ArticleChemistry (Weinheim an der Bergstrasse, Germany)2026
Single-Step Synthesis of Dithieno[3,2-b:2',3'-e]Pyridines and Their Acid-Dependent Optical and Photosensitising Properties.
Article in Chemistry (Weinheim an der Bergstrasse, Germany), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Dithieno[3,2-b:2',3'-e]pyridine (DTP) is a heterocycle consisting of a central pyridine ring fused with two thiophene rings and can be regarded as a thiophene-based analogue of the classic N-heterocycle acridine. Unlike acridine-based dyes, the fundamental chemistry of DTP has received relatively little attention. Here, we report the straightforward synthesis of a library of DTP molecules and an investigation of their electronic properties using UV/vis absorbance and emission spectroscopy supported by computational insights, with particular focus on the influence of protonation and methylation of the central N atom on their properties. While the absorbance of the DTPs studied was confined to ultraviolet wavelengths, protonation or N-methylation of the pyridine group led to significant visible light absorption, which was exploited for the visible light photosensitisation of oxygen.
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