Abstract
A calix[4]arene-based biradical with two tert-butyl nitroxide radicals and a monoradical derived from the biradical have been studied by continuous-wave electron spin resonance (CW-ESR) and pulse-ESR-based hyperfine sublevel correlation (HYSCORE) spectroscopy. The two nitroxide radical sites antiferromagnetically interact with each other, generating a thermally accessible triplet state located 4 cm−1 above the singlet ground state. The present fine-structure and hyperfine spectral simulation for the spin Hamiltonian parameters of the biradical is sensitive to the local molecular structure at the spin-bearing site, illustrating a salient electronic structure of the radical sites with the π-orbitals on the nitrogen (and oxygen) atoms cross-facing each other. The derived structure contrasts with the molecular structure determined by an X-ray crystal analysis for the hydroxylamine precursor of the biradical. The distance between the two midpoints of the nitrogen–oxygen bonds at the radical sites is by 0.234 nm longer than the one (=0.314 nm) of the two hydroxyl groups of the precursor determined by the X-ray analysis. The lack of intramolecular hydrogen bonds between the nitrogen and hydrogen of the hydroxyl groups, caused by the oxidation of the hydroxyamino precursor, gives rise to such a sizable increase in the distance between the radical sites. The HYSCORE experiments gave a direct evidence of the local molecular structure of the radical site of the partially oxidized monoradical. The experimentally derived molecular structures of both the bi-, monoradicals and the precursor are in good agreement with those obtained by density functional theory calculations.
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Notes
When the distance r is calculated in units of nm, the proportional factor μ 0 β 2/4π is equal to 4.3297 × 10−4 in units of cm−1
Other paramagnetic calix[4]arenes with two nitroxide sites in the upper rim (ref 4) give similar ESR spectral patterns in the allowed and forbidden transition regions, indicating that the biradical has a similar molecular structure in the frozen solution matrix
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Acknowledgments
This work has been partially supported by a Grant-in-Aid for Encouragement of Young Scientists, Scientific Research (B) and Grants-in-Aid for Scientific Research on Priority Areas “Molecular Magnetism”, “Delocalized Electronic Systems”, “Development of Molecular Conductors and Magnets”, and “Application of Molecular Spins” from the Ministry of Education, Culture, Sports, Science and Technology, Japan. This work has been supported by Scientific Research on Innovative Areas, “Quantum Cybernetics” from the Ministry of Education, Sports, Culture, Science and Technology, Japan. The support for the present work by Japan Science and Technology Agency through CREST project, “Implementation of Molecular Spin Quantum Computers” and by the FIRST project on “Quantum Information Processing”, JSPS (the Japan Society for the Promotion of Science) is also acknowledged. One of the authors (T.S.) acknowledges Research Fellowships of JSPS for Young Scientists.
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Sawai, T., Sato, K., Shiomi, D. et al. Intramolecular Hydrogen Bonding in Calix[4]arene-Based Nitroxide Monoradical and Biradical as Studied by CW-ESR and Pulse-ESR HYSCORE Spectroscopy. Appl Magn Reson 41, 337–352 (2011). https://doi.org/10.1007/s00723-011-0269-6
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DOI: https://doi.org/10.1007/s00723-011-0269-6