Spin-selective electron transmission through self-assembled monolayers of double-stranded peptide nucleic acid.
Spin-selective electron transmission through self-assembled monolayers of double-stranded peptide nucleic acid.
复制标题
通过双链肽核酸自组装单层的自旋选择性电子传输。
作者：
P. Möllers;Selma Ulku;Dilhara R. Jayarathna;F. Tassinari;D. Nürenberg;R. Naaman;C. Achim;H. Zacharias
手性分子的单层膜可以优先传输具有特定自旋取向的电子，从而引入手性分子作为有效的自旋过滤器。这种现象被确定为手性诱导的自旋选择性（CISS），并首次在双链DNA（dsDNA）的自组装单层（SAM）中直接证明。在这里，我们讨论的自组装膜的双链肽核酸（dsPNA）作为一个系统，它允许系统的各种分子特性对CISS的影响的调查。在光电子能谱研究中，手性γ-修饰PNA的自组装膜显示出显著的自旋过滤，自旋极化率高达P =（24.4 ± 4.3）%。在缺乏手性单体的PNA中发现的偏振值相当低，约为P = 12%。结果证实，优选的自旋取向是直接链接到分子的手性，并表明自旋过滤能力的dsPNA螺旋可能会通过引入手性中心的构成肽单体。
Monolayers of chiral molecules can preferentially transmit electrons with a specific spin orientation, introducing chiral molecules as efficient spin filters. This phenomenon is established as chirality-induced spin selectivity (CISS) and was demonstrated directly for the first time in self-assembled monolayers (SAMs) of double-stranded DNA (dsDNA)1 . Here, we discuss SAMs of double-stranded peptide nucleic acid (dsPNA) as a system which allows for systematic investigations of the influence of various molecular properties on CISS. In photoemission studies, SAMs of chiral, γ-modified PNA show significant spin filtering of up to P = (24.4 ± 4.3)% spin polarization. The polarization values found in PNA lacking chiral monomers are considerably lower at about P = 12%. The results confirm that the preferred spin orientation is directly linked to the molecular handedness and indicate that the spin filtering capacity of the dsPNA helices might be enhanced by introduction of chiral centers in the constituting peptide monomers.