A brand new series of thiophene bridged bis-naphthalimides has been obtained. These
molecules can act as semiconductors and have an even or an odd number of
thiophene rings, so that they vary their molecular dipole moments, which have some
influence in their molecular packing. With theoretical calculations, the stability of their
derivative -dimers (either parallel or antiparallel) has been elucidated. Results
indicate a face-to-face parallel molecular packing for these semiconductors, regardless
of their estimated molecular dipole moments. The results obtained are reasonable
regarding the field-effect mobilities that have been measured in a bottom-gate topcontact
transistor architecture; no direct correlation between performances and
dipolar moments is shown. Ambipolar field-effect mobilities have been recorded for
the systems of greatest length (2NDI-4T and 2NDI-5T).
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