The diatomic cations Br2 + and I2 + are both known.
a. On the basis of the molecular orbital model, what would you predict for the bond orders of these ions? Would you predict these cations to have longer or shorter bonds than the corresponding neutral diatomic molecules?
b. Br2 + is red, and I2 + is bright blue. What electronic transition is most likely responsible for absorption in these ions? Which ion has the more closely spaced HOMO and LUMO?
c. I2 is violet, and I2 + is blue. On the basis of frontier orbitals (identify them), account for the difference in their colors.
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