Lecture 4A

Lecture 4A - CHEM 7L Experiment 4A: Iron Oxalate Complex...

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CHEM 7L Experiment 4A: Iron Oxalate Complex Synthesis Page 1 1 Inorganic Synthesis (Experiment 4A) Redox Reactions Product Analysis : Redox Titrations & Spectrophotometry ( Experiments #4B & #4C ) 2 Experiment 4A : Inorganic Synthesis Expt. #4A involves “Complex” Chemistry Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O K w [Fe x (C 2 O 4 ) y ]·zH 2 O Fe 2+ 2 NH 4 + = 2+ 2 SO 4 2- = 4- K + Fe 3+ C 2 O 4 2- 3 Coordination Compound - Review Electrically neutral compound in which at least one of the ions present is a complex , a species consisting of: A central metal atom/ion (usually a transition metal) Ligands (neutral molecules or anions that have at least one atom with a lone pair of electrons)
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CHEM 7L Experiment 4A: Iron Oxalate Complex Synthesis Page 2 4 Coordination Complex - Review Central metal atom/ion is a transition metal Transition metals act as strong Lewis Acids i.e., e- pair acceptors Ligands bond to the metal center Ligands are Lewis Bases i.e., e- pair donors Examples: H 2 Ö:, :NH 3 neutral molecules :ÖH - , :Cl - charged ions 5 Coordination Number (C.N.) - Review C.N. = Number of electron pairs donated to the metal center Commonly, C.N. = 2, 4, 6 Ag(NH 3 ) 2 + C.N. = 2 Fe(Cl) 4 C.N. = 4 Fe(H 2 O) 4 (CN) 2 C.N. = 6 6 Complex Geometries: C.N. = 2 - Review C.N. = 2: Linear Compound Simplest shape Example: H 3 N Ag + NH 3
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CHEM 7L Experiment 4A: Iron Oxalate Complex Synthesis Page 3 7 Complex Geometries: C.N. = 4 - Review C.N. = 4: Tetrahedral C.N. = 4: Square Planar Fe Cl Cl Cl Cl NC CN NC CN Pt 2+ 8 Complex Geometries: C.N. = 6 - Review C.N. = 6: Octahedral The vast majority of these complexes H 3 N NH 3 NH 3 Cl H 3 N Cl Co 3+ 9 Ligand Types - Review Some ligands bind at more than one site around the metal (i.e., have >1 Lewis base site) Monodentate ”: binds just at one metal site Most ligands: e.g. NH 3 , H 2 O, Cl , etc. Bidentate ”: can bind at two metal sites Ex: C 2 O 4 2– , ethylenediamine (en - NH 2 CH 2 CH 2 NH 2 ) Tridentate ”: can bind at three metal sites Ex: diethylenetriamine (dien) Hexadentate ”: can bind at six metal sites Ex: ethylenediaminetetraacetato (EDTA)
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CHEM 7L Experiment 4A: Iron Oxalate Complex Synthesis Page 4 10 Polydentate Ligands (Chelating Agents) : N C H 2 C H 2 CH 2 H 2 C H 2 N NH 2 H M H 2 CC H 2 N N CH 2 CH 2 H 2 C H 2 C C C C C O - O - O O O O O - O : M Diethylenetriamine (dien) Ethylenediamine-tetraacetato (EDTA) 11
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This note was uploaded on 06/01/2011 for the course CHEM 7L taught by Professor Bernoilles during the Spring '11 term at UCSD.

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Lecture 4A - CHEM 7L Experiment 4A: Iron Oxalate Complex...

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