Application In Synthesis of 4-Aminopyrimidine. The mechanism of aromatic electrophilic substitution of aromatic heterocycles is consistent with that of benzene. Compound: 4-Aminopyrimidine, is researched, Molecular C4H5N3, CAS is 591-54-8, about Controlling Two-Photon Action Cross Section by Changing a Single Heteroatom Position in Fluorescent Dyes. Author is Osmialowski, Borys; Petrusevich, Elizaveta F.; Antoniak, Magda A.; Grela, Izabela; Bin Jassar, Mohammed A.; Nyk, Marcin; Luis, Josep M.; Jedrzejewska, Beata; Zalesny, Robert; Jacquemin, Denis.
The optimization of nonlinear optical properties for “”real-life”” applications remains a key challenge for both exptl. and theor. 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 exptl. and theor. 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.
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