One of the major reasons for studying chemical kinetics is to use measurements of the macroscopic properties of a system, HPLC of Formula: C8H6N2, such as the rate of change in the concentration of reactants or products with time.In a article, mentioned the application of 253-52-1, Name is Phthalazine, molecular formula is C8H6N2
A time-resolved EPR study of short-lived triplet states: Host and temperature dependences of triplet properties of phthalazine
The triplet properties of phthalazine are investigated by means of the time-resolved EPR technique with laser excitation in various hosts over a wide range of temperature.The host and temperature dependences are interpreted satisfactorily in terms of the vibronic mixing between the 3n?* and 3??* states.From the host dependences of the EPR parameters the zfs of the pure 3n?* state of phthalazine is deduced to be Xn = 0.027 cm-1, Yn = -0.058 cm-1, and Zn = 0.031 cm-1.The fraction of the 3n?* character of the T1 state is estimated to be ca. 0percent in ethanol, benzoic acid (BAC), and 1, 4-dichlorobenzene (DCB), 14percent in 1, 2, 4, 5- tetrachlorobenzene (TCB), 60percent in biphenyl (BP), and 84percent in durene.The temperature dependences of the zfs, linewidth, phosphorescence spectrum, and lifetime are investigated and the results are explained using a continuum model.From the simulation of the temperature dependence of the triplet lifetime in the DCB host the decay rate constant of the second excited triplet (3n?*) state is estimated to be 2.5X104 s-1.A drastic increase of the decay rate at higher temperatures suggests the presence of a higher 3n?* state with a decay rate constant of ca. 106 s-1.Possible causes for the lack of phosphorescence and fast radiationless decay are also discussed.
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Reference£º
Phthalazine – Wikipedia,
Phthalazine | C8H6N444 – PubChem