title: Comparison of the absorption, emission, and resonance Raman spectra of 7-hydroxyquinoline and 8-bromo-7-hydroxyquinoline caged acetate.
abstract: To better understand the deprotection reaction of the new promising phototrigger compound BHQ-OAc (8-bromo-7-hydroxyquinoline acetate), we present a detailed comparison of the UV-vis absorption, resonance Raman, and fluorescence spectra of BHQ-OAc with its parent compound 7-hydroxyquinoline in different solvents. The steady-state absorption and resonance Raman spectra provide fundamental information about the structure, properties, and population distribution of the different prototropic forms present under the different solvent conditions examined. The species present in the excited states that emit strongly were detected by fluorescence spectra. It is shown that the ground-state tautomerization process of BHQ-OAc is disfavored compared with that of 7-HQ in aqueous solutions. The observation of the tautomeric form of BHQ-OAc in neutral aqueous solutions demonstrates the occurrence of the excited-state proton-transfer process, which would be a competing process for the deprotection reaction of BHQ-OAc in aqueous solutions.
authors: Department of Chemistry, The University of Hong Kong, Hong Kong SAR, People's Republic of China.
authors: Jiani
authors: J
authors: Ma
authors: Shun Cheung
authors: SC
authors: Cheng
authors: Huiying
authors: H
authors: An
authors: Ming-De
authors: MD
authors: Li
authors: Chensheng
authors: C
authors: Ma
authors: Adam C
authors: AC
authors: Rea
authors: Yue
authors: Y
authors: Zhu
authors: Jameil L
authors: JL
authors: Nganga
authors: Timothy M
authors: TM
authors: Dore
authors: David Lee
authors: DL
authors: Phillips
mesh_terms: D000085:Acetates / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D002627:Chemistry, Physical; D006863:Hydrogen-Ion Concentration; D006912:Hydroxyquinolines / Q000737:chemistry*; D007700:Kinetics; D015394:Molecular Structure; D056951:Photoelectron Spectroscopy; D011522:Protons; D012996:Solutions; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D013059:Spectrum Analysis, Raman; D014732:Vibration; D014867:Water / Q000737:chemistry
chemical_list: D000085:Acetates; D001965:Bromides; D006912:Hydroxyquinolines; D011522:Protons; D012996:Solutions; D012997:Solvents; D014867:Water; C547246:7-hydroxyquinoline