Encontrados 3 documentos, a visualizar página 1 de 1
β-Carbolines. 2. Rate Constants of Proton Transfer from Multiexponential Decays...
Dias, A.; Varela, A. P.; Miguel, M. da Graça; Becker, R. S.; Burrows, H. D.; Maçanita, A. L.The β-carbolines present a complex problem involving multiple equilibria in the excited state in hydrogen-bonding solvents including water. Three excited state species exist: neutral, cation, and zwitterion. Here we examine the multiple equilibria and excited state kinetics of harmine, using time-resolved and steady state fluorescence techniques. From an analysis of the multiexponential decays, measured at the...
.beta.-Carboline Photosensitizers. 3. Studies on Ground and Excited State Parti...
Varela, A. P.; Miguel, M. da G.; Maçanita, A. L.; Burrows, Hugh D.; Becker, Ralph S.The photophysical behavior of the P-carbolines norharmane, hmane, and harmine has been studied in waterin- oil (w/o) microemulsions in AOT/cyclohexane. With pure solvents, solubility and partitioning studies indicate that these molecules dissolve preferentially in the organic phase but that their solubility in the aqueous phase increases upon decreasing pH as a consequence of protonation. However, in w/o microe...
Comment on Excited-State Acid-Base Kinetics and Equilibria in Norharmane
Varela, A. P.; Dias, A.; Miguel, M. da Graça; Becker, Ralph S.; Maçanita, A. L.http://dx.doi.org/10.1021/j100007a065
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||