L18S07_MolecularOrbitals 02-28-06

L18S07_MolecularOrbitals 02-28-06 - L 18"Molecular...

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Unformatted text preview: L 18: "Molecular Orbitals" Polymerization -A-B-A-B-A-BH H H-N-(CH2)6-N-H Molecules of the same formula with different arrangements of the atoms Isomers - - - Hexamethylene diamine Previously = A O O Cl-C-(CH2)8-C-Cl Cl= Sebacoyl Chloride B Structural HH H-C-C-O-H HH - Cl Cl C=C H H Cl H Stereo Cl H C=C H Cl .. A.Pines,M.Kubinec,UCB .... L5-10 H H H-C-O-C-H H H - A.Pines,M.Kubinec,UCB C=C Cl H L6-10 Isomers: Stereo (Chiral) (Chiral) Chiral Molecules Alanine N C C O O C O O N C C C L A.Pines,M.Kubinec,UCB D L5-6 Left-handed LeftDNA Helix A.Pines,M.Kubinec,UCB L D Right-handed RightDNA Helix 2004 M. Kubinec, A. Pines L18-1 L5-9 ChemQuiz 17.3 Which of the following structural isomers of octane is chiral? chiral? C H2 C H3 C C C H2 C H2 C-C C H2 C H2 C H3 C H2 - - - C - 2) C-C-C-C-C C C - - 1) C-C-C-C-C 2004 M. Kubinec, A. Pines 3) C-C-C-C C - - C C L18-2 Covalent Bonding, Molecular Orbitals Covalent Bonding, Molecular Orbitals + Summary + H2 He2 Bonding: Antibonding: * Antibonding: Li2 Be2 + + * He 1s L13-1 Bonding * Antibonding Li2 Be2 * (2s) * 1s A.Pines,M.Kubinec,UCB * 2s 2s 1s He2 1s He (2s) L11-4 2002 A.Pines,M.Kubinec,UCB Sigma, Pi bonding Order Type B2 1 C2 2 N2 3 O2 2 F2 1 Ne2 0 + + * * y x 2pz 2px 2py x y L13-8 * * 2px 2py * * L18-4 L13-9 * 2pz A.Pines,M.Kubinec,UCB A.Pines,M.Kubinec,UCB 2004 M. Kubinec, A. Pines 2004 M.Kubinec, A. Pines 1 L 18: "Molecular Orbitals" Covalent Bonding, Molecular Orbitals + + * H 1s H2 2004 M. Kubinec, A. Pines Bonding *Antibonding 1s H paramagnetic diamagnetic L18-5 BOND ORDER (BO) BO = # bonding e- - # antibonding e2 2004 M. Kubinec, A. Pines L18-6 Covalent Bonding, Molecular Orbitals + + * He 1s He2 2004 M. Kubinec, A. Pines Bonding * Antibonding Li2 Be2 * (2s) 1s He (2s) L18-7 2004 M.Kubinec, A. Pines 2 L 18: "Molecular Orbitals" ChemQuiz 18.1 Which of the following diatomic species becomes more stable upon ionization? 1) H2 2004 M. Kubinec, A. Pines e- 2) He2 3) Li2 L18-8 Sigma, Pi bonding * * + + * * y x * 2pz 2004 M. Kubinec, A. Pines 2pz 2px 2py x y 2px 2py L18-10 Three Mutually Perpendicular 2p orbitals on Two Adjacent Boron Atoms Signs indicate orbital phases 2004 M. Kubinec, A. Pines L18-11 2004 M.Kubinec, A. Pines 3 L 18: "Molecular Orbitals" The p Orbitals Overlap to Bonding and Antibonding Orbitals Signs indicate orbital phases 2004 M. Kubinec, A. Pines L18-12 MO Bond Descriptions B2 Order Type C2 2 N2 3 O2 2 F2 1 Ne2 0 1 * * 2004 M. Kubinec, A. Pines * * L18-13 An Apparatus used to Measure the Paramagnetism of a Sample 2004 M. Kubinec, A. Pines L18-14 2004 M.Kubinec, A. Pines 4 L 18: "Molecular Orbitals" ChemQuiz 18.2 For the formation of O2 from O atoms the total paramagnetism of the sample... O+O O2 N S 1) increases 2) ~same 3) decreases 2004 M. Kubinec, A. Pines L18-15 ChemQuiz 18.3 Consider ionization and electron capture in N2. Which is true of the bond strengths of the products? N N e- N N - e- N 1) N2 > N2 + + 2) N2 ~ N2 + + N+ - 3) N2 < N2 L18-17 2004 M. Kubinec, A. Pines ChemQuiz 18.4 Which process involving a photon is responsible for the conversion of O2 triplet to O2 singlet ? O2 (triplet) paramagnetic O2 (singlet) diamagnetic 1) absorption 2) emission 3) ionization 2004 M. Kubinec, A. Pines L18-19 2004 M.Kubinec, A. Pines 5 L 18: "Molecular Orbitals" Lecture Complete 2004 M. Kubinec, A. Pines L18-21 2004 M.Kubinec, A. Pines 6 ...
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