04CHM114_0308

04CHM114_0308 - m: o E POff'OhI-‘h fw'fl- hula-A WV...

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Unformatted text preview: m: o E POff'OhI-‘h fw'fl- hula-A WV (Pink 51M . 5'1 Viflu-ot', CHEM 114 $2004 Mon Mar 8 Lecture No 20 0 Rama. flap»:- '7 Mu .4... "0" «K'WMI... "I, " CHAPTER 9. f ‘ “ - CHEMICAL BONDING AND METALLIC BONDING (Modern View) Last day: ’ SKIP ps 314-42 for the moment Section 9.7 (molecular orbitals) Molecular orbitals are obtained by solution of Schrofiflinger's wave equation for system of one electron and tWO 01‘ more centers of positive charge. H atom problem H; ion problem 9-"' e l \ GB" ®;_d_;@ m- cm "" h:\ "UH" ._J—- 6,5 #41:..— H; H2 (1 electron) (2 electrons) bond order 1/2 W _ (new term) h t 9. molecules 023 bonds ~_5_‘~.a 3.: r - 2; \ , f .. q Ur. n 3 l: I: The multinuclear case and the band theory of metals.(see sectio 0*28 (for diatomic) Vi. 'fw'lud 028 an» fat Lin " 531. ______€‘.} —- " =5”; n -— ~ —— :6“ [Ohm a‘h‘w' n the“! 0 separation of individual orbital energies becomes vanishingly small, so electrons alwa s "free". 5° L‘EL MA.“ u: Ch} H 0 filled vs half—filled bands 3 Molecular orbitals from _p__ electrons and the proper understanding of resonance hyrids (the approach from overlap of atomic orbitals).. see Fig. 9.37 Background: gaseous oxygen, Lewis structures, and paramagnetism (Fig. 9.41... what is going on? - Simplest fisualization....overlap of atomic orbitals Fig. 9.37 . 5 Sigma (0) pronds ('5' “'9‘! ijfi ‘ lH’quH- A as me ff WM 5 5-3 0 $é_ d. a 0 $10! 4 g and “'4”? pi (it) p bonds (onl for n: 2 or higher «9 ——> g 4 ud- So then we get the energy levels (small 23-2p interaction case) 6* \ H 1? 0vw.v‘i p—based 9,, (vs-$1. 3],? _\L4- 5nd] Energetics. Consider only the cases of N2, 02 and F2 1" 1—“ pi bonds and resonance: the case of ethylene Fig. 9.25 and benzene. —'o Q Fig. 9.28 "m 5 ‘2» Ma “N-j ‘f (en'l'ur: Tram" C dad-u deaths: :0 Cd. L‘M h mulls 6 "find-s" :1 tr 9" ...
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This note was uploaded on 11/01/2009 for the course CHM 114 taught by Professor Aksyonov during the Fall '08 term at ASU.

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04CHM114_0308 - m: o E POff'OhI-‘h fw'fl- hula-A WV...

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