2024
DOI: 10.1002/cphc.202400150
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Reversible Photochromism of 4,4’‐Disubstituted 2,2’‐Bipyridine in the Presence of SO3

Connor J. Filbin,
Md Hasanul Haque,
Cameron K. Locke
et al.

Abstract: We report an unusual photochromic behavior of 4,4'‐disubstituted‐2,2'‐bipyridine. It was found that in the presence of a SO3 source and HCl, 2,2'‐bipyridine‐4,4'‐dibutyl ester undergoes a color change from yellow to magenta in solution with maximum absorbance at 545 nm upon irradiation with 395 nm light. The photochromism is thermally reversible in solution. Different from the known bipyridine‐based photoswitching pathways, the photo response does not involve any metal which form colored complexes or the forma… Show more

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