- PII
- S3034549925100055-1
- DOI
- 10.7868/S3034549925100055
- Publication type
- Article
- Status
- Published
- Authors
- Volume/ Edition
- Volume 51 / Issue number 10
- Pages
- 648-657
- Abstract
- A new scandium(III) 1,1,1-trifluorohexane-2,4-dionate complex [Sc(5Htfac)] was synthesized, purified, and characterized by elemental analysis, NMR spectroscopy, and mass spectrometry. Its structure was determined at 150 K by X-ray diffraction analysis (CCDC No. 2433044). The complex has a molecular structure in which the bidentate cyclic ligands are arranged according to the α-sisomer. Shortened H...F interactions were identified in the structure. The thermal properties were studied by TGA and DSC, and the fusion temperature (309.3 ± 0.5 K), enthalpy (ΔH°(T) = 36.0 ± 1.4 kJ mol), and entropy (ΔS°(T) = 116.5 ± 4.5 J mol K) of fusion were determined. The temperature dependence of the saturated vapor pressure was measured by the flow method (343–433 K) and the static method with a membrane null manometer (410–470 K). On this basis, the thermodynamic characteristics of evaporation at average and standard temperatures were calculated (ΔH°(298.15 K) = 100.2 ± 1.3 kJ mol, ΔS°(298.15 K) = 201.8 ± 2.8 J mol K). From these data, the sublimation parameters of the complex were obtained (ΔH°(298.15 K) = 135.3 ± 1.9 kJ mol, ΔS°(298.15 K) = 315.3 ± 5.4 J mol K). The structure and thermal properties of [Sc(5Htfac)] were compared with those of two scandium(III) β-diketonates bearing methyl and tert-butyl substituents in the ligand.
- Keywords
- 1,1,1-трифторгексан-2,4-дионат скандия(III) рентгеноструктурный анализ термические свойства энтальпия и энтропия парообразования и плавления
- Date of publication
- 15.04.2025
- Year of publication
- 2025
- Number of purchasers
- 0
- Views
- 45
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