We report the syntheses, structures, photophysical properties, and redox characteristics of donor–acceptor-fused π-systems, namely π-extendedthiadiazoles 1–5 fused with thienopyrrole or indole moieties. They were synthesized by the Stille coupling reactions followed by the PPh3-mediated reductive cyclizations as key steps. X-Ray crystallographic studies showed that isomeric 1b and 2b form significantly
Esterlinkers enhance self-association: New fluorescent thienopyrrole-fused thiadiazoles (TPTs) with either ester or ether bridging groups were synthesized. The subtle replacement of etherlinkers by esterlinkers leads to a distinct increase (ca. 3–4 fold) in the association constant and the enthalpic contribution (ca. 3 kcal mol−1). The TPTs having esterlinkers produced 1D self-assembled clusters