A purposefully synthesized nitroxide biradical R6-p-C6H4-R6 (B1), where R6 is the 1-oxyl-2,2,6,6-tetramethyl-1,2,5,6-tetrahydropyridine group with a relatively short distance between the two radical sites, has been studied by X-band electron paramagnetic resonance (EPR) spectroscopy. Hyperfine splitting (hfs) constants on the 14N atoms, electron spin exchange integral |J|, and the distance between the two N–O fragments rNO–NO were experimentally measured. Density functional theory, DFT, calculations were performed using the ORCA 18.104.22.168 program package. The optimized geometry was compared with X-ray crystallographic data and theoretical hfs constants were compared with the respective experimental EPR values. It is concluded that the current quantum chemical approaches provide good results in calculating hfs constants as well as some other EPR parameters. It is confirmed that the intramolecular electron spin exchange in biradicals analogous to B1 is realized by the indirect mechanism rather than direct collision of the N–O· groups. It is also shown that one can calculate and predict values of |J| in other similar biradicals based on the principle of “attenuation coefficients.
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A 1-oxyl-2,2,6,6-tetramethyl-1,2,5,6-tetrahydropyridine moiety is formed roughly by two planes: N1–C2–C3–C4–C5 (by IUPAC nomenclature) or N1–C6–C5–C4–C8 (X-ray pattern, Fig. 2) plane (colored in light gray in Fig. 9a), and N1–C5–C6 (by IUPAC nomenclature) or N1–C7–C8 (X-ray pattern, Fig. 2) plane (colored in dark gray in Fig. 9).
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This work was supported in part by the RUDN University Program “5-100”. Synchrotron radiation-based single-crystal X-ray diffraction measurements were performed at the unique scientific facility Kurchatov Synchrotron Radiation Source supported by the Ministry of Education and Science of the Russian Federation (project code RFMEFI61917X0007). The study was also supported in part by Russian Foundation for Basic Research (Grant No 18-33-00866-mol-a), the Supercomputing Center of M. V. Lomonosov Moscow State University , and through the Program of Fundamental Research of the Presidium of RAS (No. 1.26П). The work was supported in part by Hungarian National Research Development and Innovation Office (OTKA FK 124331). AIK thanks Dr. A. A. Shubin (Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk) who provided us with his computer program package of EPR spectra simulation.
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Kokorin, A.I., Gromov, O.I., Dorovatovskii, P.V. et al. The Structure and Internal Dynamics of R6-p-C6H4-R6 Biradical: EPR, X-ray Crystallography and DFT Calculations. Appl Magn Reson 50, 425–439 (2019). https://doi.org/10.1007/s00723-018-1089-8