Investigation of the charge transport in model single molecule junctions based on expanded bipyridinium molecular conductors

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388955%3A_____%2F19%3A00501883" target="_blank" >RIV/61388955:_____/19:00501883 - isvavai.cz</a>
Result on the web
<a href="http://hdl.handle.net/11104/0293865" target="_blank" >http://hdl.handle.net/11104/0293865</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.electacta.2019.01.132" target="_blank" >10.1016/j.electacta.2019.01.132</a>

Result language
angličtina
Original language name
Investigation of the charge transport in model single molecule junctions based on expanded bipyridinium molecular conductors
Original language description
In this work the charge transport and energetics of a photochemically addressable single molecule switch based on the expanded bipyridinium core linked to an anchoring group with a controlled torsion angle θ was investigated. Electrochemical and UV-VIS absorption spectroscopy techniques complemented by the analysis based on density functional theory (DFT) show that for selected molecules the energy and shape of the LUMO is insensitive to the value of θ but the difference in torsion angle θ leads to a sizable shift of the LUMO energy and single molecule conductance value in a metal-molecule-metal junction for these molecules as shown by the combination of experimental single molecule break junction technique and theoretical non-equilibrium Green's function (NEGF)/DFT approach. The conductance switching ratio calculated from the cos 2 θ law is in a perfect agreement with the value obtained from the NEGF approach. Our combined experimental and theoretical approach paves the way for investigating expanded bipyridinium systems with multiple photochemically addressable units potentially achieving greater conductance switching ratios.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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