Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, PL-87100 Toruń, Poland.
Department of Physical and Quantum Chemistry, Faculty of Chemistry, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, PL-50370 Wrocław, Poland.
J Phys Chem Lett. 2020 Aug 6;11(15):5920-5925. doi: 10.1021/acs.jpclett.0c01438. Epub 2020 Jul 13.
The optimization of nonlinear optical properties for "real-life" applications remains a key challenge for both experimental and theoretical approaches. In particular, for two-photon processes, maximizing the two-photon action cross section (TPACS), the figure of merit for two-photon bioimaging spectroscopy, requires simultaneously controlling all its components. In the present Letter, a series of difluoroborates presenting various heterocyclic rings as an electron acceptor have been synthesized and their absorption, fluorescence, photoisomerization, and two-photon absorption features have been analyzed using both experimental and theoretical approaches. Our results demonstrate that the TPACS values can be fine-tuned by changing the position of a single heteroatom, which alters the fluorescence quantum yields without changing the intrinsic two-photon absorption cross section. This approach offers a new strategy for optimizing TPACS.
“实际应用”中非线性光学性质的优化仍然是实验和理论方法的关键挑战。特别是对于双光子过程，要使双光子作用截面（TPACS）最大化，这是双光子生物成像光谱学的一个重要指标，就需要同时控制其所有组成部分。在本研究中，我们合成了一系列含有不同杂环作为电子受体的二氟硼酸盐，并通过实验和理论方法分析了它们的吸收、荧光、光致异构化和双光子吸收特性。我们的结果表明，通过改变单个杂原子的位置可以精细调整 TPACS 值，在不改变固有双光子吸收截面的情况下改变荧光量子产率。这种方法为优化 TPACS 提供了一种新的策略。
