Marignier Jean-Louis, Torche Fayçal, Le Caër Sophie, Mostafavi Mehran, Belloni Jacqueline
Laboratoire de Chimie-Physique/ELYSE, UMR 8000 CNRS/UPS, Université Paris Sud, Université Paris-Saclay , Bât. 349, F-91405 Orsay Cedex, France.
LIONS, NIMBE, CEA, CNRS, Université Paris Saclay, CEA Saclay , F-91191 Gif-sur-Yvette Cedex, France.
J Phys Chem B. 2016 Mar 10;120(9):2388-96. doi: 10.1021/acs.jpcb.5b11793. Epub 2016 Feb 18.
The ester propylene carbonate (PC) is a solvent with a high static dielectric constant where the charges generated by ionizing radiation are expected to be long-lived at room temperature. Time-resolved optical absorption spectroscopy after picosecond electron pulses reveals the formation of a UV band, within less than two nanoseconds, that is assigned to the radical anion PC(-•), arising from a fast attachment reaction of electrons onto PC. Assignment and reactivity of PC(-•) in neat solvent and solutions are discussed in relation with data obtained in solutions of PC in water under reducing or oxidizing conditions and in solutions in PC of aromatic scavengers with various reduction potentials. The fate of the electrons and the ionization yield in PC are compared with those of other solvents.
碳酸亚丙酯（PC）酯是一种具有高静态介电常数的溶剂，预计在室温下，电离辐射产生的电荷在其中具有较长的寿命。皮秒电子脉冲后的时间分辨光吸收光谱显示，在不到两纳秒的时间内形成了一个紫外波段，该波段归因于自由基阴离子PC(-•)，它是由电子与PC的快速附着反应产生的。结合在还原或氧化条件下PC在水中的溶液以及具有各种还原电位的芳香清除剂在PC中的溶液中获得的数据，讨论了PC(-•)在纯溶剂和溶液中的归属和反应性。将PC中电子的归宿和电离产率与其他溶剂的进行了比较。
