Abstract
A series of new paramagnetic six-coordinate gallium complexes based on 3,6-di-tert-butyl-o-benzoquinone with N-donor ligands, such as pyridine (Py), 2,2′-dipyridyl (2,2′-dipy), and 4,4′-di-tert-butyl-2,2′-dipyridyl (But-dipy), were synthesized and structurally characterized. The molecular structures of the synthesized compounds were established by single-crystal X-ray diffraction. The complexes with bidentate N-donor ligands have the cis arrangement of the o-quinone ligands, whereas the compound with coordinated pyridine molecules has the trans arrangement of the diolate moieties. The synthesized compounds are characterized by spin density delocalization between the differently charged redox-active ligands. Regardless of the metal coordination environment, the near-IR region of the electronic absorption spectra of all the synthesized complexes show a low-intensity charge-transfer band between the catecholate and o-semiquinolate ligands, which was confirmed by DFT calculations.
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Funding
The work was performed using the equipment of the Analytical Center of the G. A. Razuvaev Institute of Organometallic Chemistry of the Russian Academy of Sciences with the financial support from the Ministry of Science and Higher Education of the Russian Federation (Grant “Ensuring the Development of the Material and Technical Infrastructure of the Centers for Collective Use of Scientific Equipment,” unique identifier RF—2296.61321X0017, agreement number 075-15-2021-670) and the Joint Research Centre of Physical Methods of Research of the N. S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences (JRC PMR IGIC RAS).
This study was financially supported by the Council on Grants at the President of the Russian Federation (Program for State Support of Leading Scientific Schools of the Russian Federation, Grant NSh-403.2022.1.3).
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Dedicated to Academician of the Russian Academy of Sciences V. I. Ovcharenko on the occasion of his 70th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 7, pp. 1441–1452, July, 2022.
No human or animal subjects were used in this research.
The authors declare no competing interests.
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Maleeva, A.V., Trofimova, O.Y., Ershova, I.V. et al. Molecular and electronic structures of paramagnetic gallium complexes with differently charged o-quinone ligands. Russ Chem Bull 71, 1441–1452 (2022). https://doi.org/10.1007/s11172-022-3550-y
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DOI: https://doi.org/10.1007/s11172-022-3550-y