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Mendeleev Commun., 2025 Volume 35, Issue 3, Pages 310–313 (Mi mendc6750)

Communications

η2-Acetylene SmII and SmIII complexes: mirage or reality?

H. Zakariaab, D. M. Lyubova, R. R. Aysinc, Yu. V. Nelyubinac, S. S. Bukalovc, A. A. Trifonovac

a G. A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, 603950 Nizhny Novgorod, Russian Federation
b N. I. Lobachevsky State University of Nizhny Novgorod, 603950 Nizhny Novgorod, Russian Federation
c A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 119334 Moscow, Russian Federation

Abstract: The bis(carbazolide) complex of SmII, Sm[3,6-But2-1,8-(Me3SiC≡C)2Carb]2, was synthesized by the transamination reaction of Sm[N(SiMe3)2]2(THF)2 with two molar equivalents of carbazole 3,6-But2-1,8 (Me3SiC≡C)2CarbH. A similar reaction of the less sterically demanding carbazole 3,6-But2-1,8-(PhC≡C)2CarbH is accompanied by the oxidation of SmII to SmIII and lead to the formation of bis(carbazolide) amido complex [3,6-But2-1,8-(PhC≡C)2Carb]2Sm[N(SiMe3)2]. For both Sm complexes, η2-interactions with C≡C bonds, which are unconventional for LnII and LnIII metals, were experimentally confirmed by single-crystal X-ray diffraction, IR and Raman spectroscopy along with QTAIM analysis.

Keywords: lanthanides, samarium, carbazolide ligands, η2-acetylene complexes, synthesis, structure.

Received: 24.10.2024
Accepted: 18.12.2024

Language: English

DOI: 10.71267/mencom.7667



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© Steklov Math. Inst. of RAS, 2025