D. Khristolyubov, D. M. Lyubov, T. V. Makhrova
May 1, 2021
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Journal
Russian Chemical Bulletin
Abstract
2,2-Bis[2-(dimethylamino)-5-methylphenyl]acetic acid, Ar2CHCOOH (1) (Ar = 5-Me-2-Me2NC6H3), was synthesized by the carboxylation of s[2-(dimethylamino)-5-methylphenyl]-methyllithium, [Ar2CH]Li(TMEDA), with gaseous CO2. The reaction of 1 with the cationic bis(alkyl) complex [(Me3SiCH2)2Dy(THF)n][BPh4] (2: 1 molar ratio) unexpectedly afforded the tetracarboxylate complex [Dy(O2CCHAr2)4(Et2NH2)2][BPh4] (3), whereas the trinuclear oxo cluster [Dy3O(O2CHAr2)6(THF)4][BPh4] (4) was prepared from [(o-Me2NC6H4CH2)2-Dy(THF)n][BPh4]. In complex 4, three Dy3+ cations are linked by the μ3-oxo oxygen atom and six bridging μ2-κ1-O:κ1-O’-carboxylate ligands. According to the X-ray diffraction data, NMe2 groups of the diphenylmethanide moiety are not coordinated to Dy3+ cations in complexes 3 and 4.