Lewis Acid/Base Interaction Matrix Database

s-LUMO Lewis Acids

Group I & II Metal Cations

Search for s-Lewis acid species in The Chemical Thesaurus

FMO Topology:

The s-Lewis acids are the cations of the Group I alkali and Group II alkaline earth metals.

The shell-like LUMO (2s, 3s 4s 5s & 6s AOs) is superimposed upon a sphere of closed electron shells which defines the ionic radius of the cation.

Charge: Positive
HSAB: Intrinsically hard. Fajans rules indicate that small highly charged cations, for example Be2+, are able to polarise anions and give polar covalent complexes.
Chemistry: Used as counter ions or spectator ions to interesting Lewis bases. Very important biochemical species.
Congeneric Series:

There are two s-LUMO series:

Group I alkali metals: Li+  Na+   K+   Rb+   Cs+
Group II alkali earth metals: Be2+   Mg2+  Ca2+   Sr2+   Ba2+

s-LUMO Lewis acid (generic)
Barium ion

more here
Beryllium ion

more here
Calcium ion

more here
Cesium cation

more here
Lithium ion

more here
Magnesium ion

more here
Potassium ion

more here
Rubidium cation

more here
Sodium ion

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Strontium ion

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Poster
Nucleophiles & Bases

© Mark R. Leach 1999-


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