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NMR investigation of the dyes formed under UV irradiation of some photochromic indeno-fused naphthopyrans

Paper ID Volume ID Publish Year Pages File Format Full-Text
27826 44044 2009 6 PDF Available
Title
NMR investigation of the dyes formed under UV irradiation of some photochromic indeno-fused naphthopyrans
Abstract

New p-fluoro-substituted indeno-fused 3,3-diphenyl-3H-naphtho[2,1-b]pyrans were prepared and their photochromic properties studied by UV–vis and NMR spectroscopy. At room temperature UV irradiation of compound 6, presenting the indene ring fused to the k-face of the 3H-naphtho[2,1-b]pyran gave rise to two diastereoisomeric TT open forms that possess an helical structure with the conjugated 3,3-diaryl-1,3-propdienyl chain out of the plane of the indeno-naphthalen-2(1H)-one core, which renders the thermal bleaching very difficult and thus increases the life-time and concentration of these coloured species.

Keywords
Naphthopyran; Photochromism; NMR analysis; 19F NMR
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NMR investigation of the dyes formed under UV irradiation of some photochromic indeno-fused naphthopyrans
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 208, Issues 2–3, 15 December 2009, Pages 180–185
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
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