Abstract
Reactions of the samarium complex [(ArBIG-bian)2−Sm2+] (1) (ArBIG-bian is the 1,2-bis-[(2,6-dibenzhydryl-4-methylphenyl)imino]acenaphthene dianion) with iodine (0.5 mol. equiv.) or triphenyltin chloride lead to the oxidation of the metal and afford the corresponding derivatives [(ArBIG-bian)2−Sm3+I(dme)] (2) and [(ArBIG-bian)2−Sm3+Cl(dme)] (3). Meanwhile, the reaction of the related ytterbium complex [(ArBIG-bian)2−Yb2+(dme)] (4) with iodine (2:1) or copper(I) chloride resulted in the oxidation of the dianionic ligand rather than the metal to form the compounds [(ArBIG-bian)−Yb2+I(dme)] (5) and [(ArBIG-bian)−Yb2+Cl]2 (6), respectively. The reaction of 2 with one molar equivalent of potassium pentamethylcyclopentadienide gave the adduct [(ArBIG-bian)2−Sm3+(I)Cp*][K(dme)4] (7). The reaction of samarium complex 1 with 2,2′-bipyridine (bipy) (1:2) is accompanied by the oxidation of SmII to SmIII to form the derivative [(ArBIG-bian)2−Sm3+(bipy)2] (8) containing the radical-anion and neutral bipy ligands. The coordination of a neutral bipyridine molecule to the metal atom in ytterbium iodine complex 5 leads to the metal—ligand electron transfer giving [(ArBIG-bian)2−Yb3+I(bipy)] (9). All the newly synthesized compounds 2, 3, and 5–9 were characterized by IR spectroscopy (complexes 5 and 6 were also characterized by EPR spectroscopy) and elemental analysis. The molecular structures of complexes 2, 3, and 5–9 were determined by X-ray diffraction.
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Funding
The study was performed within the framework of the state assignment and was financially supported by the Russian Foundation for Basic Research (Project No. 19-03-00740) using equipment of the Joint 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 “Promotion of the Development of Material and Technical Infrastructure of Centers for Collective Use of Scientific Equipment,” Unique Identifier RF-2296.61321X0017, Agreement Number 075-15-2021-670).
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Dedicated to Academician of the Russian Academy of Sciences O. M. Nefedov on the occasion of his 90th birthday.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2119–2129, November, 2021.
This paper does not contain descriptions of studies on animals or humans.
The authors declare no competing interests.
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Sokolov, V.G., Lukina, D.A., Skatova, A.A. et al. Samarium and ytterbium complexes based on sterically hindered 1,2-bis(imino)acenaphthene*. Russ Chem Bull 70, 2119–2129 (2021). https://doi.org/10.1007/s11172-021-3323-z
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DOI: https://doi.org/10.1007/s11172-021-3323-z