Lecture 4A-B Oxalate Synthesis

Lecture 4A-B Oxalate Synthesis - CHEM 6BL Experiments 4A-B:...

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CHEM 6BL Experiments 4A-B: Iron Oxalate Complex Synthesis/Analysis Instructor: Dr. S. Berniolles Page 1 Chemistry 6BL Lab/Course Schedule Date Lecture & Exam Schedule Lab Period Lab Schedule Prelab & Report Due 1 Dates Apr. 27 Iron Complex Analysis (Expts. 4B-C) 1st lab 2nd lab End Expt. 3 (Parts III-IV) Expt. 4A (Synthesis) Expt.2 Report Prelab Expt. 4A CHEM 6BL Exam 1 EXAM #1 IN LECTURE: Wed, May 6 EXAM #2 (Final) IN LECTURE: Wed, June 3 No Final on Final Exam Week 2 No Final on Final Exam Week! Typically 15 Multiple-choice questions Exam 1 Based on Experiments #1-4A Lecture Topics Lab Manual Procedures Pre-/Post-Lab Questions Calculations in Lab Inorganic Synthesis (Experiment 4A) 3 Redox Reactions Product Analysis : Redox Titrations & Spectrophotometry ( Experiments #4B & #4C )
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CHEM 6BL Experiments 4A-B: Iron Oxalate Complex Synthesis/Analysis Instructor: Dr. S. Berniolles Page 2 Experiment 4A : Inorganic Synthesis Expt. #4A involves “ Complex ” Chemistry Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O Fe 2+ 2 SO 4 2- = 4- 4 4 2 4 2 K w [Fe x (C 2 O 4 ) y ]·zH 2 O 2 NH 4 + = 2+ K + Fe 3+ C 2 O 4 2- Coordination Compound Electrically neutral compound in which at least one of the ions present is a complex , 5 a species consisting of: A central metal atom/ion (usually a transition metal) Ligands Coordination Complex Central metal atom/ion is a transition metal Transition metals act as strong Lewis Acids (i.e., e- pair acceptors ) 6 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 )
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CHEM 6BL Experiments 4A-B: Iron Oxalate Complex Synthesis/Analysis Instructor: Dr. S. Berniolles Page 3 Coordination Number (C.N.) C.N. = Number of electron pairs donated to the metal center 7 Commonly, C.N. = 2, 4, 6 Ag(NH 3 ) 2 + C.N. = 2 Fe(NH 4 ) 2 (SO 4 ) 2 C.N. = 4 Fe(H 2 O) 4 (CN) 2 C.N. = 6 Complex Geometries: C.N. = 2 C.N. = 2: Linear Compound Simplest shape 8 Example : H 3 N Ag + NH 3 Complex Geometries: C.N. = 4 C.N. = 4: Tetrahedral Cl NH 4 9 C.N. = 4: Square Planar Fe Cl Cl Cl Fe SO 4 H 4 N O 4 S NC CN NC CN Pt 2+
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CHEM 6BL Experiments 4A-B: Iron Oxalate Complex Synthesis/Analysis Instructor: Dr. S. Berniolles Page 4 Complex Geometries: C.N. = 6 C.N. = 6: Octahedral The vast majority of these complexes 10 H 3 N NH 3 NH 3 Cl H 3 N Cl Co 3+ Ligand Types 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 11 Most ligands: e.g. NH 3 , H 2 O, SO 4 , Cl , etc.
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This note was uploaded on 05/04/2009 for the course CHEM 630888 taught by Professor Berniolles during the Spring '08 term at UCSD.

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Lecture 4A-B Oxalate Synthesis - CHEM 6BL Experiments 4A-B:...

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