L16S08 MolecularOrbitals

L16S08 MolecularOrbitals - L 16"Molecular...

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Unformatted text preview: L 16: "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 2004 M. Kubinec, A. Pines Right-handed RightDNA Helix L16-1 L5-9 Non Superimposable Mirror Images 2004 M. Kubinec, A. Pines L15-2 sfs Chiral Molecules Alanine N C C O O C O O N C C C Left-handed LeftDNA Helix 2004 M. Kubinec, A. Pines L D Right-handed RightDNA Helix L15-3 2004 M.Kubinec, A. Pines 1 L 16: "Molecular Orbitals" Summary 2004 M. Kubinec, A. Pines L16-4 Covalent Bonding, Molecular Orbitals + + * H 1s H2 2004 M. Kubinec, A. Pines Bonding *Antibonding 1s H paramagnetic diamagnetic L16-5 BOND ORDER (BO) BO = # bonding e- - # antibonding e2 2004 M. Kubinec, A. Pines L16-6 2004 M.Kubinec, A. Pines 2 L 16: "Molecular Orbitals" Covalent Bonding, Molecular Orbitals + + * He 1s He2 2004 M. Kubinec, A. Pines Bonding * Antibonding Li2 Be2 * (2s) 1s He (2s) L16-7 ChemQuiz 16.1 Which of the following diatomic species becomes more stable upon ionization? 1) H2 2004 M. Kubinec, A. Pines e- 2) He2 3) Li2 L16-8 Three Mutually Perpendicular 2p orbitals on Two Adjacent Boron Atoms Signs indicate orbital phases 2004 M. Kubinec, A. Pines L16-10 2004 M.Kubinec, A. Pines 3 L 16: "Molecular Orbitals" The p Orbitals Overlap to Bonding and Antibonding Orbitals Signs indicate orbital phases 2004 M. Kubinec, A. Pines L16-11 Sigma, Pi bonding * * + + * * y x * 2pz 2004 M. Kubinec, A. Pines 2pz 2px 2py x y 2px 2py L16-12 MO Bond Descriptions B2 Order Type C2 2 N2 3 O2 2 F2 1 Ne2 0 1 * * 2004 M. Kubinec, A. Pines * * L16-13 2004 M.Kubinec, A. Pines 4 L 16: "Molecular Orbitals" An Apparatus used to Measure the Paramagnetism of a Sample 2004 M. Kubinec, A. Pines L16-14 ChemQuiz 16.2 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 L16-15 ChemQuiz 16.3 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 + - N+ - 2) N2 ~ N2 + - 3) N2 < N2 L16-17 + 2004 M. Kubinec, A. Pines 2004 M.Kubinec, A. Pines 5 L 16: "Molecular Orbitals" 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 1) absorption 2) emission 3) ionization 2004 M. Kubinec, A. Pines L16-19 Lecture Complete 2004 M. Kubinec, A. Pines L16-21 2004 M.Kubinec, A. Pines 6 ...
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