L07 Chem 261 Lecture Notes - Lecture 3: Fluorine, Antibonding Molecular Orbital, Trigonal Planar Molecular Geometry
13 Dec 2016
School
Department
Course
Professor
Document Summary
Lecture 3: valence bond theory, isomers, and intermolecular forces. Always check to make sure there are no empty mos (ie atoms deficient of an octet) In stable neutral molecules where all octets are complete, empty n. b. (c-c): 2 sp3 hybrid aos in phase, *(c-c): 2 sp3 hybrid aos out of phase. (c-h): sp3 hybrid ao and 1s ao in phase, *(c-h): sp3 hybrid ao and 1s ao out of phase: visualized (just draw one of each bond type, take orbital contributions into account, **comparing bond strengths** Bond dissociation energy (bde) = the energy required to break a bond. Above, the stronger bond is c-h since it has a greater bde, and therefore more energy is required to break that bond: identify frontier mos. Homo: (c-c), this is a higher energy orbital since it has a lower bde. 3 sp2 hybrid orbitals on each carbon, leaving 1 p orbital left over on each carbon.
