Photochromic molecules attract much attention because of their potential application to optoelectronic devices, such as optical memory media, photooptical switching and display. Here we have synthesized novel compounds dithia-dithienylethenophane derivatives and investigated photochromic performance in solution. Our main intention is restricted the rotation and fixation in a suitable position of dithia-dithienyl-ethenophane by using bridge chain and benzene ring for enhancement the photocyclization quantum yield. Dithia-dithienylethenophane is the first example of a dithienylethene bridged...