Work

Odd–Even Effect in Photoreactivity and Transistor Property of Benzo[b]-benzo[4,5]thieno[2,3-d]thiophene Tethered with a Diacetylenic Group through a Spacer Chain

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide A series of benzo[ b ]-benzo[4,5]thieno[2,3- d ]thiophene (BTBT) derivatives carrying a diacetylenic unit through a hydrocarbon chain spacer of different lengths (BTBT-C n -DA-C12, n = 4–7) were synthesized and characterized. A clear trend of odd–even effect can be observed in their photophysical property in that the ones with odd carbon chain spacers undergo topochemical polymerization upon UV-irradiation, whereas those with even carbon chain spacers do not. Thin-film transistors based on aligned films of these compounds after UV-irradiation also exhibit an odd–even effect in that the ones with odd carbon chain spacers gave much higher mobility than the ones with even carbon chain spacers, presumably due to the polymerization of diacetylene chains. The results can be attributed to the different relative disposition of the neighboring diacetylenes resulting from the trans zigzag chain extended from the crystalline lattice of BTBT cores. These findings underscore the importance of chain spacers as structural leverages for modulating photoreactivity and electronic properties in organic semiconductors.

Source: Chemistry of Materials

DOI: 10.1021/acs.chemmater.5c01261

Authors: Samala Venkateswarlu, Fang-Ju Lin, Yu-Tai Tao

Institutions: National Yang Ming Chiao Tung University, Institute of Chemistry, Academia Sinica, Academia Sinica, National Ilan University

Language: English

Topic: Organic Electronics and Photovoltaics

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $4,500

Funder: National Science and Technology Council