lecture 4b

lecture 4b - CHEM 6BL Experiments 4A-B Iron Oxalate Complex...

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CHEM 6BL Experiments 4A-B: Iron Oxalate Complex Synthesis/Analysis Instructor: Dr. S. Berniolles Page 1 1 Chemistry 6BL Lab/Course Schedule Chemistry 6BL Lab/Course Schedule Prelab Expt. 3 Expt. 2 Report Expt. 3 (Parts I-II) Expt. 3 (Parts III-IV) 1st lab 2nd lab Iron Complex synthesis/Analysis (Expts. 4A-B) Oct. 20 Prelab & Report Due Dates Lab Schedule Lab Period Lecture & Exam Schedule Date 2 CHEM 6BL Exam 1 CHEM 6BL Exam 1 z EXAM #1 IN LECTURE: Mon, Nov. 3 z Typically 15 Multiple-choice questions z Based on Experiments #1-4A Lecture Topics Pre-/Post-Lab Questions Calculations in Lab 3 z Inorganic Synthesis (Experiment 4A) z z z Redox Reactions z 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 4 Experiment 4A Experiment 4A : Inorganic Synthesis : Inorganic Synthesis z 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- 5 Coordination Compound Coordination Compound Electrically neutral compound in which at least one of the ions present is a complex , a species consisting of: z A central metal atom or ion (usually a transition metal) z Ligands 6 Coordination Complex Coordination Complex z Central metal atom/ion is a transition metal Transition metals act as strong Lewis Acids Lewis Acids (i.e., e- pair acceptors ) z Ligands bond to the metal center Ligands are Lewis Bases Lewis Bases (i.e., e- pair donors ) Examples: H 2 Ö:, :NH 3 , :CN: (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 7 Coordination Number (C.N.) Coordination Number (C.N.) z C.N. = Number of points at which ligands are attached to the central metal atom z Usually, C.N. = 2, 4, 6 (& 5) 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 8 Complex Geometries: Complex Geometries: C.N. = 2 C.N. = 2 z C.N. = 2: Linear Compound Simplest shape Example : H 3 N Ag + NH 3 9 Complex Geometries: Complex Geometries: C.N. = 4 C.N. = 4 z C.N. = 4: Tetrahedral z C.N. = 4: Square Planar Fe Cl Cl Cl Cl Fe NH 4 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 10 Complex Geometries: Complex Geometries: C.N. = 6 C.N. = 6 z C.N. = 6: Octahedral The vast majority of these complexes H 3 N NH 3 NH 3 Cl H 3 N Cl Co 3+ 11 Ligand Types Ligand Types Some ligands bind more than one site at the metal (i.e., have >1 Lewis Base site) Monodentate ”: binds just one metal site Most ligands: e.g. NH 3 , H 2 O, SO 4 , Cl , etc. Bidentate
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This note was uploaded on 05/31/2009 for the course CHEM 6BL taught by Professor Berniolles during the Spring '08 term at UCSD.

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lecture 4b - CHEM 6BL Experiments 4A-B Iron Oxalate Complex...

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