We have establis
hed a series of synt
hetic methods to synt
hesize alkyl-substituted fused thiop
henes withdegrees of fusion from two to seven rings. T
hese fused thiop
hene ring compounds have very good solubilityin common organic solvents, making possible t
he solution processing of t
hese compounds for electronicapplications. T
he UV absorption of t
hese fused thiop
henes is blue-shifted w
hen compared with t
heirhydrocarbon counterparts. T
he larger band gaps result in much better stability. Single-crystal X-ray resultsfor 3,6-didecanyldithieno[2,3-
d:2',3'-
d']thieno[3,2-
b:4,5-
b' ']dithiop
hene (
FT5) and 3,7-didecanylthieno[3,2-
b]thieno[2',3':4,5]thieno[2,3-
d]thiop
hene (
FT4) demonstrate that both compounds form
-stackingstructures instead of a
herringbone-type of packing motif. This more favorable
-stacked structure maylead to better material electronic properties such as mobility in devices fabricated with t
hese compounds.