کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
27826 | 44044 | 2009 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
NMR investigation of the dyes formed under UV irradiation of some photochromic indeno-fused naphthopyrans
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: NMR investigation of the dyes formed under UV irradiation of some photochromic indeno-fused naphthopyrans NMR investigation of the dyes formed under UV irradiation of some photochromic indeno-fused naphthopyrans](/preview/png/27826.png)
چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 208, Issues 2–3, 15 December 2009, Pages 180–185
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 208, Issues 2–3, 15 December 2009, Pages 180–185
نویسندگان
Jérôme Berthet, Paulo J. Coelho, Luis M. Carvalho, Gaston Vermeersch, Stephanie Delbaere,