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Article: Findings in molecular crystals research reported from K.P. Guo and co-researchers.
- Article from:
- Journal of Technology
- Article date:
- July 7, 2009
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According to a study from Beijing, People's Republic of China, "A class of naphthopyran derivatives (3a-10a) with electron-donating and electron-acceptor substituent is prepared by condensation of 1,2-diaryl-2-propyn-1-ol with beta-naphthol in the presence of pyridinium para-toluenesulfonate (PPTS) as catalyst."
"All compounds go ring-opening isomerization in polymethylmethacrylate (PMMA) matrix with UV light irradiation (30 watt) and the maximum absorption of ring-opening isomers is at the range of 426-556 nm," wrote K.P. Guo and colleagues.
The researchers concluded: "Ring-opening isomers are completely back to ring-closing isomers when samples are ...