Synthesis of IR-sensitive photoswitchable molecules: photochromic 9?- styrylquinolinedihydroindolizines
作者:Saleh A. Ahmed、Thomas Hartmann、Volker Huch、Heinz D�rr、Aboel-Magd A. Abdel-Wahab
DOI:10.1002/1099-1395(200009)13:9<539::aid-poc296>3.0.co;2-9
日期:2000.9
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 DI-II 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. Copyright (C) 2000 John Wiley & Sons, Ltd.