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Synthesis of IR-sensitive photoswitchable molecules: photochromic 9′- styrylquinolinedihydroindolizines

✍ Scribed by Saleh A. Ahmed; Thomas Hartmann; Volker Huch; Heinz Dürr; Aboel-Magd A. Abdel-Wahab

Book ID: 101350543
Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 133 KB
Volume: 13
Category: Article
ISSN: 0894-3230
DOI: 10.1002/1099-1395(200009)13:9<539::aid-poc296>3.0.co;2-9

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✦ Synopsis

New mono-(5a-t, w) and biphotochromic (5u, v) 9'-styrylquinolinespirodihydroindolizines (DHIs) with IR-absorbing colored forms (4) were prepared. The conformation and configuration of these new DHIs were investigated by NMR studies and the structure was proved by x-ray analysis. The kinetics of the fast cyclizing process of betaine 4 to DHI 5 takes place in the millisecond range and were studied by flash photolysis. The absorption bands of the betaines 4 were recorded at low temperature by FT-UV/VIS/near-IR spectroscopy. Large solvent effects on the absorption maxima of betaines 4 were observed.

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