Fluorescent and Photochromic Fluorescent Compounds for Applications in Optical Nanoscopy

Abstract

Scheme 3.9. Modifications of symmetric 1,2-bis(3-thienyl)ethenes. Photochromic fluorescent 1,2-bis(3-thienyl)perfluorocyclopentenesFluorescent photochromic compounds described in the literature may be used as optical memory materials and fluorescent probes. Non-destructive readout capability is indespensible for applications in the field of recording media. The fluorescence readout method is very sensitive, and the light with low power energy destroys the recorded information to a minimal extent.Three separated wavelength for writing, reading, and erasing cycles allow to change the fluorescence intensity reversibely.Several photochromic fluorescent diarylethenes were reported in the last 14 years. [35] Fluorescence modulation achieved by changes in conjugationThe fluorescence may be quenched by the photoinduced electron transfer (PET), and several fluorescent photoswitchers based on this principle have been synthesized. The compounds 39 and 40 designed by Tsvigoulis and Lehn at the begining of the 1990s have good fluorescence modulation. [36]