1 , Amit Kumar Mondal 1 , Francesco Tassinari 1, 2 , Rony Schwarz 3 , Charles E Diesendruck 3 , Ron Naaman 1
Affiliation  

We describe the spin polarization–induced chirogenic electropolymerization of achiral 2-vinylpyridine, which forms a layer of enantioenhanced isotactic polymer on the electrode. The product formed is enantioenriched in asymmetric carbon polymer. To confirm the chirality of the polymer film formed on the electrode, we also measured its electron spin polarization properties as a function of its thickness. Two methods were used: First, spin polarization was measured by applying magnetic contact atomic force microscopy, and second, magnetoresistance was assessed in a sandwich-like four-point contact structure. We observed high spin-selective electron transmission, even for a layer thickness of 120 nm. A correlation exists between the change in the circular dichroism signal and the change in the spin polarization, as a function of thickness. The spin-filtering efficiency increases with temperature.

中文翻译:

自旋诱导不对称反应——通过电聚合形成不对称碳

我们描述了非手性 2-乙烯基吡啶的自旋极化诱导的手性电聚合,它在电极上形成了一层对映增强的全同立构聚合物。形成的产物富含不对称碳聚合物。为了确认在电极上形成的聚合物膜的手性,我们还测量了其电子自旋极化特性作为其厚度的函数。使用了两种方法:首先,通过应用磁接触原子力显微镜测量自旋极化,其次,在三明治状四点接触结构中评估磁阻。我们观察到高自旋选择性电子传输,即使层厚为 120 nm。作为厚度的函数,圆二色性信号的变化和自旋极化的变化之间存在相关性。
更新日期:2022-08-10
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