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RAS Chemistry & Material ScienceЖурнал неорганической химии Russian Journal of Inorganic Chemistry

  • ISSN (Print) 0044-457X
  • ISSN (Online) 3034-560X

Structural variability of rare-earth bromide complexes with acetylurea

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PII
10.31857/S0044457X24050102-1
DOI
10.31857/S0044457X24050102
Publication type
Article
Status
Published
Authors
M. S. Polukhin
  • Occupation: Faculty of Chemistry
  • Affiliation:
    Lomonosov Moscow State University
    Lebedev Physical Institute RAS
Volume/ Edition
Volume 69 / Issue number 5
Pages
727-735
Abstract
New coordination compounds of light rare-earth (RE) bromides with acetylurea (AsUr) were synthesized, [Y(AcUr)2(H2O)4]1.39[Y(AcUr)2(H2O)5]0.61Br6·2H2O (I), [La(AcUr)2(H2O)5]Br3 (II), [Ce(AcUr)2(H2O)5]Br3 (III), [Nd(AcUr)2(H2O)5]Br3 (IV), [Sm(AcUr)2(H2O)5]Br3 (V); elemental analysis, IR spectroscopy and X-ray diffraction were used to determine their compositions and structural features. Compound I is built of the [Y(AcUr)2(H2O)4]3+ and [Y(AcUr)2(H2O)5]3+ cations in the 2.28 : 1; they differ by the number of the inner-sphere water molecules (4 and 5 for coordination numbers 8 and 9, respectively), non-coordinated Br— ions and H2O molecules. Compounds II and III are built of the [Ln(AcUr)2(H2O)5]3+ (Ln = La, Ce) cations and outer-sphere Br— ions. The structures changes on cooling from 296 K to 100 K being isostructural at both temperatures. Compounds IV and V have the same composition, but different structures. They also have different polymorphous modifications at 100 and 296 K. Samarium, terbium and dysprosium bromide complexes of acetyl urea show photoluminescence.
Keywords
бромиды лантаниды амиды кристаллическая структура фотолюминесценция
Date of publication
17.09.2025
Year of publication
2025
Number of purchasers
0
Views
13

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