Researchers have conducted various experiments to observe ESIPT in chromophores containing hydroxyl and imino groups. They often use advanced spectroscopic techniques like femtosecond transient absorption spectroscopy or two-photon excitation spectroscopy. These experiments have shown clear evidence of proton transfer upon two-photon excitation, supporting the existence of ESIPT.
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4-(4-N,N-diethylcinnamenyl)aminylbenzene
(S)-4-methyl-4-phenyltetrahydro-2H-pyran-2-one
phenyl (2-O-acetyl-3,4,6,-tri-O-benzyl-α-D-mannopyranosyl-(1->3)-2,4,6-tri-O-acetyl-1-thio-α-D-mannopyranoside)
2,6-Heptadienoic acid, 3-methyl-, methyl ester, (E)-
