Lewis Acid/Base Interaction Matrix Database


Type 6 Lewis Acid/Base Complexation Chemistry
Ionic Salts

               Li+      +     [BH4]        LiBH4
               Na+      +    [AlH4]       NaAlH4

Bonding: Type 6 complexes are, in Pearson-Klopman HSAB terms, classic hard/hard complexes which give rise to charge-controlled ionic salts.
Charge: The charge on a Type 6 complex is always neutral.
Chemistry:

In polar solvents species dissociate to give independently solvated ions. While in solution, the complex anion part of a Type 6 complex is susceptible to ligand transfer or substitution. The s-LUMO ion part of the complex usually acts as a spectator ion, however, choice of ion influences solubility.

Reagents such as lithium aluminium hydride and sodium borohydride act as hydride ion donor complexes. Type 6 hydride complexes are weaker proton abstracters than the very basic Type 5 complexes and they are correspondingly more suitable for use by organic chemists as sources of reducing nucleophilic hydride ion:

Congeneric Series:

Many important ligand replacement congeneric series are known, for example:

Type 6 Lewis acid/base complex (generic)
Beryllium silicate

more here
Borax

more here
Calcium tungstate

more here
Lithium aluminium hydride

more here
Lithium borohydride

more here
Lithium tri-tert-butoxy aluminium hydride

more here
Pentasulfide dianion

more here
Potassium aluminium hydride

more here
Potassium borohydride

more here
Potassium buckide

more here
Potassium dichromate(VI)

more here
Potassium hexachloro platinate

more here
Potassium manganate(V)

more here
Potassium manganate(VI)

more here
Potassium nitrate

more here
Potassium perbromate

more here
Potassium perchlorate

more here
Potassium rhenium nonahydride

more here
Potassium tetrachloroplaninate(II)

more here
Sodium aluminium hydride

more here
Sodium argentocyanide

more here
Sodium aurocyanide

more here
Sodium borohydride

more here
Sodium chromate

more here
Sodium cyanoborohydride

more here
Sodium dichromate

more here
Sodium hexafluoroaluminate

more here
Sodium hexafluorosilicate

more here
Sodium perchlorate

more here
Sodium tetrafluoroborate

more here
Tetrasulfide dianion

more here
Trisulfide dianion

more here
Zeise's salt

more here


Interactions and reactions classified as:
Type 6 Lewis Acid/Base Complexation Chemistry
      1 +1 1
      1 +1 1
      1 +1 1
      2 +1 1
      3 +1 1
      2 +1 1
       +
      2 +1 1
      2 +1 1
      1 +3 1
      4 +8 +1 +2 4 +4
      4 +8 +1 +2 4 +4
      1 +1 1
      1 +1 1
      1 +1 1
      1 +1 1
      1 +1 1
      1 +1 1 +1
      1 +1 1 +1
      1 +1 1 +1
      1 +1 1 +1
      1 +1 1 +1
      2 +2 2 +1 +1
      2 +2 2 +1 +1
      2 +1 1
       +
      2 +1 1
      3 +1 1
      2 +1 1
      2 +1 1
      2 +1 1
      2 +1 1



Poster
Nucleophiles & Bases

© Mark R. Leach 1999-


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