15-Valence Bond Theory and Hybridization

15-Valence Bond Theory and Hybridization - 5.111 Lecture...

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5.111 Lecture Summary #15 October 14, 2009 15.1 Reading for today: Sections 3-4-3.7 Reading for Lecture 16: Sections 6.13, 6.15-6.18, 6.20 VALENCE BOND THEORY AND HYBRIDIZATION MO theory as we’ve seen it so far doesn't work well in all cases! CH 4 C 2s 2p z 2p x 2p y 2p z 2p x + + - - H H …predicts CH 2 as a stable species with a H-C-H bond of 90°. Application of MO approach to CH 4 ……. C Hybrid atomic orbitals 2s and 2p orbitals are combined to form “hybrid” atomic orbitals that can form four C-H bonds 2s 2p y 2p z 2p x E Electron promotion Hybridize sp 3 sp 3 sp 3 sp 3 2p z 2p x + - Hybridization - Valence Bond Approach C+ - + 2p y 2s - C C C - - - - + + + + Four sp 3 orbitals
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5.111 Lecture Summary #15 October 14, 2009 15.2 sp 3 109.5° C H H H H sp 3 sp 3 sp 3 sp 3 C sp 3 H 1s σ bond σ (C2sp 3 ,H1s) The four hybrid AOs have the correct symmetry to maximize separation of the bonds Same for C four-coordination generally C sp 3 sp 3 sp 3 sp 3 C sp 3 sp 3 sp 3 H H H H H H 1s 1s 1s 1s 1s 1s 109.5° C 2 H 6 Ethane σ bond σ (C2sp 3 ,C2sp 3 ) sp 3 Hybridization
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5.111 Lecture Summary #15
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This note was uploaded on 02/08/2010 for the course CHEM 143 taught by Professor Mike during the Spring '10 term at École Normale Supérieure.

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15-Valence Bond Theory and Hybridization - 5.111 Lecture...

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