Evidence of an Off-Resonant Electronic Transport Mechanism in Helicenes.
J Phys Chem Lett
; 15(32): 8343-8350, 2024 Aug 15.
Article
de En
| MEDLINE
| ID: mdl-39110695
ABSTRACT
Helical molecules have been proposed as candidates for producing spin-polarized currents, even at room conditions, due to their chiral asymmetry. However, describing their transport mechanism in single molecular junctions is not straightforward. In this work, we show the synthesis of two novel kinds of dithia[11]helicenes to study their electronic transport in break junctions among a series of three helical molecules dithia[n]helicenes, with n = 7, 9, and 11 molecular units. Our experimental measurements and clustering-based analysis demonstrate low conductance values that remain similar across different applied voltages and molecules. Additionally, we assess the length dependence of the conductance for each helicene, revealing an exponential decay characteristic of off-resonant transport. This behavior is primarily attributed to the misalignment between the energy levels of the molecule-electrodes system. The length dependence trend described above is supported by ab initio calculations, further confirming an off-resonant transport mechanism.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
J Phys Chem Lett
/
J. phys. chem. lett
/
The journal of physical chemistry letters
Année:
2024
Type de document:
Article
Pays d'affiliation:
Espagne
Pays de publication:
États-Unis d'Amérique