Studies on curcumin and curcuminoids. XXXIX. Photophysical properties of bisdemethoxycurcumin.
The steady-state absorption and fluorescence, as well as the time-resolved fluorescence properties of bisdemethoxycurcumin dissolved in several solvents differing in polarity and H-bonding capability were measured. The photodegradation quantum yield of the compound in acetonitrile and methanol was determined. The bisdemethoxycurcumin decay mechanisms from the S(1) state were discussed and compared with those of curcumin. The differences in S(1) dynamics observed between bisdemethoxy-curcumin and curcumin could be ascribed to a difference in H-bond acceptor/donor properties of the phenolic OH and a difference in strength of the intramolecular H-bond in the keto-enol moiety within the two molecules.
Nardo
Luca
L
Department of Physics and Mathematics, University of Insubria and C.N.I.S.M.-C.N.R., Via Valleggio, 11- 22100 Como, Italy. luca.nardo@uninsubria.it
Andreoni
Alessandra
A
Masson
Màr
M
Haukvik
Tone
T
Tønnesen
Hanne Hjorth
HH
D000042:Absorption; D003474:Curcumin / Q000031:analogs & derivatives* / Q000737:chemistry; D036381:Diarylheptanoids; D010782:Photolysis; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence
D036381:Diarylheptanoids; D012997:Solvents; C034786:bisdemethoxycurcumin; D003474:Curcumin