L17S08 Hybridization%20MOs,%20Resonance

L17S08 Hybridization%20MOs,%20Resonance - L17:...

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Unformatted text preview: L17: "Hybridization MOs, Resonance" Summary 2003 M.Kubinec,UC Regents L17-1 Covalent Bonding, Molecular Orbitals + + * He 1s He2 2003 M.Kubinec,UC Regents Bonding * Antibonding Li2 Be2 * (2s) 1s He (2s) L17-2 BOND ORDER (BO) BO = # bonding e- - # antibonding e2 2003 M.Kubinec,UC Regents L17-3 M.Kubinec, H.Nitsche, UCB 1 L17: "Hybridization MOs, Resonance" Sigma, Pi bonding * * + + * * y x * 2px 2003 M.Kubinec,UC Regents 2px 2py 2pz x y 2py 2pz L17-4 Three Mutually Perpendicular 2p orbitals on Two Adjacent Boron Atoms Signs indicate orbital phases 2003 M.Kubinec,UC Regents L17-5 The p Orbitals Overlap to Bonding and Antibonding Orbitals Signs indicate orbital phases 2003 M.Kubinec,UC Regents L17-6 M.Kubinec, H.Nitsche, UCB 2 L17: "Hybridization MOs, Resonance" ChemQuiz 16.4 Which process involving a photon is responsible for the conversion of O2 triplet to O2 singlet ? O2 (triplet) paramagnetic O2 (singlet) diamagnetic A) absorption B) emission C) ionization 2003 M.Kubinec,UC Regents L17-7 Molecular Orbitals: Polyatomics Orbitals: C Summary 2 180 Steric Number Bond Angle Hybridization sp C 3 120 sp2 sp3 L18-14 C UC Regents 4 109 2003 M.Kubinec,UC Regents L17-9 Molecular Orbitals: Polyatomics Steric Number Bond Angle Examples acetylene C 2 180 180 C 3 120 120 graphite C 4 109 109 diamond, polyethylene L17-10 2003 M.Kubinec,UC Regents M.Kubinec, H.Nitsche, UCB 3 L17: "Hybridization MOs, Resonance" sp Hybrid orbitals one s orbital one p orbital 2003 M.Kubinec,UC Regents two sp orbitals L17-11 sp Hybrid orbitals one s orbital one p orbital two sp orbitals Steric Number Bond Angle 2 180 180 L17-12 2003 M.Kubinec,UC Regents sp2 Hybrid orbitals one s orbital two p orbitals 2003 M.Kubinec,UC Regents three sp2 orbitals L17-13 M.Kubinec, H.Nitsche, UCB 4 L17: "Hybridization MOs, Resonance" sp2 Hybrid orbitals one s orbital two p orbitals 2003 M.Kubinec,UC Regents three sp2 orbitals Steric Number 3 Bond Angle 120 120 L17-14 sp3 Hybrid orbitals one s orbital three p orbitals 2003 M.Kubinec,UC Regents four sp3 orbitals L17-15 sp3 Hybrid orbitals one s orbital three p orbitals 2003 M.Kubinec,UC Regents four sp3 orbitals Steric Number 4 Bond Angle 109 109 L17-16 M.Kubinec, H.Nitsche, UCB 5 L17: "Hybridization MOs, Resonance" Molecular Orbitals: Polyatomics Steric Number Bond Angle Hybridization C 2 180 180 sp sp2 sp3 L17-17 C 3 120 120 C 4 109 109 2003 M.Kubinec,UC Regents ChemQuiz 17.1 What is the hybridization of the C orbitals in C6H6? benzene A) sp 2003 M.Kubinec,UC Regents B) sp2 C) sp3 L17-18 Multiple bonds two py form and * bond: sp2 s bond: bond: py py bond: H C H C H H bond: sp2 sp2 bond: two sp2 form and * 2003 M.Kubinec,UC Regents L17-20 M.Kubinec, H.Nitsche, UCB 6 L17: "Hybridization MOs, Resonance" ChemQuiz 17.2 Solution steric number on O = 4 steric number on C = 3 H H C H H C O H Lactic Acid O C O H 1) spC + spO 2003 M.Kubinec,UC Regents 2) pzC + pzO 3) sp2C + sp3O L17-22 (a) sp-hybridized Nitrogen Atom sp(b) Sigma Bond in the N2 Molecule (c) The two pi Bonds in N2 2003 M.Kubinec,UC Regents L17-23 Sigma-bonding in Benzene 2003 M.Kubinec,UC Regents L17-24 M.Kubinec, H.Nitsche, UCB 7 L17: "Hybridization MOs, Resonance" Multiple bonds: Polyatomics, Resonance Delocalization of electrons ~ Resonance 2003 M.Kubinec,UC Regents L17-25 ChemQuiz 17.3 Which molecular orbital in benzene formed from the atomic orbitals shown has the highest energy? energy? A) B) C) L17-26 2003 M.Kubinec,UC Regents Lecture Complete 2003 M.Kubinec,UC Regents L17-28 M.Kubinec, H.Nitsche, UCB 8 ...
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This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at University of California, Berkeley.

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