page_title: Oxohalide
section_title: Transition metals and actinides
hierarchical_section_title: Oxohalide / Transition metals and actinides
caption_attribution_description: English: [AgOTeF5−(C6H5CH3)2]2 molecule. Colors: black - C, green - F, red - O, brown - Te. &#32;(1985).&#32;"Preparation and characterization of silver(I) teflate complexes: bridging OTeF5 groups in the solid state and in solution". Inorg. Chem.&#32;24&#32;(25): 4307–4311.
context_page_description: Molecular oxohalides are a group of chemical compounds in which both oxygen and halogen atoms are attached to another chemical element A in a single molecule. They have the general formula AOₘXₙ, X = F, Cl, Br, I. The element A may be a main group element, a transition element or an actinide. The term oxohalide, or oxyhalide, may also refer to minerals and other crystalline substances with the same overall chemical formula, but having an ionic structure.
context_section_description: A selection of known oxohalides of transition metals is shown below, and more detailed lists are available in the literature. X indicates various halides, most often F and Cl.
  High oxidation states of the metal are dictated by the fact that oxygen is a strong oxidizing agent, as is fluorine. Bromine and iodine are relatively weak oxidizing agents, so fewer oxobromides and oxoiodides are known. Structures for compounds with d⁰ configuration are predicted by VSEPR theory. Thus, CrO₂Cl₂ is tetrahedral, OsO₃F₂ is trigonal bipyramidal, XeOF₄ is square pyramidal and OsOF₅ is octahedral.  The d¹ complex ReOCl₄ is square pyramidal.
  The compounds [Ta₂OX₁₀]²⁻ and [M₂OCl₁₀]⁴⁻ (M = W, Ru, Os) have two MX₅ groups joined by a bridging oxygen atom. Each metal has an octahedral environment. The unusual linear M—O—M structure can be rationalized in terms of molecular orbital theory, indicating the presence of dπ — pπ bonding between the metal and oxygen atoms. Oxygen bridges are present in more complex configurations like M(cp)₂(OTeF₅)₂ (M = Ti, Zr, Hf, Mo or W; cp = η⁵−C₅H₅) or [AgOTeF₅⁻(C₆H₅CH₃)₂]₂.
  In the actinide series, uranyl compounds such as UO₂Cl₂ and [UO₂Cl₄]²⁻ are well known and contain the linear UO₂ moiety. Similar species exist for neptunium and plutonium.
caption: [AgOTeF5−(C6H5CH3)2]2 molecule. Colours: black – C, green – F, red – O, brown – Te, grey – Ag.[16] Hydrogen atoms are not shown in this picture.
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