Week2(1).pdf - ELECTRON DEFICIENT COMPOUNDS • Three-centre two electron compounds • H3 2 valence é most simple polyatomic molecule • Structure

Week2(1).pdf - ELECTRON DEFICIENT COMPOUNDS •...

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ELECTRON DEFICIENT COMPOUNDS Three-centre, two electron compounds H 3 + : 2 valence é; most simple polyatomic molecule Structure: Nuclei are arranged triangularly with sides of ~ 1Å each Prediction of structure: Form in reaction of H + with H 2 : No ONE Lewis structure can describe bonding in this molecule - possibility exists of 3 bonds with only 2 electrons! H + + H 2 Electrophile, attacks H 2 at area of highest electron density electron density concentrated between nuclei H H H + H 3 +
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