Lewis Acid/Base Interaction Matrix Database


Type 12 Lewis Acid/Base Complexation Chemistry
Proton Transfer or Alkylation

               [NH4]+      +     π              NH3       +    H-π
               [R3O]+      +     π              R2O:      +     R-π

Bonding:

Charge controlled ionic bonding, but... a proton transfer reaction is likely to occur rather than the formation of a complex.

Charge: A reaction always occurs, rather than forming a Lewis acid/base complex so the idea of a charge on a complex is not applicable.
Chemistry:

Onium ions generally do not often form complexes with π-HOMO Lewis bases because H+ or R+ transfer (from the onium ion to the π-HOMO Lewis base) is likely to occur.

The acetate ion can be dual classified as both as a Lobe-HOMO and π-HOMO Lewis base (the acetate ion is isoelectronic with the allyl anion). Thus, ammonium acetate can be considered to be a Type 12 complex:
     [NH4]+ [CH3COO]
(but it is probably better to consider it as a Type 11 complex.)

Congeneric Series: A reaction always occurs, rather than forming a Lewis acid/base complex so the idea of congeneric series is not applicable.
Type 12 Lewis acid/base complex (generic)


Interactions and reactions classified as:
Type 12 Lewis Acid/Base Complexation Chemistry
      1 +1 1
       +
      1 +1 1



Poster
Nucleophiles & Bases

© Mark R. Leach 1999-


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