A novel family of azobenzene-based photochromic amorphous molecular materials has been created. They were found to readily form amorphous glasses with well-defined glass- transition temperatures and to exhibit photochromism as amorphous films as well as in solution. It was found that their quantum yields of trans–cis photoisomerization were smaller as amorphous films than in solution and that the backward cis–trans thermal isomerization ...
