Turn-off mode fluorescent norbornadiene-based photoswitches
Artikel i vetenskaplig tidskrift, 2018

Single-molecule fluorescence emission of certain positive photochromic systems such as diarylethenes have been exploited for biological imaging and optical memory storage applications. However, there is a lack of understanding if negative photochromic systems can be used for such type of applications. Hence, to explore the potential of negative photochromic molecules for possible optical memory storage applications, we have here synthesized and studied a series of four norbornadiene-quadricyclane (NBD-QC) photoswitching molecules. These molecules feature either linearly conjugated or cross-conjugated pi-electron systems. Upon photoisomerization, the UV-vis absorption spectra of the molecules revealed a strong blue shift in the QC-form, with a photoisomerization quantum yield close to 80% for the cross-conjugated systems. In contrast, a strong intrinsic emission (up to Φf= 49%) for the linearly conjugated compounds in the NBD form was observed. Upon light-induced isomerization, the emission was completely turned off in the QC-form in all the compounds studied. Further, the robustness of the system was evaluated by performing several switching cycles. Under nitrogen, the emission can be turned off and recovered with almost no loss of emission. We also show that the QC-form can be photochemically triggered to convert back to the NBD-form using a low energy UV light (340 nm), allowing an all optical conversion to both species. The demonstrated properties can make the NBD-QC system attractive for potential applications such as optical memory storage devices.


Behabitu Ergette Tebikachew

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Fredrik Edhborg

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Nina Kann

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Bo Albinsson

Chalmers, Kemi och kemiteknik, Kemi och biokemi

Kasper Moth-Poulsen

Chalmers, Kemi och kemiteknik, Tillämpad kemi

Physical Chemistry Chemical Physics

1463-9076 (ISSN) 1463-9084 (eISSN)

Vol. 20 36 23195-23201


Nanovetenskap och nanoteknik


Fysikalisk kemi





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