Coordination Chemistry ligands bonding to metals.

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Presentation transcript:

Coordination Chemistry ligands bonding to metals

Donor-Acceptor Complexes

Definitions Lewis Acid = acceptor = usually a transition metal cation Lewis Base = donor = ligand = usually something with a lone electron pair Coordination number = # of metal-ligand attachments Denticity = # of attachments a ligand makes

Common Ligands Monodentate Ligands: Halides: F -, Cl -, Br -, I - O 2-, S 2-, OH -, CN - NH 3, H 2 O, CO Bidentate Ligands:Polydentate Ligands: heme, salen

Monodentate complexes

Bidentate ligand complexes Ni(DMG) 2 Co(en) 2 Cl 2

Bidentate complexes Co(en) 3 2+ Fe(phen) 3 2+

Polydentate complexes Co(salen) + chlorophyll

Polydentate complexes Fe-heme O 2 -Fe-heme

Geometric isomerism

Fac- isomer Mer- isomer

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