Bidentate & Multidentate Ligands
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Transcript of Bidentate & Multidentate Ligands
Bidentate & Multidentate Bidentate & Multidentate LigandsLigands
-Explain and use the term bidentate ligandExplain and use the term bidentate ligand
- Describe stereoisomerism in transition Describe stereoisomerism in transition element multidentate complexes (cis-trans & element multidentate complexes (cis-trans &
optical isomerism) optical isomerism)
Bidentate Ligands – Able to donate two lone pairs to central metal ion
Ethane 1,2 diamine (shortened to ‘en’)
NH2CH2CH2NH2
Octahedral shape[Ni(en)3]2+
3 x bidentate ligands...each able to form 2 x coordinate
bonds... coordination number =
6
Cis & Trans Isomers
[Cr(C2O4)2(H2O) 2]-
Hexadentate Ligand - EDTA
6 lone pairs to use to form coordinate bonds
Optical Isomers:- non-superimposable mirror images
Requirements:•3 x bidentate ligands•2 x bidentate + 2 x monodentate ligands•1 x hexadentate ligand
Summary Question
• Iron (III) can form the complex ion [Fe(C2O4)3]3-
with three ethanedioate ions. The ethanedioate ion is a bidentate a) Explain the term “bidentate ligand”.b) What is the coordination number of the [Fe(C2O4)3]3-
complex.c) Use your answer to part (b) to suggest what shape
the [Fe(C2O4)3]3- complex is and draw it.