Experimental and theoretical analysis of acid responses in radicals with pyridyl groups, indicating varying basicity.
H NMR and DFT studies suggested that the 3-pyridyl and 4-pyridyl substituents act as stronger bases compared to PyBTM, whereas the basicity of the 2-methoxy-3-pyridyl is attenuated. The observed optical changes, including the emergence of new absorption bands and emission quenching, were rationalized using TD-DFT calculations.
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Hattori et al. (2026) studied this question.
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