A photochromic chromene compound having an indeno(2,1-f)naphtho(1,2-b)pyran structure as its basic skeleton, an aryl group or a heteroaryl group at the 6-position carbon atom of the structure and an electron donor group having a Hammett constant σ
p
of not more than −0.1 at the 7-position carbon atom.
一种具有
吲哚并[2,1-f]
萘并[1,2-b]
苯并
吡喃结构作为其基本骨架的光致变色的色
烯化合物,其在结构的6位
碳原子处具有芳基或杂环芳基,并且在7位
碳原子处具有哈密特常数σp不大于-0.1的电子给体基团。