The title pale yellow photochromic compound 11b in toluene, on
irradiation at 366 nm, cyclises to the thermally stable infrared active
blue–green photochrome,
8-amino-7-cyano-4,4-dicyclopropyl-3a,4-dihydro-6-hydroxy-2,3a-dimethylnaph
tho[2,1-b]furan-5,6-carbolactone, 12b which has a
λmax value of 720 nm for its broad long wavelength
absorption band.
淡黄色光致变色化合物 11b 在
甲苯中,经 366 纳米波长照射后,循环生成热稳定的红外活性蓝绿色光致变色色素 8-
氨基-7-
氰基-4,4-二环丙基-3a,4-二氢-6-羟基-2,3a-
二甲基萘并[2,1-b]
呋喃-5,6-甲内酯 12b,其宽长波长吸收带的λmax 值为 720 纳米波长。