L1 /
5
CH1012
OXIDATION STATE
• For simple cases
the T-metal oxidation state is equal to the charge on the metal ion once all the ligands have been removed.
T-Metal ox state
= (complex - ligand) charges
eg. [Co(NH3)4Cl2]Cl Þ +1 = Co + (4x0 + 2x-1)
re-arrange Þ Co = +1 - (4x0 + 2x-1) = +3
eg. [Co(NH3)4Cl2]Cl Þ +1 = Co + (4x0 + 2x-1)
re-arrange Þ Co = +1 - (4x0 + 2x-1) = +3
• Examples of complexes (or complex ions) with coordination numbers 2, 4 & 6 are given in the next Table.
