Abstract
Structures of volatile mixed-ligand complexes of magnesium with N,N,N′,N′-tetramethylethylenediamine (tmeda) and fluorinated β-diketonate ligands L = CF3C(O)CHC(O)R– (R = t-Bu (ptac) and Ph (btfac)) are determined. Complex [Mg(tmeda)(btfac)2] is obtained for the first time and is characterized by elemental analysis and IR spectrometry. Both [Mg(tmeda)(L)2] compounds are molecular complexes, and the symmetry of their crystals is increased due to the presence of an aromatic substituent: space groups Pccn (L = btfac) and P21/n (L = ptac). The magnesium atom occurs in a distorted octahedral environment of three chelate ligands. The bond lengths and chelate angles in both complexes are similar: d(Mg–N) = 2.226(2)-2.245(1) Å, d(Mg–O) = 2.030(2)-2.043(2) Å, θ(N–Mg–N) = 80.97(7)-81.68(10)°, θ(O–Mg–O) = 85.61(9)-85.75(7)°. The Hirshfeld surfaces (CrystalExplorer, Tonto) show a presence of weak intermolecular contacts C–HPh…F in the [Mg(tmeda)(btfac)2] packing (4 contacts per molecule). The qualitative order of volatility decrease for the complexes and their hexafluoroacetylacetonate analogue [Mg(tmeda)(hfac)2] (TGA and vacuum sublimation data) corresponds to the estimated energy increase of [Mg(tmeda)(L)2] crystal lattices (CrystalExplorer, B3LYP/6-31G(d,p)): L = hfac ~ ptac >> btfac.
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The work was funded by the Russian Science Foundation (project 21-73-00252).
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Russian Text © The Author(s), 2022, published in Zhurnal Strukturnoi Khimii, 2022, Vol. 63, No. 8, 97037.https://doi.org/10.26902/JSC_id97037
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Vikulova, E.S., Sukhikh, A.S., Mikhaylova, M.A. et al. STRUCTURE AND THERMAL PROPERTIES OF VOLATILE MIXED-LIGAND MAGNESIUM COMPLEXES: EFFECT OF TERT-BUTYL AND PHENYL SUBSTITUTES IN A FLUORINATED β-DIKETONATE. J Struct Chem 63, 1323–1332 (2022). https://doi.org/10.1134/S0022476622080133
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DOI: https://doi.org/10.1134/S0022476622080133