I2 + exists in equilibrium with its dimer I4 2+ in solution.
I2 + is paramagnetic and the dimer is diamagnetic. Crystal structures of compounds containing I4 2+ have shown this ion to be planar and rectangular, with two short I–I distances (258 pm) and two longer distances (326 pm).
a. Using molecular orbitals, propose an explanation for the interaction between two I2+ units to form I42+.
b. Which form is favored at high temperature, I2+ or I42+? Why?
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