Temperature Dependent Fluorescence of ‘Tunable Fluorophore-Fissile Bond’ Systems Based on 1-Phenyl, 3-Aryl Δ2-Pyrazolines as a Means of Quantitating Photofission Processes
Temperature Dependent Fluorescence of ‘Tunable Fluorophore-Fissile Bond’ Systems Based on 1-Phenyl, 3-Aryl Δ2-Pyrazolines as a Means of Quantitating Photofission Processes
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DOI：
10.1246/cl.1995.123
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发表时间：
1995-02
影响因子：
1.6
通讯作者：
A. P. Silva;H. Gunaratne;K. Jayasekera;S. O'Callaghan;K. Sandanayake
中科院分区：
文献类型：
--
作者：
A. P. Silva;H. Gunaratne;K. Jayasekera;S. O'Callaghan;K. Sandanayake
1-苯基，3-芳基，5-（2 '苯乙烯基）Δ2-pyrazolines在最低激发单重态下的C(5)- n(1)键均解的活化能，根据荧光量子产率（ΦF）的温度依赖性，可以与相应的单重态能量结合，得到一个恒定值75.5 kcal mol−1作为总光裂变能。1,3-二苯基，5-（2 ' -碘苯基）Δ2-pyrazoline的对应值明显超过芳基碳-碘键的键解离能（BDE）。
The activation energy for the C(5)-N(1) bond homolysis in the lowest excited singlet state of the 1-Phenyl, 3-Aryl, 5-(2′Phenylethenyl) Δ2-pyrazolines as deduced from the temperature dependence of the fluorescence quantum yield (ΦF) can be combined with the corresponding singlet energy to give a constant value of 75.5 kcal mol−1 as the total photofission energy. The corresponding value for 1,3-Diphenyl, 5-(2′-Iodo phenyl) Δ2-pyrazoline significantly exceeds the bond dissociation energy (BDE) of the aryl carbon-iodine linkage.