Imidazolium tetrachlorodioxouranate(VI), [C3N2H5+]2[UO2Cl4]2−

Abstract

The crystal and molecular structure of imidazo1ium tetrach1oro-dioxouranate{VI) has been determined by X-ray diffraction methods. The crystals, obtained by reacting imidazole and U0 2 C1 2-3H 2 0 in hydrochloric and maintained at pH = 2.5-3.0, are monoclinic,

Bis(2-methylimidazolium) tetrachlorodioxouranate(VI), 2C4H7N2+.UCl4O22−

“…The UOEC12-anion is a flattened octahedron with the oxygen atoms occupying the apices and the chlorine atoms the equatorial positions. The anion has been well characterized by other structure determinations, and the distances and angles reported here are in good agreement with those previously determined (Perry, Freyberg & Zalkin, 1980). The 2-methylimidazolium cation is a planar entity and, with the exception of the methyl group, has the same geometry and dimensions as the unsubstituted imidazolium ion (Perry, Freyberg & Zalkin, 1980).…”

“…The shortest interatomic distances to the nitrogen atoms are: N(1)--CI (2) These distances are comparable with those in imidazolium tetrachlorodioxuranate(VI) (Perry, Freyberg & Zalkin, 1980), in which weak hydrogen bonding was suggested. Introduction.…”

“…This luminescence will often display considerable vibrational structure, and the spectral details are quite dependent on the overall structure of the complex and the nature of the coordination sphere about the central uranyl ion (Brittain & Perry, 1980, 1981Perry, 1982). The luminescence properties of the title compound are significantly different from those of the unsubstituted imidazolium tetrachlorodioxouranium(VI) complex (Perry, Freyberg & Zalkin, 1980).…”

Crystallization of Uranyl Salts from Dialkylimidazolium Ionic Liquids or Their Precursors

“…The solid state compounds isolated typically consist of negatively charged uranium species (mononuclear or dinuclear) charge balanced by imidazolium cations. [8,9] Norquist et al, [10] reacted UO 2 SO 4 (propylamine) 2 with neutral imidazole which resulted in the formation of an anionic uranyl sulfate coordination polymer, [(UO 2 )(SO 4 ) 3 ] n [HIm] 2n where the protonated imidazolium cations charge balance the anion. Also a few other examples of neutral uranyl complexes crystallized with neutral imidazoles have been reported.…”

Cation–cation interaction in novel Np(V) compound with methylimidazole as a model of histidine side chain

“…In uranyl compounds, imidazole or imidazolecontaining molecules are usually protonated and function as outer sphere cations [9][10][11][12][13][14][15][16]. The authors of the work [17] succeeded in the synthesis of U(VI) compound with methylimidazole forming U-N bond.…”