Photochromic hybrid sol–gel films containing naphthopyrans
Source abstract
Abstract
Several photochromic benzo- and naphthopyrans were embedded in hybrid organic–inorganic ureasilicate based films obtained by a sol–gel process. The resulting films, containing 0.1% (w/w) of the photochromic compound, were transparent and flexible and for naphthopyrans they were colourless or presented just a slight colouration. Under UV continuous irradiation the films developed a significant absorption in the visible region that fades in the dark with variable kinetics depending on the naphthopyran structure. 2,2-Diphenyl-3H-naphtho[2,1-b]pyran films showed a very fast colouration under UV light giving rise to coloured open forms, containing mainly the TC isomer (98%) along with a very small amount of the more stable TT isomer (2%), that practically returned to the initial absorbance in 1 min.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Photochromic and Fluorescence Chemistry · Porphyrin and Phthalocyanine Chemistry · Synthesis of Organic Compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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