Lewis Acid/Base Interaction Matrix Database


Type 24 Lewis Acid/Base Complexation Chemistry
π-Organometallic Chemistry

Bonding:

The bonding in π-organometallics must be considered using LCAO MO theory because the normal rules of valency break down. For example, is the valency of the Fe(II) ion in the metallocene in ferrocene, Fe(C5H5)2? Is the iron 2 valent or 10 valent?

The hapto nomenclature, ηx, where the hapacity (Wikipedia) gives the number of conjugated p orbitals which ligate to a metal, rather than the number of electrons.

Charge: Complexes may be negatively charged, positively charged or they may be neutral.
Chemistry:

There is a very extensive π-heavy metal chemistry known: all heavy metals are known to form π-organometallic compounds.

Lewis Base
Number of
p–
Orbitals
Number of
π
Electrons
   Lobe-HOMO
η1
2
   Carbene
η1
2
   Alkene
η2
2
   Allyl cation
η3
2
   Allyl anion
η3
4
   1,3-Diene
η4
4
   Cyclopentadienyl anion
η5
6
   Benzene
η6
6
   Tropylium cation
η6
6
Type 24 Lewis acid/base complex (generic)
Benzenechromium tricarbonyl

more here
(Bicyclo[2.2.1]hepta-2,5-diene)rhodium(I) chloride dimer

more here
Bis(butadiene)iron monocarbonyl

more here
Bis-allyl palladium(II) chloride

more here
Bis-propene palladium(II) chloride

more here
Butadiene iron tricarbonyl

more here
di--Chlorobis(1,5-cyclooctadiene) -dirhodium(I)

more here
Chromium carbonyl

more here
Cycloheptatriene chromium tricarbonyl

more here
Dicobalt octacarbonyl

more here
Diiron nonacarbonyl

more here
Dimanganese decacarbonyl

more here
Ferrocene

more here
Iron pentacarbonyl

more here
Nickelocene

more here
pi-Organometallic (generic)

more here
Titanocene dichloride

more here
Tropylium chromium tricarbonyl cation

more here
Uranocene

more here
Vanadium carbonyl

more here
Zeise's salt

more here
Zirconocene chloride hydride

more here


Interactions and reactions classified as:
Type 24 Lewis Acid/Base Complexation Chemistry
      1 +4 1
      1 +1 1 +1
      2 +2 +4 1
      2 +2 +2 1
      1 +1 +3 1
      1 +2 +1 1
      2 +2 +2 1
      2 +2 +2 1
      1 +2 1
      1 +2 1
      1 +2 +2 1
      1 +2 +1 +1 1
      1 +1 +3 1
      1 +1 +3 1
      1 +1 +3 1
      1 +2 1
       +
      1 +5 1



Poster
Nucleophiles & Bases

© Mark R. Leach 1999-


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