Abstract Bisdialkylaminoalkylidene derivatives of dihydroindeno [2, 1-a] indene as electron- donors, and dihydroindeno-[2, 1-a] indene-5, 10-dione-biscyanoimines and bisdicyanomethylene-dihydroindeno [1, 2-b] fluorenes as acceptors have been prepared and found to form charge transfer complexes with interesting electrical conductivities.