Two-photon voltmeter for measuring a molecular electric field.
Two-photon voltmeter for measuring a molecular electric field.
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用于测量分子电场的两光子电压表。
DOI：
10.1002/anie.201502157
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发表时间：
2015-06-22
期刊：
影响因子：
--
通讯作者：
Uudsemaa M
中科院分区：
文献类型：
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作者：
Rebane A;Wicks G;Drobizhev M;Cooper T;Trummal A;Uudsemaa M
我们提出了一种新的方法来确定偶极溶质诱导的反应场的强度，沿着与地面和激发态的静电偶极矩和极化率的溶剂化发色团，使用专门的单光子和双光子吸收测量。我们验证了两个基准发色团N，N-二甲基-6-丙酰基-2-萘胺（普罗丹）和香豆素153（C153）在一系列的甲苯/二甲基亚砜（DMSO）的混合物的方法，发现实验值与文献和我们的量子化学计算显示出良好的定量协议。 我们的研究结果表明，反应场在一个令人惊讶的宽范围内变化，0-107 V cm−1，并在接近的生色团半径的顺序，溶质-溶剂系统的有效介电常数显示出独特的功能依赖于体介电常数，提供了新的见解近距离分子相互作用。
We present a new approach for determining the strength of the dipolar solute-induced reaction field, along with the ground- and excited-state electrostatic dipole moments and polarizability of a solvated chromophore, using exclusively one-photon and two-photon absorption measurements. We verify the approach on two benchmark chromophores N,N-dimethyl-6-propionyl-2-naphthylamine (prodan) and coumarin 153 (C153) in a series of toluene/dimethyl sulfoxide (DMSO) mixtures and find that the experimental values show good quantitative agreement with literature and our quantum-chemical calculations. Our results indicate that the reaction field varies in a surprisingly broad range, 0–107 V cm−1, and that at close proximity, on the order of the chromophore radius, the effective dielectric constant of the solute–solvent system displays a unique functional dependence on the bulk dielectric constant, offering new insight into the close-range molecular interaction.