Abstract
A new series of protected isoindigo (ID) based solution processable donor-acceptor type of small molecules was synthesized. Tert-butoxycarbonyl (t-Boc) substituted isoindigo is used as the acceptor unit and oligothiophene derivatives as the donor units. Thermal decarboxylation of small molecules films at 200 °C eliminated the t-Boc side groups. The cleavage of the protecting group formed a variety of N–H …. .O=C hydrogen bonding across the lactam structures of the isoindigo. The molecular orientation during the thermal decarboxylation of ID-Boc to ID-H was examined using X-ray diffraction and atomic force microscopy. The H-bonding formation and its impact on the optical, thermal, electrochemical and ambipolar behavior were investigated.
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