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Introduction to Femtochemistry: Excited-State Proton Transfer from Pyranine to Water Studied by Femtosecond Transient Absorption
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2020-11-04 , DOI: 10.1021/acs.jchemed.0c01056 Pascale Changenet 1 , Thomas Gustavsson 2 , Isabelle Lampre 3
Journal of Chemical Education ( IF 2.5 ) Pub Date : 2020-11-04 , DOI: 10.1021/acs.jchemed.0c01056 Pascale Changenet 1 , Thomas Gustavsson 2 , Isabelle Lampre 3
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In order to introduce students to the fascinating field of femtochemistry, we propose here a practical laboratory training course conceived for second-year master’s students in chemistry. We describe the use of a broadband femtosecond transient absorption (pump–probe) experiment for monitoring a fast light-triggered chemical reaction in solution. The experiments are performed on the pyranine photoacid, which upon photoexcitation at 390 nm undergoes a proton transfer to the solvent in about 90 ps. While this practical course involves advanced equipment and techniques, the measured transient absorption data allow easy analysis and interpretation. The transient absorption spectra at a few selected delay times can be analyzed qualitatively in terms of bleach, induced absorption, and stimulated emission. Likewise, the transient absorption signals at a few chosen wavelengths can be quantitatively analyzed and explained with simple kinetic models to determine the time constant of the proton-transfer reaction. This training aims at giving the students the opportunity to face some of the current challenges in contemporary chemistry by learning the basics of ultrafast spectroscopy.
中文翻译：
飞化学简介：飞秒瞬态吸收研究兴奋态质子从吡喃向水的转移
为了向学生介绍femtochemical的迷人领域，我们在这里提议为二年级化学硕士生设计的实用实验室培训课程。我们描述了使用宽带飞秒瞬态吸收（泵浦-探针）实验来监测溶液中快速触发的化学反应。实验是在吡喃酸光酸上进行的，其在390 nm的光激发下会在约90 ps的时间内将质子转移到溶剂中。尽管本实践课程涉及先进的设备和技术，但所测得的瞬态吸收数据仍可轻松进行分析和解释。可以根据漂白，诱导吸收和受激发射定性分析在几个选定的延迟时间处的瞬态吸收光谱。同样 可以选择简单的动力学模型定量分析和解释几个选定波长处的瞬态吸收信号，以确定质子转移反应的时间常数。该培训旨在通过学习超快光谱学的基础知识，使学生有机会面对当代化学领域的当前挑战。
更新日期：2020-12-08
中文翻译：
飞化学简介：飞秒瞬态吸收研究兴奋态质子从吡喃向水的转移
为了向学生介绍femtochemical的迷人领域，我们在这里提议为二年级化学硕士生设计的实用实验室培训课程。我们描述了使用宽带飞秒瞬态吸收（泵浦-探针）实验来监测溶液中快速触发的化学反应。实验是在吡喃酸光酸上进行的，其在390 nm的光激发下会在约90 ps的时间内将质子转移到溶剂中。尽管本实践课程涉及先进的设备和技术，但所测得的瞬态吸收数据仍可轻松进行分析和解释。可以根据漂白，诱导吸收和受激发射定性分析在几个选定的延迟时间处的瞬态吸收光谱。同样 可以选择简单的动力学模型定量分析和解释几个选定波长处的瞬态吸收信号，以确定质子转移反应的时间常数。该培训旨在通过学习超快光谱学的基础知识，使学生有机会面对当代化学领域的当前挑战。
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