1-(3-methylbenzo[b]thiophen-2-yl)-2-(2-methylindol-3-yl)cycloal-kenes, novel photochromic compounds responding to InGaN blue laser

A novel kind of photochromic compounds, the derivatives of 1-(3-Methylbenzo [b]thiophen-2-yl)-2-(2-methylindol-3-yl)cyclo-alkene was successfully synth esized. The absorption bands of the closed-forms of these compounds centere d at 440 nm thus possessing the sensitivity within the wavelength range of InGaN blue laser.