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Complex Compounds:. What are they: Central metal cation Attached ligands (molecules or anions) Coordination Number : defines the # ligands (Useful link) Complex Compounds:. Cation : Lewis Acid (electron pair acceptor)

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Complex compounds

Complex Compounds:

What are they:

Central metal cation

Attached ligands(molecules or anions)

Coordination Number: defines the # ligands

(Useful link)

Complex compounds1
Complex Compounds:


Lewis Acid (electron pair acceptor)

Generally a transition metal cation

Also common: Al, Sn, Pb


Lewis Base (electron pair donor)

Common ligands: NH3, H2O CN-, Cl-, OH-

Understanding net charge
Understanding net charge:

Overall charge of coordinate compound/ion is determined by the sum of the charges on the metal and the attached groups.

Ex: Al(NH3)6+3

Al (OH)6-3

Coordination geometry
Coordination Geometry

Guideline for common compounds/ions

Nomenclature complex compounds
Nomenclature- complex compounds

  • Salts: name the cation first and then the anion

  • Complex ion or molecule: name the ligand first followed by metal

  • Table of common ligands:

    Example: [Cu(NH3)4]SO4 = tetraamminecopper(II) sulfate

Colors and coordination compounds
Colors and Coordination compounds

  • Attachment of ligands causes split of the electrons in the d-orbital to a low/high energy.

  • The energy separation (Δ) of these electrons provide unique colors: F-, Cl-,Br-< C2O42-< H2O< NH3<CN-


  • Many examples of color & coordinatecompounds: