Nomenclature of
coordination compounds:
1) Orders of naming ions in
coordination complexes :
The
names of neutral coordination complexes are given without spaces and for ionic
coordination complexes the cation is named first & then the anion separated
by a space.
Here
the coordination complex is neutral, so no spaces are necessary. The word ‘ mer' is used for expressing the
geometry.
In the
above examples, the cations sodium is named first and then separated by a space
from the names of the anions
2) Naming the coordination
sphere: ligands are named first & then the metal ion.
3) Names of the ligands:
Negative ligands end in –o & the positive ligands end in –ium. The neutral
ligands are named as such.
4) Order of naming the
ligands: alphabetical order irrespective of their charge. ( IUPAC convention)
5) Numerical prefix to
indicate the number of ligands:
Remember
that you never have to indicate the number of cations and anions in the name of
an ionic compound .
6)
Ending of names:
7) Oxidation state of
the central ion: Roman numerical (such as II, III, IV) at the end of metal part
without any spacing.
8) Bridging group: ยต-
is written as a prefix of the ligand name.
9) Point of
attachment: if there is more than one atom for attachment with metal then the
symbol of atom is written after the name of ligand.
10) Isomer:
Q. You can have a
compound where both the cation and the anion are complex ions. Notice how the
name of the metal differs even though they are the same metal ions. What's the
name of that type of compound e.g. [Ag(NH3)2][Ag(CN)2] ?
Answer: diamminesilver(I) dicyanoargentate(I)
Q. Write the name of
the following complexes:
1.
[CoCl3(NH3)3]
2.
[Co(ONO)3(NH3)3]
3.
[Fe(ox)2(H2O)2]−
4.
Ag2[HgI4]
Structure of this compound
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