Investigations into oxidation induced ring opening of terarylenes containing π-extended thieno[b]thiophene units

Four photochromic terarylenes having extended π-conjugated thieno[b]thiophene units have been prepared. Photochromic ring-cyclization and cycloreversion behaviour are exluated depending on the potision of thieno[b]thiophene units. Sponteneous fading reaction involving both...