Publication Date:
2015-04-26
Description:
In the title dimeric complex, [{UO2(NO3)(C15H11N3)}2O2], a peroxide ion bridges the two uranyl(VI) [O=U=O]2+ ions. The O—O bond length of the peroxide is 1.485 (6) Å and the mid-point of this bond is located at the inversion centre of the dimer. The U atom exhibits a distorted hexagonal–bipyramidal coordination geometry with two uranyl(VI) O atoms occupying the axial positions and one O atom of the monodentate nitrate ion, both O atoms of the peroxide ion and the three N atoms of the chelating tridentate 2,2′:6′,2′′-terpyridine (terpy) ligand in the equatorial positions. Two of the N atoms of the terpy ligand lie above and below the mean plane containing the equatorial ligand atoms and the U atom [deviations from the mean plane: maximum 0.500 (2), minimum −0.472 (2) and r.m.s. = 0.2910 Å]. The dihedral angle between the terpy ligand and the mean plane is 35.61 (7)°. The bond lengths around the U atom decrease in the order U—N 〉 U—Onitrate 〉 U—Operoxo 〉 U=O. The dimeric complexes pack in a three-dimensional network held together by weak π–π interactions [centroid–centroid distance = 3.659 (3) Å] between pyridyl rings of the terpy ligands in neighbouring dimers, together with intermolecular C—H...O and C—H...π interactions. Weak intramolecular C—H...O interactions are also observed.
Keywords:
crystal structureuranium(VI) complexdimerperoxide2,2′:6′,2′′-terpyridineuranyl(VI) ion
Electronic ISSN:
1600-5368
Topics:
Chemistry and Pharmacology
,
Geosciences
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