Polyhedron
Polyhedron
4 years ago

Structural studies of a series of uranyl alkylacetamides and piracetam complexes obtained in nitric acid aqueous solution

Structural studies of a series of uranyl alkylacetamides and piracetam complexes obtained in nitric acid aqueous solution
Three uranyl amide complexes have been isolated from slow evaporation technique from an aqueous solution of nitric acid (0.5M), in the presence of N′,N-diethylacetamide (noted dam; compound 1), N-ethylacetamide (noted eam; compound 2) and 2-(2-oxopyrrolidino)acetamide (or piracetam, noted pam; compound 3). It results in the formation of crystalline molecular assemblies of UO2(L)2(NO3)2 neutral moieties (L=amide ligand), in which the uranyl center is coordinated to two chelating nitrate groups either in cis positions (1) or trans positions (2 and 3) and two organic ligands, through the amide functionality. The corresponding coordination geometry for uranyl is a hexagonal bipyramid, with the two typical trans UO bondings. Single-crystal X-ray diffraction analysis revealed the bond lengths of UOamide are found to be for 2.362(3), 2.363(3) and 2.374(2)Å for 1, 2 and 3, respectively. The three complexes have been further characterized by infrared spectroscopy and their thermal behavior has been evaluated by thermogravimetry.

Publisher URL: www.sciencedirect.com/science

DOI: S0277538717305831

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