Abstract

GATTO, Claudia C.; LANG, Ernesto S.; BURROW, Robert A.  and  ABRAM, Ulrich. Syntheses and structures of 2-acetylpyridine-(2-amino-benzoylhydrazone) and its dioxouranium(VI) complex. J. Braz. Chem. Soc. [online]. 2006, vol.17, n.8, pp. 1612-1616. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532006000800019.

We describe the synthesis and characterization of 2-acetylpyridine-(2-aminobenzoylhydrazone) (HL¹) and its first dioxouranium complex. The single crystal X-ray structural analysis of the hydrazone, HL¹, reveals an almost planar structure with intermolecular hydrogen bonds. The complex [UO₂(L¹)(dmf)₂](NO₃) is formed by refluxing a suspension of HL¹ with uranyl nitrate in methanol in the presence of a small quantity of triethylamine. Recrystallisation from dmf results in single crystals suitable for X-ray crystallography. The single crystal X-ray study of the complex shows a distorted pentagonal-bipyramidal coordination geometry around the uranium(VI) center, determined by two axial oxo ligands, two nitrogen and one oxygen atoms from a chelating monodeprotonated hydrazone and the oxygen donor atoms of two dimethylformamide molecules.

Keywords : uranium; hydrazones; actinides; structure analysis.