A set of new 1-vinylidene-naphthofurans substituted by styryl groups were synthetized. These compounds show photochromic properties when adsorbed in silica gel, or in acidified THF solutions, developing intense colours after exposure to the UV light and returning to the uncoloured state, in the dark, in several minutes. The introduction of the styryl chain extends the conjugation of the photoproducts
合成了一组新的被
苯乙烯基取代的1-亚
乙烯基-
萘呋喃。这些化合物吸附在
硅胶或酸化的THF溶液中时显示出光致变色特性,在暴露于紫外线后几分钟内会呈现强烈的颜色,并在黑暗中恢复为无色状态。
苯乙烯基链的引入扩展了光产物的缀合,并相对于母体未取代的
萘并
呋喃红移地改变了它们的吸收。对于
苯乙烯基
萘呋喃5a,在酸化的THF溶液中,暴露于紫外线1分钟(或阳光直射)后,可获得深灰色,而在黑暗中,室温下不到10分钟即可发生脱色。