The Journal of Organic Chemistry 2020, 85 Synthesis of Racemic, Diastereopure, and Enantiopure Carba- or Oxa-, -, -, and -helicene (Di)thiol Derivatives. Jindřich Nejedlý, Michal Šámal, Jiří Rybáček, Isabel Gay Sánchez, Václav Houska, Tomáš Warzecha, Jaroslav Vacek, Ladislav Sieger, Miloš Buděšínský, Lucie Bednárová, Pavel Fiedler, Ivana Císařová, Ivo Starý, Irena G.Helically Chiral Aromatics: The Synthesis of Helicenes by Cycloisomerization of π-Electron Systems. Journal of Chemical Theory and Computation 2020, 16 Influence of Electronic Structure Modeling and Junction Structure on First-Principles Chiral Induced Spin Selectivity. Martin Sebastian Zöllner, Aida Saghatchi, Vladimiro Mujica, Carmen Herrmann.This article is cited by 21 publications. In this case, we identify a weaker linear electromechanical response, which underpins the importance of the helical scaffold on the observed piezoelectric response.
In addition, we also performed the same spectroscopic measurements on a more rigid o-carborane dithiol molecule on the Ag(111) surface. We attribute this effect to coupling of a soft vibrational mode of the molecular helix with a vertical electric dipole induced by molecule–substrate charge transfer. We demonstrate that this effect is caused by the bias-induced deformation of the spring-like scaffold of the helical polyaromatic molecules. The force–distance spectroscopy acquired over a wide range of bias voltages reveals a linear shift of the tip–sample distance at which the contact between the molecule and tip apex is established. In this work, we demonstrate the converse piezoelectric effect in single heptahelicene-derived molecules on the Ag(111) surface using atomic force microscopy (AFM) and total energy density functional theory (DFT) calculations. The converse piezoelectric effect is a phenomenon in which mechanical strain is generated in a material due to an applied electrical field.
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