Regular Arrays of Rod-Shaped Molecular Photoswitches: Synthesis, Preparation, Characterization, and Selective Photoswitching within Mono- and Bilayer Systems

0577073 - ÚOCHB 2025 RIV DE eng J - Journal Article
Severa, Lukáš - Santos Hurtado, Carina - Rončević, Igor - Mašát, Milan - Bastien, Guillaume - Štoček, Jakub Radek - Dračínský, Martin - Houska, Václav - Kaletová, Eva - Garza, D. J. - Císařová, I. - Cimatu, K. L. A. - Bastl, Zdeněk - Kaleta, Jiří
Regular Arrays of Rod-Shaped Molecular Photoswitches: Synthesis, Preparation, Characterization, and Selective Photoswitching within Mono- and Bilayer Systems.
Chemistry - A European Journal. Roč. 30, č. 4 (2024), č. článku e202302828. ISSN 0947-6539. E-ISSN 1521-3765
R&D Projects: GA ČR(CZ) GA20-13745S; GA MŠMT(CZ) LUAUS23144
Research Infrastructure: e-INFRA CZ - 90140; CESNET II - 90042
Institutional support: RVO:61388963 ; RVO:61388955
Keywords : monolayer * photoswitch * molecular motor * Langmuir-Blodget * triptycene
OECD category: Organic chemistry
Impact factor: 4.3, year: 2022
Method of publishing: Open access
https://doi.org/10.1002/chem.202302828

We assembled photoresponsivemono-and bilayer systems with well-defined properties from rod-shaped molecules equipped with different photoswitches. Using properly chosen chromophores (diarylethene-based switch and unidirectional light-driven molecular motor), we then selectively targeted layers made of the same types of photoswitches using appropriate monochromatic light. UV–vis analysis confirmed smooth and unrestricted photoisomerization. To achieve this, we synthesized a new class of triptycene-based molecular pedestals adept at forming sturdy Langmuir–Blodgett films on a water–air interface. The films were smoothly transferred to gold and quartz surfaces. Repeated deposition afforded bilayer systems: one layer containing diarylethene-based photoswitches and the other a unidirectional light-driven molecular motor. Structural analysis of both mono-and bilayer systems revealed the molecules to be tilted with carboxylic functions pointing to the surface. At least two different polymorphs differing in monolayer thickness and tilt angle(⁓40° and ⁓60°) were identified on the gold surface.
Permanent Link: https://hdl.handle.net/11104/0346340