Question

A solution containing the IO2F2 - ion reacts slowly with excess fluoride ion to form IO2F3 2-.

a. Sketch the isomers that might be possible matching the formula IO2F3 2-.
b. Of these structures, which do you think is most likely? Why?
c. Propose a formula of a xenon compound or ion isoelectronic with IO2F3 2-.

Answer 1

a) The isomers are shown in the image attached

b) The first structure in the second image attached is possibly correct

b) The compound is shown in the image attached.

A linear configuration in which the two fluorine atoms are positioned on opposite sides of the iodine atom is one such isomer. A bent or V-shaped configuration, in which the two fluorine atoms are on the same side of the iodine atom, is an example of another isomer. These isomers can then react with excess fluoride ions to create
`IO_2F_3`²⁻ ions by substituting a fluoride ion for one of the oxygen atoms.

The resulting
`IO_2F_3`²⁻ ion is bonded to the central iodine atom by one oxygen atom and three fluorine atoms, forming a trigonal pyramidal structure. Asymmetry is introduced to the molecule by the reaction with excess fluoride ions, which can result in various isomers of the
`IO_2F_3` ion.