Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 19, Issue 26, Pages 17263-17269Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7cp02088k
Keywords
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Funding
- German Research Foundation [SFB 902]
- DFG [WA 1850/4-2]
- International Max Planck Research School (IMPRS) of the MPI of Biophysics in Frankfurt
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Azobenzene compounds are known as versatile examples for photoswitchable systems because of their isomeric cis-and trans-configurations. The switching between these isomers can be reversibly controlled by light excitation. In this study we characterize two members of this class by joining the azobenzene moiety with each two paramagnetic nitroxide spin labels. Two different linkers were chosen to tune the molecular properties. The combined approach using optical and EPR spectroscopy proved the reversibility of photoexcitation and high fatigue resistance. Furthermore, depending on the nature of the linker, PELDOR distance measurements monitored clearly the photo-induced structural changes of the azobenzene unit. Thus, a powerful concept is presented resulting from the combination of these two complementary spectroscopic techniques.
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