288-16-4, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.288-16-4, Name is Isothiazole, molecular formula is C3H3NS. In a Article, authors is Schalk£¬once mentioned of 288-16-4
Time-Resolved Photoelectron Studies of Thiophene and 2,5-Dimethylthiophene
The photoinduced dynamics of thiophene and 2,5-dimethylthiophene (2,5-DMT) were investigated upon excitation at 200 and 255 nm (2,5-DMT only) using time-resolved photoelectron spectroscopy and compared with results from ab initio coupled cluster calculations. For thiophene, depopulation of the initially excited B2(pi3pi4?) state to the lower-lying A1(pi2pi4?) state occurs within 25 ¡À 20 fs, with a subsequent bifurcation into a ring-puckering channel and a ring-opening channel with lifetimes of 80 ¡À 20 and 450 ¡À 50 fs, respectively. For 2,5-DMT, the dynamics following excitation at 200 nm is described by a monoexponential decay with a time constant of 120 ¡À 20 fs, while that following excitation at 255 nm is best fit by a biexponential decay with time constants of 115 ¡À 20 fs and 15 ¡À 3 ps, respectively. The fast signal observed after excitation of 2,5-DMT is assigned to the ring-opening channel, which is favored with respect to thiophene due to a lower excited-state barrier along the ring-opening coordinate and an increased inertia toward the ring-puckering channel. Coupled cluster calculations have been undertaken to compare the relaxation dynamics of thiophene to thiazole and isothiazole. For the latter two molecules, we find a strong gradient along the ring-opening coordinate in the Franck-Condon region of the initially populated pipi? state and predict that ring-opening is the dominating relaxation channel after photoexcitation. We use the extracted information for a comparison of the thiophene dynamics with the light-induced processes observed in other five-membered heterocyclic molecules.
A reaction mechanism is the microscopic path by which reactants are transformed into products. Each step is an elementary reaction. In my other articles, you can also check out more blogs about 288-16-4
Reference£º
Isothiazole – Wikipedia,
Isothiazole – ScienceDirect.com