Journal
CHEMICAL COMMUNICATIONS
Volume 50, Issue 99, Pages 15748-15751Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4cc07798a
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Funding
- Foundation for Polish Science [VENTURES/2010-5/1]
- EU European Regional Development Fund
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Herein, we report that thermal Z -> E isomerisation of simple azobenzene urea derivatives is selectively and predictably controlled by anion binding. The rate of this process depends strictly on the anion concentration and its binding affinity to the Z-isomer of the azobenzene host, i.e. increased rate constants are observed for higher anion concentration as well as for more strongly bound guests. The origin of this phenomenon is attributed to the electron density transfer from the anion to the host pi-system, resulting in increased repulsion between the lone electron pairs in the N=N bond.
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