Structural variability of rare-earth bromide complexes with acetylurea

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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.

About the authors

P. V. Akulinin

MIREA — Russian Technological University

Email: savinkina@mirea.ru

Lomonosov Institute of Fine Chemical Technologies

Russian Federation, Moscow

Е. V. Savinkina

MIREA — Russian Technological University

Author for correspondence.
Email: savinkina@mirea.ru

Lomonosov Institute of Fine Chemical Technologies

Russian Federation, Moscow

М. S. Grigoriev

Frumkin Institute of Physical Chemistry and Electrochemistry RAS

Email: savinkina@mirea.ru
Russian Federation, Moscow

Yu. А. Belousov

Lomonosov Moscow State University; Lebedev Physical Institute RAS

Email: savinkina@mirea.ru

Faculty of Chemistry

Russian Federation, Moscow; Moscow

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