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Abstract <p>Coordination compounds of rare-earth nitrates with <i>N</i>,<i>N</i>-dimethylacetamide (DMAA) with the compositions [Sc(H<sub>2</sub>O)(DMAA)<sub>2</sub>(NO<sub>3</sub>)(μ-OH)<sub>2</sub>Sc(NO<sub>3</sub>)(DMAA)<sub>2</sub>(H<sub>2</sub>O)](NO<sub>3</sub>)<sub>2</sub>, [La(DMAA)<sub>4</sub>(NO<sub>3</sub>)<sub>3</sub>], [Ce(DMAA)<sub>5</sub>(NO<sub>3</sub>)<sub>2</sub>][Ce(DMAA)<sub>2</sub>(NO<sub>3</sub>)<sub>4</sub>], and [Ln(DMAA)<sub>3</sub>(NO<sub>3</sub>)<sub>3</sub>] (Ln = Pr, Nd, Sm–Lu, Y) have been synthesized. Using elemental analysis, IR spectroscopy, single-crystal and powder X-ray diffraction techniques, as well as TGA-DSC analysis, their compositions and structural features were determined; thermal decomposition of the compounds was studied in a wide temperature range (50–900°C). Complexes [Ln(DMAA)<sub>3</sub>(NO<sub>3</sub>)<sub>3</sub>] form two isostructural series: crystals with Ln = Pr–Dy belong to the monoclinic symmetry, and crystals with Ln = Ho–Lu, Y belong to the orthorhombic symmetry. It is shown that the coordination compounds can be used as precursors for the production of nanoscale REE oxides (from 12 to 50 nm) with a specific surface area of 18–65 m<sup>2</sup>/g.</p>

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Coordination Compounds of Rare-Earth Nitrates with N,N-Dimethylacetamide

  • 期刊论文

  • 发表日期：

    2025年5月1日

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  • M. S. Polukhin,
  • I. A. Karavaev,
  • E. V. Savinkina,
  • G. A. Buzanov,
  • A. S. Kubasov,
  • M. S. Grigoriev,
  • E. S. Turyshev

摘要

Abstract

Coordination compounds of rare-earth nitrates with N,N-dimethylacetamide (DMAA) with the compositions [Sc(H2O)(DMAA)2(NO3)(μ-OH)2Sc(NO3)(DMAA)2(H2O)](NO3)2, [La(DMAA)4(NO3)3], [Ce(DMAA)5(NO3)2][Ce(DMAA)2(NO3)4], and [Ln(DMAA)3(NO3)3] (Ln = Pr, Nd, Sm–Lu, Y) have been synthesized. Using elemental analysis, IR spectroscopy, single-crystal and powder X-ray diffraction techniques, as well as TGA-DSC analysis, their compositions and structural features were determined; thermal decomposition of the compounds was studied in a wide temperature range (50–900°C). Complexes [Ln(DMAA)3(NO3)3] form two isostructural series: crystals with Ln = Pr–Dy belong to the monoclinic symmetry, and crystals with Ln = Ho–Lu, Y belong to the orthorhombic symmetry. It is shown that the coordination compounds can be used as precursors for the production of nanoscale REE oxides (from 12 to 50 nm) with a specific surface area of 18–65 m2/g.