Author/Authors :
Tokumura، نويسنده , , Kunihiro and Natsume، نويسنده , , Miyoko and Nakagawa، نويسنده , , Takako and Hashimoto، نويسنده , , Mamoru and Yuzawa، نويسنده , , Tetsuro and Hamaguchi، نويسنده , , Hiro-o and Itoh، نويسنده , , Michiya، نويسنده ,
Abstract :
Time-resolved infrared absorption spectra of 7-hydroxyquinoline (7-HQ) in methanol were measured to investigate the relaxation processes following S1 → S′1 proton transfer tautomerization. Deuterium and nitrogen isotope effects were observed for the transient infrared spectra of 7-HQ-14N and -15N in MeOD and MeOH. The 1644 (1628) cm−1 band in MeOH (MeOD) is ascribed to the H(D)-bonded C = O stretching of the phototautomer in the ground state (St́0). Transient absorption decay exhibits a remarkable deuterium isotope effect. It is thus demonstrated that the ground-state reverse proton transfer of S′0 is responsible for the observed transient decay.
