| 摘要 |
<p>Described are novel photochromic 5-aromatic substituted naphthopyran compounds having certain substituents at the 2 position of the pyran ring. The aromatic group at 5-position of the naphthopyran is a substituted or unsubstituted aryl group or other substituted or unsubstituted aromatic group. These compounds may be represented by graphic formula (I). Also described are polymeric organic host materials that contain or that are coated with such compounds.</p> |
