1. Coordination Compounds
They’re complex.

2. A coordination compound is the result of a Lewis acid-base reaction.
M+a x :L-b  [MLx]a-xb
Lewis Acid Lewis Base Complex Ion
A coordination compound is an ionic compound that includes a complex ion.

3. For example “Ligand” =“tied on” Cu+2 + 4:NH3  [Cu(NH3)4] +2
Lewis Acid Lewis Base Complex Ion
The complex ion is a metal ion with ligands “tied on” to it.

4. tetraamminecopper (II) sulfate
For example
Cu+2 +SO :NH3  [Cu(NH3)4]SO4
The same complex ion as part of a coordination compound:
tetraamminecopper (II) sulfate

5. For example
You have seen that the anhydrous copper (II) ion is colorless. In an aqueous system:
[Cu(H2O)6]+2 + 4:NH3 [Cu(NH3)4H2O] +2
…the copper (II) ion is already part of a complex

6. Remember hydrates?
CuSO4•5H2O

7. pentaaquocopper (II) sulfate
Remember hydrates?
CuSO4•5H2O
Or is it….
[Cu(H2O:)5]SO4?
pentaaquocopper (II) sulfate

8. We use brackets around a complex ion.
A coordination compound has a complex ion (cation, anion or both!)

9. Naming a coordination compound
Name the (+) ion first.
Name (-) ion
How do we name the complex ion?

10. Start with the metal—state the oxidation number.
Use Latin roots and –ate ending when it is an anion (- ion) .
Prefixes (with numerical prefixes) show ligands. Many ligands end in –o-.
Special names when used as a ligand

11. Special names when used as a ligand
H2O– aquo-
NH3– ammine-
CN- --cyano-
CO --carbonyl-
OH- --hydroxo-
Chloro- iodo- bromo- etc.
When using (en) or (EDTA), numerical prefixes include: bis- for 2, tris- for 3, tetrakis- for 4

12. Different ligands are listed in alphabetical order (regardless of numerical prefix)