Photophysical and Photochemical Properties of Some Fluorescent Derivatives of Vitamin B1
1987 ◽
Vol 42
(5)
◽
pp. 485-489
◽
Keyword(s):
Absorption and emission spectra, depopulation kinetics of the lowest excited singlet and triplet states and acid-base equilibria of two fluorescent vitamin B, derivatives, the products I and II of the reaction of N-methylated vitamine B, with cytidine and adenosine, respectively, were investigated. Analysis of the lifetime and quantum yield data indicate that at 77 K emissions are the main processes of deactivation of the S1 and T1 states for the free ion and protonated forms. The pKa values indicate a much higher acidity in the excited singlet and triplet states than in the ground state. I and II undergo very slow photochemical reactions in solution in the presence of oxygen (Φ ~ 10-4).
1992 ◽
Vol 5
(6)
◽
pp. 355-360
◽
Keyword(s):
1982 ◽
Vol 78
(8)
◽
pp. 2411
◽
Keyword(s):
1967 ◽
Vol 47
(1)
◽
pp. 95-101
◽
Keyword(s):
1975 ◽
Vol 97
(12)
◽
pp. 3283-3291
◽
1994 ◽
Vol 77
(1)
◽
pp. 41-48
◽
1978 ◽
Vol 56
(15)
◽
pp. 1970-1984
◽