| 摘要 |
<p>A novel compound exhibiting stable photochromism, i.e., a transition metal-spirobenzothiopyran complex represented by general formula (I) and a process for producing the same, wherein R<1> represents C1 to C20 alkyl; R<2>, R<3>, R<4>, R<5>, R<6>, R<7> and R<8> represent each hydrogen, etc.; Y represents oxygen or sulfur; and M represents chromium, etc. <CHEM></p> |
