Orbital Specific Chirality and Homochiral Self-Assembly of Achiral Molecules Induced by Charge Transfer and Spontaneous Symmetry Breaking
Orbital Specific Chirality and Homochiral Self-Assembly of Achiral Molecules Induced by Charge Transfer and Spontaneous Symmetry Breaking
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DOI：
10.1103/physrevlett.105.115702
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发表时间：
2010-09-10
影响因子：
8.6
通讯作者：
Gambardella, P.
中科院分区：
文献类型：
--
作者：
Mugarza, A.;Lorente, N.;Gambardella, P.
我们研究了沉积在表面上的非手性分子的手性诱导和传播的电子机制。结合扫描隧道显微镜和从头算电子结构计算，铜酞菁吸附在Ag（100）揭示了手性分子轨道的形成，在结构不失真的分子。这种效应表明，由于分子和底物之间的不对称电荷转移，手性只能在电子水平上表现出来。单分子手性与吸引的货车德瓦尔斯相互作用相关，导致手性在超分子水平上的传播。Ostwald熟化为对称性破缺和自组装提供了一条有效途径。
We study the electronic mechanisms underlying the induction and propagation of chirality in achiral molecules deposited on surfaces. Combined scanning tunneling microscopy and ab initio electronic structure calculations of Cu-phthalocyanines adsorbed on Ag(100) reveal the formation of chiral molecular orbitals in structurally undistorted molecules. This effect shows that chirality can be manifest exclusively at the electronic level due to asymmetric charge transfer between molecules and substrate. Single molecule chirality correlates with attractive van der Waals interactions, leading to the propagation of chirality at the supramolecular level. Ostwald ripening provides an efficient pathway for complete symmetry breaking and self-assembly of homochiral supramolecular layers.