Freshman Organic Chemistry II (CHEM 125B)
Spectroscopic determination of bond dissociation energies is relatively straightforward for many diatomic molecules, but for polyatomic molecules it requires merging the results from a variety of challenging experiments. Professor Ellison describes how such techniques as flowing-afterglow mass spectroscopy and negative-ion photoelectron spectroscopy together with data on free-radical kinetics and heats of formation have allowed precise determination of the O-H, C-H, and C-O bonds in methanol and other compounds. Interpreting these reliable data provides new insight into the nature of chemical bonding and "resonance".
00:00 - Chapter 1. Diatomic Bond Dissociation Energy from Spectroscopy
01:28 - Chapter 2. O-H BDE from Acidity in the Flowing Afterglow
12:35 - Chapter 3. C-H BDE from Radical Equilibrium
18:34 - Chapter 4. C-O BDE from Radical Heats of Formation. Potential Errors
23:20 - Chapter 5. Interpreting BDEs
35:43 - Chapter 6. Questions: Hot Bands and Resonance Stabilization
Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu
This course was recorded in Spring 2011.
Tagged under: bond dissociation energy,acidity/negative ion cycle,flowing afterglow,gas phase acidity,photoelectron,heat formation,hot band,resonance stabilization
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