Unique three-dimensional (3D) molecular array in dimethyl-DNTT crystals: a new approach to 3D organic semiconductors

Two isomeric dimethyl derivatives of dinaphtho[2,3-b:2',3'-f]thieno[3,2-b] thiophene (2,9- and 3,10-DMDNTT) were synthesized and characterized. Their crystal structures were classified as unique threedimensional (3D) herringbone arrangements. Of them, 3,10-DMDNTT preserves the same packing structure in the thin-film phase, and the film acted as a superior semiconductor channel in field-effect transistors with mobility up to 0.8 cm(2) V(-1) S(-1).