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Biuret complexes of lanthanum bromide and gadolinium iodide

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Abstract

We present the synthesis of new biuret complexes NH2CONHCONH2 (BU), PrBr3·2BU·4H2O (I) and HoBr3·2BU·4H2O (II), and the results of X-ray diffraction analysis. In the crystals of I and II we find complex cations [Ln(H2O)4(BU)4]3+ (Ln = La, Gd) and uncoordinated halogenide ions existing in the external sphere. Biuret molecules serve as bidentate ligands (through the oxygen atoms) and are transformed from the original trans- to cis-configuration. The coordination polyhedron is a distorted square antiprism. These compounds have one or two non-coordinated molecules of water and one non-coordinated BU molecule (II) existing in the external sphere, which are joined with the halogenide ions by hydrogen bonds.

About the Authors

L. Yu. Alikberova
M.V. Lomonosov Moscow State University of Fine Chemical Technologies, 86, Vernadskogo pr., Moscow 119571
Russian Federation


T. A. Antonenko
M.V. Lomonosov Moscow State University, Moscow, 119991
Russian Federation
Chemistry faculty


D. V. Albov
M.V. Lomonosov Moscow State University, Moscow, 119991
Russian Federation
Chemistry faculty


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For citation:


Alikberova L.Yu., Antonenko T.A., Albov D.V. Biuret complexes of lanthanum bromide and gadolinium iodide. Fine Chemical Technologies. 2015;10(1):66-71. (In Russ.)

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