Photo-induced proton-transfer cycle of 2-naphthol in faujasite zeolitic nanocavities.
The excited-state deprotonation and ground-state reprotonation of a 2-naphthol molecule encapsulated in the zeolitic nanocavity of NaX have been studied by measuring static and time-resolved spectra of fluorescence and reflectance. The excited molecule undergoes enol dissociation within 300 ps to form an isolated ion pair, which undergoes geminate recombination in 1200 ps or separation to produce the anionic species of 2-naphtholate on the time scale of 2500 ps. Ground-state reprotonation, controlled by the diffusion rate of a proton, is then followed in 0.8 ms with an activation energy of 13 kJ mol(-1).
Lee
Young-Shin
YS
School of Chemistry and Centre for Space-Time Molecular Dynamics, Seoul National University, NS60, Seoul, 151-742, Korea.
Yu
Hyunung
H
Kwon
Oh-Hoon
OH
Jang
Du-Jeon
DJ
D002214:Capsules / Q000737:chemistry / Q000528:radiation effects*; D005453:Fluorescence; D007700:Kinetics; D015394:Molecular Structure; D049329:Nanostructures / Q000737:chemistry / Q000528:radiation effects*; D009284:Naphthols / Q000737:chemistry / Q000528:radiation effects*; D010777:Photochemistry; D011522:Protons; D012680:Sensitivity and Specificity; D013057:Spectrum Analysis / Q000379:methods; D013499:Surface Properties; D013997:Time Factors; D017641:Zeolites / Q000737:chemistry / Q000528:radiation effects*
D002214:Capsules; D009284:Naphthols; D011522:Protons; D017641:Zeolites; C028405:2-naphthol