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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Kinetics of the Single-Crystal to Single-Crystal Two-Photon Photodimerization of a-trans-Cinnamic Acid to a-Truxillic Acid
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Kinetics of the Single-Crystal to Single-Crystal Two-Photon Photodimerization of a-trans-Cinnamic Acid to a-Truxillic Acid

机译：反式肉桂酸单-二晶体双光子光二聚反应动力学

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摘要

The quadratic dependence of the rate of photodimerization of a-trans-cinnamic acid induced by 532 nm pulsed laser light confirms a two-photon mechanism in the single crystals. Single crystals in well-defined orientations and circularly polarized light were used in the experiments. The reaction rate deviates from first-order kinetics, but fits the JMAK expression with a coefficient indicating a mechanism intermediate between a random distribution of product molecules in the crystal and the existence of growing nuclei. The reaction is accompanied by a large change in the monoclinic _-angle of the unit cell, corresponding to increased Jr-overlap between adjacent molecules and therefore to an increased reaction rate. The improved penetration of the light in the crystal and more homogeneous product formation are significant advantages in studies of mechanisms of chemical reactions in single crystals.
机译：532 nm脉冲激光诱导的α-反式肉桂酸光二聚化速率的二次依赖性证实了单晶中的双光子机理。实验中使用了明确定义的单晶和圆偏振光。反应速率偏离一阶动力学，但是使JMAK表达式具有一个系数，该系数指示晶体中产物分子的随机分布与存在核的机制之间的中间机制。该反应伴随着晶胞的单斜角的大变化，这对应于相邻分子之间的Jr-重叠增加，并因此增加了反应速率。在单晶体化学反应机理的研究中，改善的光在晶体中的渗透和更均匀的产物形成是显着的优势。

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