A fluorooxoiodate or fluoroiodate is a chemical compound or ion derived from iodate, by substituting some of the

oxygen Oxygen is the chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group in the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as wel ...

fluorine Fluorine is a chemical element with the symbol F and atomic number 9. It is the lightest halogen and exists at standard conditions as a highly toxic, pale yellow diatomic gas. As the most electronegative reactive element, it is extremely reacti ...

. They have iodine in the +5

oxidation state In chemistry, the oxidation state, or oxidation number, is the hypothetical charge of an atom if all of its bonds to different atoms were fully ionic. It describes the degree of oxidation (loss of electrons) of an atom in a chemical compound. C ...

. The iodine atoms have a stereochemically active lone-pair of electrons. Many are non-centrosymmetric, and are second harmonic generators (SHG) of intense light shining through them. They are under investigation as materials for

non-linear optics Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in ''nonlinear media'', that is, media in which the polarization density P responds non-linearly to the electric field E of the light. The non-linearity is typica ...

, such as for generating ultraviolet light from visible or infrared lasers. Different ions include OF₄sup>−, O₂F₂sup>−, O₃Fsup>2−, and ₂O₅F₂sup>2−. They are distinct from the fluoride iodates which are mixed anion compounds that do not have fluorine-iodine bonds.

Properties

Fluoroiodates are transparent in visible, longer wave ultraviolet and some of the infrared electromagnetic bands. Compared to iodate, the I-O bonds are shorter, and I-F bonds are longer in fluoroiodates. The I-F bond is about 0.2 Å longer than the I-O bond. The fluorine atoms repel each other in O₂F₂sup>− and are almost opposite each other. The ∠OIF angle is close to 90° and the oxygen atoms ∠OFO are at about 102°, so they resemble an octahedral arrangement, with two adjacent positions deleted.

List

References

{{Iodates Iodine compounds Iodine oxyanions Fluorine compounds