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Theoretical study on the photooxygenation and photorearrangement reactions of 3-hydroxyflavone

机译:3-羟基黄酮的光氧化和光重排反应的理论研究

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The photooxygenation of 3-hydroxyflavone (3HF) into O-benzoyl salicylic acid and the photorearrangement of 3HF into 3-hydroxy-3-phenyl-indane-1,2-dione have been studied using theoretical calculations. These are the main photodegradation reactions of this versatile fluorescent probe which exhibits excited state intramolecular proton transfer (ESIPT). The Gibbs free energies for the ground/excited state species were computed at the DFT/TD-DFT level of theory. The calculations on the direct photooxygenation (T1 state phototautomeric form of 3HF + 3O2) as well as on the photosensitized reaction (S0 state normal form of 3HF + 1O2) confirmed the feasibility of the reaction routes via an endoperoxide intermediate. In contrast, the alternative mechanism, via an exoperoxide intermediate proved kinetically inaccessible. In the calculation of the rearrangement reaction, the T1 state phototautomeric form was considered the reacting species (as indicated by photochemical experiments) and the free energy profile was calculated through T1 stationary points. The results suggested the occurrence of an intermediate with a 1-indanone skeleton, formed through a transition state with a relatively high free energy barrier corresponding to the folding of the pyrone ring.
机译:利用理论计算方法研究了3-羟基黄酮(3HF)光氧化为 O -苯甲酰基水杨酸和3HF的光重排为3-羟基-3-苯基-茚满-1,2-二酮。这些是这种多功能荧光探针的主要光降解反应,该荧光探针显示出激发态的分子内质子转移(ESIPT)。基态/激发态物种的吉布斯自由能是在理论的DFT / TD-DFT水平上计算的。 3HF + 3 O 1 状态光互变异构形式的计算) > 2 )以及光敏反应(S 0 状态正常形式的3HF + 1 O 2 )证实了通过内过氧化物中间体进行反应的可行性。相比之下,过氧化物过氧化物中间体通过的另一种机理在动力学上是无法达到的。在重排反应的计算中,将T 1 状态的光互变异构形式视为反应物种(如光化学实验所示),并通过T < small> 1 固定点。结果表明,存在具有1-茚满酮骨架的中间体,该中间体通过具有相对高的自由能垒的过渡态形成,其对应于吡喃酮环的折叠。

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