title: Crystal structure of μ-peroxido-κ(4) O (1),O (2):O (1'),O (2')-bis-[(nitrato-κO)(2,2':6',2''-terpyridine-κ(3) N,N',N'')dioxidouranium(VI)].
abstract: In the title dimeric complex, [{UO2(NO3)(C15H11N3)}2O2], a peroxide ion bridges the two uran-yl(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 hexa-gonal-bipyramidal coordination geometry with two uran-yl(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 inter-actions [centroid-centroid distance = 3.659 (3) Å] between pyridyl rings of the terpy ligands in neighbouring dimers, together with inter-molecular C-H⋯O and C-H⋯π inter-actions. Weak intra-molecular C-H⋯O inter-actions are also observed.
authors.affiliation: Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawasaki
authors.affiliation: Department of Chemistry, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan ; Research Center for Materials with Integrated Properties, Toho University, Miyama, Funabashi, Chiba 274-8510, Japan.
authors.forename: Takafumi
authors.initials: T
authors.lastname: Kitazawa
keywords: 2,2′:6′,2′′-terpyridine; crystal structure; dimer; peroxide; uranium(VI) complex; uran­yl(VI) ion