The [Se4]2+ ion has D4h symmetry and the Se—Se bond lengths are equal (228 pm).
(a) Is the ring in |Se4]21 planar or puckered?
(b) Look up a value of rcov for Se. What can you deduce about the Se—Se bonding?
(c) Draw a set of resonance structures for |Se4]– .
(d) Construct an MO diagram that describes the 7r-bonding in [Sc4|2+. What is the π-bond order?
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