Abstract New photochromic 3-thienyl-3H-naphtho[1,2-b]pyrans fused to lactone and indole rings were efficiently prepared using a one-pot acid-catalyzed reaction, at room temperature, as the key step. These colorless photoswitches acquire intense red/brown shades under UV light and return spontaneously to the colorless state in the dark. The combination of the 3 heterocyclic rings assures a broad and intense absorption in the visible region and it allows a full switch between the two states in less than 1 min, at room temperature.
摘要
以室温下的单锅酸催化反应为关键步骤,高效地制备了与内酯和吲哚环融合的新型光致变色 3-噻吩基-3H-萘并[1,2-b]吡喃。这些无色光开关在紫外光下会呈现强烈的红色/棕色,在黑暗中会自发恢复到无色状态。3 个杂环的组合确保了它们在可见光区域具有广泛而强烈的吸收,并能在室温下不到 1 分钟的时间内实现两种状态的完全切换。