Novel family of liquid crystals based on a known biheterocyclic pigment material: mesomorphic derivatives of 2,5-dihydropyrrolo [3,4-c]pyrrole-1,4-dione

The chromophoric biheterocycle 2,5-dihydropyrrolo [3,4-c] pyrrole-1,4-dione (DPPD) as a widely variable basic core structure has been introduced into liquid crystal research and the first eight calamitic examples of thermomesomorphic derivatives are presented and discussed.