DMPS

1. In coordination compounds, central metal ions exhibit both primary and secondary valences

• the primary valency is ionizable


• the secondary valency is not ionizable


• the secondary valency corresponds to coordination number (the central metal ion and ligands are not ionizable)

2. Every metal atom has a fixed number of secondary valencies (coordination number(s))

3. The metal atom tends to satisfy both its primary valency as well as its secondary valency

• primary valency is satisfied by negative ions (metal ion has a positive charge)


• secondary valency (coordination number) is satisfied either by negative ions or by neutral molecules


• in certain cases, a negative ion may satisfy both types of valencies
  

4. The coordination number (secondary valencies) are always directed towards the fixed positions in space and this leads to definite geometry of the coordination compound

DMPS related to Werner’s Theory

• In this case, the primary valency is the central metal ions and the secondary valency is the DMPS


• For mercury, the primary valency (oxidation number) is +2 and the secondary valency corresponds to coordination number, which is 4.
  

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