1960580 ESIPT excited-state intramolecular proton transfer 1320 1960584 ESIPT excited-state proton transfer 21 1960581 ESIPT excited-state intramolecular proton 3 1960583 ESIPT excited state proton transfer process 2 1960582 ESIPT excited-state-induced proton transfer 2 1960578 ESIPT each other: the rotational isomerization and intramolecular proton transfer 1 1960577 ESIPT enol(N*)-keto(T*) intramolecular proton transfer 1 1960576 ESIPT excited proton transfer 1 1960575 ESIPT excited state (phototautomer; PT) from the intramolecular proton transfer 1 1960579 ESIPT excited-state dynamics and proton transfer 1 1960585 ESIPT exhibits intramolecular excited state proton transfer 1