Year: 2025
Type: article
Abstract: Naphthothiophene-quinone helicenes with different molecular curvatures, i. e., NTQ, 2,3-NDTQ and 2,6-NDTQ, are synthesized in seven steps. Diels-Alder reaction between p-benzoquinone and silyl enol ether derived from the corresponding naphthothiophenes was used as a key step. Both UV-Vis and fluorescence spectroscopy, cyclic voltammetry experiments, including DFT calculation demonstrated that, in comparison to the basic thiophene-quinone system, both M-shaped (2,3-NDTQ) and S-shaped (2,6-NDTQ) structures possessed a narrower HOMO-LUMO band gap than C-shaped NTQ, implying the effect of extended conjugation. The change of molecular shape resulted in the shift in both UV-Vis and fluorescence spectra, but the strong electron withdrawing effect of benzoquinone is more dominant.
Source: Chemistry - An Asian Journal
Institution: Mahidol University
Language: English
Subfield: Organic Chemistry
Field: Chemistry
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $4,520
Funder: Mahidol University
OpenAlex ID: W4407349077