Electrochemical test of flexibility of pyridine terminated molecular rods

0557507 - ÚOCHB 2023 RIV GB eng J - Journal Article
Bastien, Guillaume - Nováková Lachmanová, Š. - Tarábek, Ján - Rončević, Igor - Hromadová, M. - Kaleta, Jiří - Pospíšil, Lubomír
Electrochemical test of flexibility of pyridine terminated molecular rods.
Electrochimica acta. Roč. 419, July (2022), č. článku 140377. ISSN 0013-4686. E-ISSN 1873-3859
R&D Projects: GA ČR(CZ) GA20-13745S; GA ČR(CZ) GX20-03691X
Research Infrastructure: CESNET II - 90042; e-INFRA CZ - 90140
Institutional support: RVO:61388963
Keywords : electron transfer * molecular rods * redox mechanism * electronic communication * single and branched bridges
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 6.6, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.electacta.2022.140377

A family of seven symmetrical molecular rods, which are sharing 4-ethynylpyridyl terminal groups and differ in the structure of the linker have been investigated. Although structurally related they show unique electrochemical behavior, which clearly correlates with their conformational flexibility. Two flexible compounds are reduced by two electrons. Their reduction yields intensive charge transfer UV-vis absorption bands and is accompanied by characteristic EPR spectra. In contrast, all conformationally rigid structures are reduced by four electrons and do not yield neither charge transfer bands nor distinct EPR signals. Simple irreversible voltammetry of all derivatives is similar to the reduction of 4-ethynylpyridine at2.1 V. The experimental observations were supported by the extensive DFT calculations. Electrochemical techniques proved to be valuable in distinction between molecular rigidity and flexibility.
Permanent Link: http://hdl.handle.net/11104/0331473