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    3. A question about sigma donors and pi acceptors
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    Shaun Malloy
    Mar 15, 2017
      ·  Edited: Mar 15, 2017

    A question about sigma donors and pi acceptors

    Why does NH3 only act as a sigma donor, but Ph3 can act as a pi acceptor?

    50 comments
    p.brown.3
    Mar 15, 2017

    Perhaps the empty d-orbitals on P has a similar energy (effective orbital overlap) with the metal d-orbitals and so can accept electron density, whereas N with a lower nuclear attraction and highly energetic 3d orbitals cannot achieve effective orbital overlap to accept electron density.

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