Grade Upto college level Physical Chemistry
Write the postulates of werner’s theory.
3 Answers
Sunil Kumar FP
Postulates of Werner’s Theory of Coordination Compounds
In coordination compounds, there are two types of linkages (valences) − primary and secondary.
The primary valences are ionisable, and are satisfied by negative ions.
The secondary valences are non-ionisable, and are satisfied by negative ions or neutral molecules. The secondary valence is equal to the coordination number of a metal, and remains fixed for a metal.
Different coordination numbers have characteristic spatial arrangement of ions or groups bound by the secondary linkages.
In coordination compounds, there are two types of linkages (valences) − primary and secondary.
The primary valences are ionisable, and are satisfied by negative ions.
The secondary valences are non-ionisable, and are satisfied by negative ions or neutral molecules. The secondary valence is equal to the coordination number of a metal, and remains fixed for a metal.
Different coordination numbers have characteristic spatial arrangement of ions or groups bound by the secondary linkages.
Maurine
Coordination compounds requires 2kinds of bonding, these are primary and secondary bondingPrimary bonding in which the positive charge of central atom is balanced by negative ionof the compound, secondary bonding in which molecules or ions orligands are directly attached to the transition metal
G G Thirupthika
(i) Every metal atom has two types of valencies
- Primary valency or ionisable valency
- Secondary valency or non ionisable valency
(ii) The primary valency corresponds to the oxidation state of the metal ion.
The primary valency of the metal ion is always satisfied by negative ions.
(iii) Secondary valency corresponds to the coordination number of the metal ion or atom. The secondary valencies may be satisfied by either negative ions or neutral molecules.
(iv) The molecules or ion that satisfy secondary valencies are called ligands.
(v) The ligands which satisfy secondary valencies must project in definite directions in space. So the secondary valencies are directional in nature whereas the primary valencies are non-directional in nature.
(vi) The ligands have unshared pair of electrons. These unshared pair of electrons are donated to central metal ion or atom in a compound. Such compounds are called coordination compounds.
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