In [B2H7r (5.11), each B atom is approximately tetrahedral,
(a) How many valence electrons are present in the anion?
(b) Assume that each B atom is sp3 hybridized. After localization of the three terminal B—H bonds per B, what B-centred orbital remains for Lise in the bridging interaction?
(c) Following from your answer to part
(b), construct an approximate orbital diagram to show the formation of |B2H7]~ from two BH3 units and H~. What does this approach tell you about the nature of the B —H-B bridge?
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