The d-block Coordination Chemistry. Objectives Must Explain and use the terms ligand/complex/complex ion and ligand substitutions. Should Describe the.

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Presentation transcript:

The d-block Coordination Chemistry

Objectives Must Explain and use the terms ligand/complex/complex ion and ligand substitutions. Should Describe the formation of complexes in terms of dative (coordinate) bonding and shapes of complexes. Could Describe ligand substitution reactions using examples.

Transition metal ions in solution When a transition metal compound such as cobalt chloride is dissolved in water it becomes Co 3+ and Cl - ions. The Co 3+ ions attract water molecules around them to form something we call a complex.

Charged or not?

How do we write complexes down?

AfL – using whiteboards Write the symbol formula for:

Ligands and bonding

AfL – test your understanding What is the ligand and coordination number in each case:

Coordinate (dative) bonding

Shapes of complexes

Square planar

Polydentate ligands Some ligands can bond to the metal more than once. Each molecule of ethandioate bonds to the metal twice. Each molecule of EDTA 4- bonds to the metal six times.

Stability

Colour changes xions/ligandexch.html

Other substitution reactions