TY - JOUR TI - Controlling Two-Photon Action Cross Section by Changing a Single Heteroatom Position in Fluorescent Dyes AU - Ośmiałowski, Borys AU - Petrusevich, Elizaveta F. AU - Antoniak, Magda A. AU - Grela, Izabela AU - Bin Jassar, Mohammed A. AU - Nyk, Marcin AU - Luis, Josep M. AU - Jędrzejewska, Beata AU - Zaleśny, Robert AU - Jacquemin, Denis T2 - The Journal of Physical Chemistry Letters AB - 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. DA - 2020/07/13/ PY - 2020 DO - 10.1021/acs.jpclett.0c01438 DP - DOI.org (Crossref) SP - 5920 EP - 5925 J2 - J. Phys. Chem. Lett. LA - en SN - 1948-7185, 1948-7185 UR - https://pubs.acs.org/doi/10.1021/acs.jpclett.0c01438 Y2 - 2020/07/14/09:33:43 ER -