Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Visualization and Comprehension of Electronic and Topographic Contrasts on Cooperatively Switched Diarylethene-Bridged Ditopic Ligand

Imen Hnid
ORCID logo ,
Lihao Guan
,
Elarbi Chatir
,
Saioa Cobo
ORCID logo ,
Frederic Lafolet
,
Francois Maurel
,
Jean-Christophe Lacroix
* ,
Xiaonan Sun
*
Version 1 : Received: 22 February 2022 / Approved: 24 February 2022 / Online: 24 February 2022 (13:17:29 CET)

A peer-reviewed article of this Preprint also exists.

Hnid, I.; Guan, L.; Chatir, E.; Cobo, S.; Lafolet, F.; Maurel, F.; Lacroix, J.-C.; Sun, X. Visualization and Comprehension of Electronic and Topographic Contrasts on Cooperatively Switched Diarylethene-Bridged Ditopic Ligand. Nanomaterials 2022, 12, 1318. Hnid, I.; Guan, L.; Chatir, E.; Cobo, S.; Lafolet, F.; Maurel, F.; Lacroix, J.-C.; Sun, X. Visualization and Comprehension of Electronic and Topographic Contrasts on Cooperatively Switched Diarylethene-Bridged Ditopic Ligand. Nanomaterials 2022, 12, 1318.

Abstract

Diarylethene is a prototypical molecular switch that can be reversibly photoisomerized between its open and closed forms. Ligands bpy-DAE-bpy, consisting of a phenyl-diarylethene-phenyl (DAE) central core and bipyridine (bpy) terminal substituents, are able to self-organize. They are investigated by scanning tunneling microscopy at the solid-liquid interface. Upon light irradiation, cooperative photochromic switching of the ligands is recognized down to the sub-molecular level. The closed isomers show different electron density of states (DOS) contrasts, attributed to the HOMO or LUMO molecular orbitals observed. More importantly, the LUMO images show remarkable differences between the open and closed isomers, attributed to combined topographic and electronic contrasts mainly on the DAE moieties. The electronic contrasts from multiple HOMO or LUMO distributions, combined with topographic distortion of the open or closed DAE, are interpreted by density functional theory (DFT) calculations.

Keywords

photochromic; diarylethene; bipyridine; high-resolution scanning tunneling microscopy; cooperative switches; molecular orbital; DFT calculations

Subject

Chemistry and Materials Science, Nanotechnology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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