ArticleChemistry (Weinheim an der Bergstrasse, Germany)2026
Dual Acid Responses of Stable Luminescent Diphenylpyridylmethyl Radicals With Additional Pyridyl Groups.
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
Polychlorinated diphenylpyridylmethyl radicals, exemplified by (3,5-dichloro-4-pyridyl)bis(2,4,6-trichlorophenyl)methyl radical (PyBTM), have garnered significant attention as stable radical emitters. Due to their halogenated pyridyl groups, these radicals also exhibit weak basicity and acid-responsive properties. To further explore and expand the acid-responsive behavior of PyBTM, we substituted additional pyridyl groups (3-pyridyl, 4-pyridyl, and 2-methoxy-3-pyridyl) for chlorine atoms at the para-positions relative to the methyl radical center. This modification yielded six novel, stable luminescent radicals. Spectroscopic analysis revealed distinct changes in absorption and emission profiles upon titration with a Brønsted acid (p-toluenesulfonic acid), a Lewis acid (tris(pentafluorophenyl)borane), and metal cations (Ag
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