Synthesis and characterization of acetylurea complexes with rare-earth metal halides: Polymorphism of the praseodymium complexes

被引：5

作者：

Isbjakowa, A. S. ^{[1
]}

Grigoriev, M. S. ^{[2
]}

Golubev, D., V ^{[3
]}

Savinkina, E., V ^{[3
]}

机构：

[1] Lomonosov Moscow State Univ, Moscow, Russia

[2] Russian Acad Sci, Frumkin Inst Phys Chem & Electrochem, Moscow, Russia

[3] RTU MIREA, Lomonosov Inst Fine Chem Technol, Moscow, Russia

来源：

JOURNAL OF MOLECULAR STRUCTURE | 2020年 / 1201卷

关键词：

Rare-earth complexes; Acetylurea; X-ray diffraction; Polymorphism; DERIVATIVES; CHLORIDES;

D O I：

10.1016/j.molstruc.2019.127141

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The series of rare-earth acetylurea (AcUr) complex chlorides and bromides are completed and their structures are examined. All complexes have the same composition LnX(3).2AcUr center dot 5H(2)O (X = Cl, Br). However, structures of the compounds differ significantly. The complexes with Ln = La-Sm contain complex cations [Ln(AcUr)(2)(H2O)(5)](3+) (coordination number 9); halide ions are outer-sphere. For Ln = Ho-Lu and Y, crystals contain complex cations [Ln(AcUr)(2)(H2O)(4)](3+) (coordination number 8), uncoordinated halide ions and water molecules. High barrier of internal rotation of plane acetylurea ligands makes possible formation of various conformers. Polymorphs for praseodymium complexes were studied by X-ray diffraction at 296 and 100 K. (C) 2019 Elsevier B.V. All rights reserved.

引用

页数：7

共 20 条

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