Chemistry 125A: Freshman Organic Chemistry I - Lecture 15: Chemical Reactivity: SOMO, HOMO, and LUMO - Professor J. Michael McBride
Lecture 15 : Chemical Reactivity: SOMO, HOMO, and LUMO
Professor McBride begins by using previous examples of "pathological"
bonding and the BH_3 molecule to illustrate how a chemist's use of
localized bonds, vacant atomic orbitals, and unshared pairs to
understand molecules compares with views based on the molecule's own
total electron density or on computational molecular orbitals. This
lecture then focuses on understanding reactivity in terms of the overlap
of singly-occupied molecular orbitals (SOMOs) and, more commonly, of an
unusually high-energy highest occupied molecular orbital (HOMO) with an
unusually low-energy lowest unoccupied molecular orbital (LUMO). This
is shown to be a generalization of the traditional concepts of acid and
base. Criteria for assessing reactivity are outlined and illustrated.
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