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In the polymer, uranyl (UO 2 2+) centers are bridged by acetate ligands. The remainder of each (heptacoordinate) coordination sphere is provided by an aquo ligand and a bidentate acetate ligand. One water of crystallization occupies the lattice.
Ball-and-stick model of UO 2+ 2 The uranyl ion, showing the U–O bond order of 3. The uranyl ion is an oxycation of uranium in the oxidation state +6, with the chemical formula UO 2+ 2. It has a linear structure with short U–O bonds, indicative of the presence of multiple bonds between uranium and oxygen.
Uranyl metaphosphate is a compound of uranium, phosphorus, and oxygen.It is one of the phosphates of uranium with the formula [UO 2 (PO 3) 2] n.This long-chain compound is formed via the thermal decomposition of UO 2 (H 2 PO 4) 2 ·3H 2 O. [1] Double salts, such as NaUO 2 (PO 3) 3 and CsUO 2 (PO 3) 3, are known.
The most important oxidation states of uranium are uranium(IV) and uranium(VI), and their two corresponding oxides are, respectively, uranium dioxide (UO 2) and uranium trioxide (UO 3). [2] Other uranium oxides such as uranium monoxide (UO), diuranium pentoxide (U 2 O 5), and uranium peroxide (UO 4 ·2H 2 O) also exist.
Uramphite is a rarely-found phosphate mineral in the "phosphate, arsenate and vanadate" mineral class with chemical composition (NH 4) 2 [UO 2 PO 4] 2 ·6H 2 O [2] from which it is seen to be a hydrated ammonium uranyl phosphate.
Uranyl carbonate refers to the inorganic compound with the formula UO 2 CO 3. Also known by its mineral name rutherfordine , this material consists of uranyl (UO 2 2+ ) and carbonate (CO 3 2- ). Like most uranyl salts, the compound is a polymeric, each uranium(VI) center being bonded to eight O atoms. [ 1 ]
The structure of UO 2 (SO 4)(H 2 O) 3.5 is illustrative of the uranyl sulfates. The trans-UO 2 2+ centers are encased in a pentagonal bipyramidal coordination sphere. In the pentagonal plane are five oxygen ligands derived from sulfate and aquo ligands. The compound is a coordination polymer.
Uranyl peroxide or uranium peroxide hydrate (UO 4 ·nH 2 O) is a pale-yellow, soluble peroxide of uranium.It is found to be present at one stage of the enriched uranium fuel cycle and in yellowcake prepared via the in situ leaching and resin ion exchange system.