Scandium(III) Benzoyltrifluoroacetonate: Structure and Thermal Properties

A. V. Sartakova; Сартакова А. В.; A. M. Makarenko; Макаренко А. М.; N. V. Kurat’eva; Куратьева Н. В.; D. P. Pishchur; Пищур Д. П.; S. V. Sysoev; Сысоев С. В.; E. S. Vikulova; Викулова Е. С.; K. V. Zherikova; Жерикова К. В.

doi:10.31857/S0044457X23600718

Scandium(III) Benzoyltrifluoroacetonate: Structure and Thermal Properties

Authors: Sartakova A.V.¹^,2, Makarenko A.M.¹, Kurat’eva N.V.¹, Pishchur D.P.¹, Sysoev S.V.¹, Vikulova E.S.¹, Zherikova K.V.¹
Affiliations:
1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences
2. Novosibirsk State University
Issue: Vol 68, No 9 (2023)
Pages: 1217-1225
Section: КООРДИНАЦИОННЫЕ СОЕДИНЕНИЯ
URL: https://journals.rcsi.science/0044-457X/article/view/136482
DOI: https://doi.org/10.31857/S0044457X23600718
EDN: https://elibrary.ru/YDKTCT
ID: 136482

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Abstract

Scandium(III) benzoyltrifluoroacetonate [Sc(btfac)3] was synthesized, purified, and characterized by elemental analysis and 1H NMR spectroscopy. Its structure was determined by single-crystal X-ray diffraction at 150 K. The complex has a molecular structure and is an axial isomer. All ligands in it are bidentate-cyclic coordinated; scandium is in a distorted octahedral environment, d(Sc–O) = 2.0681(2)–2.094(2) Å. There are two types of stacking interactions. The thermal properties in the condensed phase were studied by thermal analysis and differential scanning calorimetry (DSC). The temperature, enthalpy, and entropy of melting of the complex were determined as 399.1 ± 0.5 K,
= 36.8 ± 1.3 kJ/mol, and
= 92.2 ± 3.3 J/(K mol), respectively. The temperature-dependent saturated vapor pressure of [Sc(btfac)3] was determined in the temperature range 413–443 K by the flow (transpiration) method. The thermodynamic characteristics of vaporization at an average temperature were calculated:
= 135 ± 4 kJ/mol, and
= 212 ± 9 J/(K mol). The structure and thermal properties of scandium benzoyltrifluoroacetonate were compared to those of similar scandium tris-β-diketonate complexes

Keywords

scandium β-diketonate, synthesis, single-crystal X-ray diffraction analysis, thermal analysis, saturated vapor pressure

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