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CHEM202: Advanced Inorganic Chemistry

Unit 6: Organometallics of Transition Metals   Organometallic chemistry is the study of chemical compounds containing bonds between carbon atom(s) and a metal.  Organometallic chemistry combines aspects of inorganic chemistry and organic chemistry The properties of these complexes are largely dependent on the molecular orbital splittings involved.  These were discussed in Unit 3, which you may wish to revisit at this time.  Organometallic complexes have characteristics of both organic molecules and transition metals, and therefore they have a wide variety of applications, both current and potential.  Many biological molecules, like hemoglobin and chlorophyll, are actually organometallic complexes.    

Unit 6 Time Advisory
This unit should take you approximately 6 hours to complete.

☐    Introduction: 2.0 hours

☐    Subunit 6.1: 1.0 hour

☐    Subunit 6.2: 2.0 hours

☐    Subunit 6.3: 1.0 hour        

Unit6 Learning Outcomes
Upon successful completion of this unit, the student will be able to:
- Describe what is meant by an organometallic complex and discuss the implications of combining organic and inorganic chemistry. - Apply chelate (ligand) terminology and calculate coordination numbers of complexes, including those involving aromatic systems.  

  • Lecture: MIT: Principles of Chemical Science, Fall 2005: “Lecture 32: Coordination Complexes and Ligands” Link: MIT: Principles of Chemical Science, Fall 2005: “Lecture 32: Coordination Complexes and Ligands” (Adobe Flash, Mp4, or iTunes)
     
    Also available in:
    YouTube
     
    Instructions: Please watch the lecture (runtime = 50:57 minutes).  This material covers ligand interaction in coordination complexes and relies on your knowledge of molecular orbital splitting to understand why.  Be sure you have a firm grasp of the material covered in Unit 3 prior to watching this video.
     
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  • Reading: Purdue University: George M. Bodner’s “Coordination Complexes and Ligands” Link: Purdue University: George M. Bodner’s “Coordination Complexes and Ligands” (HTML)
     
    Instructions: Please read the entire webpage and work the practice problem contained within the text.  This material gives an overview of the chemistry involved in coordination complexes and their ligands.
     
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6.1 Different Types of Ligands   - Reading: Jim Clark’s Chemguide: “An Introduction to Complex Metal Ions” Link: Jim Clark’s Chemguide:  “An Introduction to Complex Metal Ions” (HTML)
 
Instructions: Please read the entire webpage.  This material examines the relationship between a central metal ion and its ligands, or what is bound to it.  Discussion also includes different types of ligands, starting with simple anion and monodentate ligands and progressing to polydentate ligands.  
 
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6.2 Chelating Ligands and the Dentate Terminology   - Reading: University of Rhode Island’s “Chemistry 401 Ligands” Link: University of Rhode Island’s “Chemistry 401 Ligands” (HTML)
 
Instructions: Please read the entire webpage.  The material includes terminology relating to ligands and their binding nature as well as several structures of the ligands themselves.  Oftentimes, ligands are represented by abbreviation only, so it is useful to familiarize yourself with their structure here.
 
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  • Reading: Rob Toreki’s Organometallic HyperTextBook: “Coordination Number and Coordination Chemistry Definitions” Link: Rob Toreki’s Organometallic HyperTextBook: “Coordination Number and Coordination Chemistry Definitions” (HTML)
     
    Instructions: Please read the entire webpage.  This site presents more complex problems dealing with determining the coordination numbers of molecules.  It also defines a few more terms.  Focus on the terminology here; aromatic ring systems and coordination numbers will be addressed in subunit 6.3.
     
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6.3 Metal Coordination to Aromatic Systems   - Reading: Rob Toreki’s Organometallic HyperTextBook: “Cyclopentadienyl Ligands” Link: Rob Toreki’s Organometallic HyperTextBook: “Cyclopentadienyl Ligands” (HTML)
 
Instructions: Please read the entire webpage.  This material addresses bonding between metal ions and aromatic ring systems such as cyclopentadiene.  Cyclopentadiene is commonly abbreviated Cp and is an instance where you are required to remember the structure.  Fluxionality of the ligands, which was discussed in subunit 5.2, is also mentioned here.

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