Can superoxide ion act as a ligand in a similar fashion as peroxide? There is a question in my chemistry book:


  Find oxidation state of platinum ion in the complex $\ce{[Pt(O2)(en)2Br]+}$.


My books says that there is peroxide, but I want to ask why it is peroxide? Can it be superoxide?

My answer was that oxidation state of platinum is $+3$, but the answer in the book given is $+4$ with explanation that $\ce{O2}$ here is peroxide. How can I get to know from the formula that $\ce{O2}$ is peroxide and not superoxide?
Here the oxygen "molecule" in its complex with hemoglobin is rendered as a superoxide ligand.  But remember, electrons are shared between the metal and the ligand; so there may be some latitude in how you can apportion them to determine "oxidation states".