TY - JOUR
T1 - Substitution effects on the excited-state intramolecular proton transfer of salicylic acid
T2 - An infrared spectroscopic study on the OH stretching vibrations of jet-cooled 5-methoxysalicylic acid
AU - El-Hakam, Eman Abd
AU - El-Nasr, Abou
AU - Fujii, Asuka
AU - Ebata, Takayuki
AU - Mikami, Naohiko
PY - 2003/7/31
Y1 - 2003/7/31
N2 - Infrared spectra of jet-cooled 5-methoxysalicylic acid in the 3-μm region were measured for both the electronic ground (S0) and first excited (S1) states. Effects of the methoxy-substitution were investigated in relation to the excited-state intramolecular proton transfer of salicylic acid. Though the electronic absorption-emission spectra exhibit the mirror-image relation, which has been regarded as evidence for the suppression of excited-state intramolecular proton transfer, the infrared spectra showed an extremely large elongation of the phenolic O-H bond upon photoexcitation. The results represent that the significant enhancement of the intramolecular hydrogen bond does occur in S1 of 5-methoxysalicylic.
AB - Infrared spectra of jet-cooled 5-methoxysalicylic acid in the 3-μm region were measured for both the electronic ground (S0) and first excited (S1) states. Effects of the methoxy-substitution were investigated in relation to the excited-state intramolecular proton transfer of salicylic acid. Though the electronic absorption-emission spectra exhibit the mirror-image relation, which has been regarded as evidence for the suppression of excited-state intramolecular proton transfer, the infrared spectra showed an extremely large elongation of the phenolic O-H bond upon photoexcitation. The results represent that the significant enhancement of the intramolecular hydrogen bond does occur in S1 of 5-methoxysalicylic.
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U2 - 10.1016/S0009-2614(03)01041-8
DO - 10.1016/S0009-2614(03)01041-8
M3 - Article
AN - SCOPUS:0141450329
SN - 0009-2614
VL - 376
SP - 788
EP - 793
JO - Chemical Physics Letters
JF - Chemical Physics Letters
IS - 5-6
ER -