538343-13-4Relevant academic research and scientific papers
Optimizing the photochromic performance of naphthopyrans in a rigid host matrix using poly(dimethylsiloxane) conjugation
Ercole, Francesca,Malic, Nino,Davis, Thomas P.,Evans, Richard A.
supporting information; experimental part, p. 5612 - 5623 (2010/07/05)
A series of methoxy substituted 2,2-diaryl-2H-naphthopyran photochromic dyes were assembled incorporating hydroxy functionality to allow their subsequent attachment to flexible poly(dimethylsiloxane) oligomers. The photochromic performance of the generated PDMS-naphthopyran conjugates was studied in a thermoset host matrix and compared to non-conjugated, electronically equivalent control dyes. Both coloration and decoloration speeds were found to be greatly improved with critical T1/2 decoloration times reduced by 42-80%. The extent of solution-like performance provided by PDMS conjugation in the rigid host was examined with reference to the fade performance of control dyes in solution, and found to range from 20 to 90%. These measures are believed to be influenced by the electronic nature and steric interactions of the photochromic dyes.
Neutral coloring photochromic 2H-naphtho[1,2-b] pyrans and heterocyclic pyrans
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, (2008/06/13)
Compositions comprising a naphtho [1,2-b]pyran of formula (I): wherein R7and/or R9is hydrogen or an amino group provided that R7and R9are not both hydrogen, and the other substituents are as defined in the speci
