Lecture 6 - Seeing Bonds by Electron Difference Density

author: J. Michael McBride, Department of Chemistry, Yale University
recorded by: Yale University
published: June 9, 2010,   recorded: September 2008,   views: 3176
released under terms of: Creative Commons Attribution No Derivatives (CC-BY-ND)
Categories

See Also:

Download Video - generic video source Download yalechem125f08_mcbride_lec06_01.mov (Video - generic video source 549.0 MB)

Download Video Download yalechem125f08_mcbride_lec06_01.flv (Video 645.9 MB)


Help icon Streaming Video Help

Related Open Educational Resources

Related content

Report a problem or upload files

If you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
Lecture popularity: You need to login to cast your vote.
  Bibliography

Description

Professor McBride uses a hexagonal "benzene" pattern and Franklin's X-ray pattern of DNA, to continue his discussion of X-ray crystallography by explaining how a diffraction pattern in "reciprocal space" relates to the distribution of electrons in molecules and to the repetition of molecules in a crystal lattice. He then uses electron difference density mapping to reveal bonds, and unshared electron pairs, and their shape, and to show that they are only one-twentieth as dense as would be expected for Lewis shared pairs. Anomalous difference density in the carbon-fluorine bond raises the course's second great question, "Compared to what?"

Problem sets/Reading assignment:

Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can be accessed from Professor McBride's on-campus course website, which was developed for his Fall 2008 students. Please see Resources section below.

Resources:

Professor McBride's web resources for CHEM 125 (Fall 2008)

Link this page

Would you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !

Write your own review or comment:

make sure you have javascript enabled or clear this field: