Neither the bis nor the tetrakis-pyridyl system, but a simple monopyridyl-linked anthracenyl π-conjugate is established as a reversible protonation/deprotonation stimuli-responsive solid material with 129 nm red-shift in the fluorescence. This feature is applied to develop the fluorophore coated paper sheet to be used in security writings with an acid-pen and a base-eraser.
M. Z. Khalid Baig, B. Prusti and M. Chakravarty, J. Mater. Chem. C, 2019, 7, 3735 DOI: 10.1039/C8TC06338A
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