Physicochemical properties of quinolone antibiotics in various environments.
The progress and photosensitivity of quinolone antibiotics are briefly described. By the photolysis of nalidixic acid, the loss of -COOH group is observed. The photoreaction of fluoroquinolones involves heterolytic C-F bond fragmentation. The protonation and divalent cation complexation equilibria are also examined. The spectroscopic properties of these drugs are intensively investigated in biological mimetic systems such as AOT reverse micelle, and H(2)O-CH(3)OH and H(2)O-CH(3)CN mixed solvents. For ofloxacin and norfloxacin, the excited-state intramolecular charge transfer (ICT) is observed. So, fluorescence spectra exhibit reverse solvatochromism in mixed solvents. The change of radiative and non-radiative rate constant can also be explained using this ICT. The influence of dielectric effects of solvent is more significant compared with the specific hydrogen bonding interaction. Theoretical treatments support all of these results.
Park
Hyoung-Ryun
HR
Department of Chemistry and Institute of Basic Science, Chonnam National University, Kwangju 500-757, South Korea.
Kim
Tae Heung
TH
Bark
Ki-Min
KM
D042462:4-Quinolones; D000890:Anti-Infective Agents / Q000737:chemistry*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004777:Environment; D010777:Photochemistry
D042462:4-Quinolones; D000890:Anti-Infective Agents