L16S10_Covalent+Bonding,+MolecularOrbitals+02-26-10

L16S10_Covalent+Bonding,+MolecularOrbitals+02-26-10 - L 16:...

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Unformatted text preview: L 16: "Molecular Orbitals" 16: Polymerization -A-B-A-B-A-BPolymerization H H H-N-(CH2)6-N-H Molecules of the same formula with different Molecules arrangements of the atoms a rrangements Isomers Summary = A O O Cl-C-(CH2)8-C-Cl = Sebacoyl Chloride 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 Hexamethylene diamine .. © A.Pines,M.Kubinec,UCB .... L5-10 HH H-C-O-C-H HH -© A.Pines,M.Kubinec,UCB C=C Cl H L6-10 Chiral Molecules Chiral Molecules Alanine N C C O O C O O N C C C Left-handed handed DNA Helix DNA L D © 2004 M. Kubinec, A. Pines © A.Pines,M.Kubinec,UCB Right-handed handed DNA Helix DNA L16-1 L5-9 Non Non Superimposable Mirror Images 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 Left-handed DNA DNA Helix © 2004 M. Kubinec, A. Pines L D Right-handed Right-handed DNA DNA Helix L15-3 © 2004 M.Kubinec, A. Pines 1 L 16: "Molecular Orbitals" 16: ChemQuiz© 15.3 Which Which of the following structural structural isomers of isomers of octane is chiral? chiral? CH2 CH3 C C CH2 CH2 C-C CH2 CH2 CH3 CH2 - - C - C - C - A) A) C-C-C-C-C © 2004 M. Kubinec, A. Pines B) B) C-C-C-C-C C) C) C-C-C-C - - - - C C C L15-4 Summary © 2004 M. Kubinec, A. Pines L16-6 Covalent Bonding, Molecular Orbitals + + * Bonding Bonding *Antibonding H 1s H2 1s 1s H paramagnetic diamagnetic L16-7 © 2004 M. Kubinec, A. Pines © 2004 M.Kubinec, A. Pines 2 L 16: "Molecular Orbitals" 16: BOND ORDER (BO) BO BO = # bonding e- - # antibonding ebonding 2 © 2004 M. Kubinec, A. Pines L16-8 Covalent Bonding, Molecular Orbitals + + * Bonding Bonding * Antibonding Li2 Be2 * (2s) (2s) He 1s He2 1s 1s He (2s) (2s) L16-9 © 2004 M. Kubinec, A. Pines ChemQuiz© 16.1 Which Which of the following diatomic species diatomic species becomes more stable upon ionization? A) A) H2 © 2004 M. Kubinec, A. Pines e- B) B) He2 C) C) Li2 L16-10 © 2004 M.Kubinec, A. Pines 3 L 16: "Molecular Orbitals" 16: Three Three Mutually Perpendicular 2p orbitals on Two Adjacent Boron Atoms z y x x z y Signs Signs indicate orbital orbital phases pz pz © 2004 M. Kubinec, A. Pines px px py py L16-12 The Orbitals The p Orbitals Overlap to Bonding and Antibonding Antibonding Orbitals 2p 2py 2py 2pz 2py 2py Signs Signs indicate indicate orbital phases phases © 2004 M. Kubinec, A. Pines L16-13 Sigma, Pi bonding + * * * + * x * z 2px 2pz x z L16-14 2py 2py 2px 2pz 2p © 2004 M. Kubinec, A. Pines © 2004 M.Kubinec, A. Pines 4 L 16: "Molecular Orbitals" 16: MO Bond Descriptions B2 Order Type C2 2 N2 3 O2 2 F2 1 Ne2 0 * * 1 * * © 2004 M. Kubinec, A. Pines L16-15 An An Apparatus used to Measure the the Paramagnetism of a Sample © 2004 M. Kubinec, A. Pines L16-16 ChemQuiz© 16.2 Consider ionization and and electron electron capture in N2. in Which is true of the bond bond strengths of the products? N N e- N N - e- N A) A) N2 > N2 © 2004 M. Kubinec, A. Pines N+ - + - B) B) N2 ~ N2 + - C) C) N2 < N2 L16-17 + © 2004 M.Kubinec, A. Pines 5 L 16: "Molecular Orbitals" 16: ChemQuiz ChemQuiz© 16.3 Which Which process involving a photon is photon is responsible for the conversion of triplet singlet O2 triplet to O2 singlet ? O2 (triplet) paramagnetic paramagnetic O2 (singlet) diamagnetic diamagnetic A) A) absorption B) emission C) ionization emission C) 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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