Abstract

The hydrates Ln(Htba)₃ ∙ 3H₂O (Ln = Yb (I), Er (II), Ho (III); Н₂tba = 2-thiobarbituric acid), Ln(Htba)₃ ∙ 2H₂O and Ln(Htba)₃ ∙ 8H₂O were crystallized from aqueous solutions. According to single-crystal X-ray diffraction analysis data, the structure of monoclinic crystals of isostructural complexes I–III was [Ln₂(H₂O)₆(μ₂-Htba-О,O')₄(Htba-О)₂]_n. The formation of isostructural Ln(Htba) ∙ 2H₂O (Ln = La, Ce, Eu, Yb, Lu), Ln(Htba)₃ ∙ 8H₂O (Ln = Eu, Tb, Ho, Yb) and Y(Htba)₃ ∙ nH₂O (n = 2, 8) was confirmed by the comparison of X-ray diffraction patterns, and their composition was determined by elemental and thermal analyses. The stability of crystal hydrates under heating in an air atmosphere and in contact with their saturated solutions was studied.

中文翻译：

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2-硫代巴比妥酸镧系元素（III）的水合物：合成，结构和热分解

摘要

水合物LN（Htba）₃ ∙3H ₂ O（Ln为镱（我），铒（II），何（III）;Н ₂ TBA = 2-硫代巴比妥酸），LN（Htba）₃ ∙2H ₂ O和LN （Htba）₃ ∙8H ₂ O从水溶液中结晶。根据单晶X射线衍射分析数据，同构复合物的斜晶体的结构我- III是[LN ₂（H ₂ O）₆（μ ₂ -Htba-О，O'）₄（Htba-О）₂ ] _n。等结构Ln（Htba）∙2H ₂ O（Ln = La，Ce，Eu，Yb，Lu），Ln（Htba）₃ ∙8H ₂ O（Ln = Eu，Tb，Ho，Yb）和Y（Htba）的形成）₃ ∙ n H ₂ O（n = 2，8）通过X射线衍射图的比较得到证实，其组成通过元素分析和热分析确定。研究了在大气气氛中加热并与饱和溶液接触时晶体水合物的稳定性。