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<p>Single crystals of rare-earth sulfates of the general formula Ln<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>•8H<sub>2</sub>O (Ln = Ce—Nd, Sm—Lu, Y) were obtained by dissolution of corresponding oxides or by recrystallization of the sulfates from 20% sulfuric acid. The crystal structures were determined by X-ray diffraction. The compounds crystallize in the monoclinic unit cell (space group <i>C</i>2/<i>c</i>) with the lattice constants <i>a</i> ∼13.4–13.7 Å, <i>b</i> ∼6.6–6.9 Å, <i>c</i> ∼18.0–18.5 Å, and β ∼102.1–103.1°. The crystal structures are based on electroneutral heteropolyhedral layers <sub>∞</sub><sup>2</sup>{Ln<sub>2</sub>(H<sub>2</sub>O)<sub>8</sub>(SO<sub>4</sub>)<sub>3</sub>} formed by isolated Lnφ<sub>8</sub> polyhedra (φ = O<sup>2−</sup>, H<sub>2</sub>O<sup>0</sup>) connected by (SO<sub>4</sub>) tetrahedra through common oxygen vertices. Adjacent heteropolyhedral layers are parallel to the (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(10\bar{1}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mn>10</mn> <mrow> <mover> <mn>1</mn> <mo stretchy="false">¯</mo> </mover> </mrow> </math></EquationSource> </InlineEquation>) plane, being held together by a complex system of hydrogen bonds. The known simple rare-earth sulfates of the general formula Ln<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub>•<i>n</i>H<sub>2</sub>O include mono- (<i>n</i> = 1), tri- (<i>n</i> = 3), tetra- (<i>n</i> = 4), penta- (<i>n</i> = 5), octa- (<i>n</i> = 8), and nonahydrates (<i>n</i> = 9). Comparative crystallochemical and topological analyses of these compounds were also performed.</p>

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Crystal chemistry and topology of simple rare-earth sulfates: synthesis, crystal structures, and spectroscopy of compounds with the general formula Ln2(SO4)3•8H2O

  • 期刊论文

  • 发表日期：

    2026年1月1日

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  • Yu. A. Vaitieva,
  • D. O. Charkin,
  • E. Yu. Borovikova,
  • D. V. Deyneko,
  • A. N. Gosteva,
  • S. A. Ivanov,
  • S. N. Volkov,
  • R. K. Rastsvetaeva,
  • V. A. Blatov,
  • S. M. Aksenov

摘要

Single crystals of rare-earth sulfates of the general formula Ln2(SO4)3•8H2O (Ln = Ce—Nd, Sm—Lu, Y) were obtained by dissolution of corresponding oxides or by recrystallization of the sulfates from 20% sulfuric acid. The crystal structures were determined by X-ray diffraction. The compounds crystallize in the monoclinic unit cell (space group C2/c) with the lattice constants a ∼13.4–13.7 Å, b ∼6.6–6.9 Å, c ∼18.0–18.5 Å, and β ∼102.1–103.1°. The crystal structures are based on electroneutral heteropolyhedral layers ∞2{Ln2(H2O)8(SO4)3} formed by isolated Lnφ8 polyhedra (φ = O2−, H2O0) connected by (SO4) tetrahedra through common oxygen vertices. Adjacent heteropolyhedral layers are parallel to the ( \(10\bar{1}\) 10 1 ¯ ) plane, being held together by a complex system of hydrogen bonds. The known simple rare-earth sulfates of the general formula Ln2(SO4)3•nH2O include mono- (n = 1), tri- (n = 3), tetra- (n = 4), penta- (n = 5), octa- (n = 8), and nonahydrates (n = 9). Comparative crystallochemical and topological analyses of these compounds were also performed.