L16S08 MolecularOrbitals

L16S08 MolecularOrbitals - L 16"Molecular...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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 ...
View Full Document

This note was uploaded on 04/03/2008 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

Ask a homework question - tutors are online