| Autor: |
Belova AS; A.N. Nesmeyanov Institute of Organoelemnt Compounds of Russian Academy of Sciences, 119334 Moscow, Russian Federation., Kononevich YN; A.N. Nesmeyanov Institute of Organoelemnt Compounds of Russian Academy of Sciences, 119334 Moscow, Russian Federation., Ionov DS; Photochemistry Center, FSRC 'Crystallography and Photonics' of Russian Academy of Sciences, 119421 Moscow, Russian Federation., Sazhnikov VA; Photochemistry Center, FSRC 'Crystallography and Photonics' of Russian Academy of Sciences, 119421 Moscow, Russian Federation., Anisimov AA; A.N. Nesmeyanov Institute of Organoelemnt Compounds of Russian Academy of Sciences, 119334 Moscow, Russian Federation.; Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, 141700 Moscow Region, Russian Federation., Safonov AA; Photochemistry Center, FSRC 'Crystallography and Photonics' of Russian Academy of Sciences, 119421 Moscow, Russian Federation., Surin NM; N.S. Enikolopov Institute of Synthetic Polymeric Materials of Russian Academy of Sciences, 117393 Moscow, Russian Federation., Svidchenko EA; N.S. Enikolopov Institute of Synthetic Polymeric Materials of Russian Academy of Sciences, 117393 Moscow, Russian Federation., Fedorov YV; A.N. Nesmeyanov Institute of Organoelemnt Compounds of Russian Academy of Sciences, 119334 Moscow, Russian Federation., Shchegolikhina OI; A.N. Nesmeyanov Institute of Organoelemnt Compounds of Russian Academy of Sciences, 119334 Moscow, Russian Federation., Muzafarov AM; A.N. Nesmeyanov Institute of Organoelemnt Compounds of Russian Academy of Sciences, 119334 Moscow, Russian Federation.; N.S. Enikolopov Institute of Synthetic Polymeric Materials of Russian Academy of Sciences, 117393 Moscow, Russian Federation. |
| Abstrakt: |
A series of new tetrachromophoric systems based on stereoregular tetracyclosiloxanes and dibenzoylmethanatoboron difluoride derivatives have been synthesized and characterized by a complex of physicochemical methods. The photophysical properties of the synthesized compounds are studied by electronic absorption, steady-state, and time-resolved fluorescence spectroscopy. In the synthesized compounds, four dibenzoylmethanatoboron difluoride (DBMBF 2 )-based fluorophores are in an all-cis arrangement with respect to a cyclotetrasiloxane scaffold. DFT calculations predict that they can form H-type dimers, trimers, or tetramers with an antiparallel orientation of their ground-state dipole moments. Under UV excitation, solutions of these compounds in polar and nonpolar solvents exhibit complex fluorescence consisting of monomer- and excimer-like emissions with different lifetimes. Global fitting analysis reveals the presence of at least four kinetically distinguishable species in the excited state. The studied compounds in solutions have CIE chromaticity coordinates very close to the white color point and are promising objects for the development of next-generation single-emission materials for white illumination. |
