'Bonding orbitals' diaporamas de présentation

Molecular Structure

Molecular Structure. Both atoms and molecules are quantum systems We need a method of describing molecules in a quantum mechanical way so that we can predict structure and properties The method we use is the Linear Combination of Atomic Orbitals

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Chapter 11 Arenes and Aromaticity

Chapter 11 Arenes and Aromaticity. CH 3. H. H. H. H. H. H. H. H. H. H. H. H. H. H. H. H. H. H. H. Examples of Aromatic Hydrocarbons. Benzene. Toluene. Naphthalene. Another Example of an Aromatic Hydrocarbon. Common source: gum benzoin tree. Methyl paraben.

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Arenes and Aromaticity ( Benzene )

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11.18 Polymerization of Styrene

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11.18 Cyclobutadiene and Cyclooctatetraene

11.18 Cyclobutadiene and Cyclooctatetraene. Requirements for Aromaticity. cyclic conjugation is necessary, but not sufficient. not aromatic. not aromatic. aromatic. Heats of Hydrogenation. to give cyclohexane (kJ/mol).

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Valence Bond And Molecular Orbital Theories Overview

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Energy level diagram

?. ? B. ? A. ?. E A + ?. Energy level diagram. E A - ?. Linear combination of atomic orbitals. Rules for linear combination. 1. Atomic orbitals must be roughly of the same energy.

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Experimental characterization of simple single-molecule junctions

Experimental characterization of simple single-molecule junctions. In collaboration with. Kamerlingh Onnes Laboratory, Leiden University. Leiden: Marc van Hemert IBM Yorktown Heights: Norton Lang Technical University of Denmark: Kristian Thygesen, Karsten Jacobsen.

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Conjugated systems (continued )

Conjugated systems (continued ). Dr. Sheppard CHEM 4201. Outline. Structure Reactions MO Theory UV Spectroscopy. III. Molecular orbital theory. Sigma bonding Electron density lies between the nuclei Formed from overlap of hybrid orbitals

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Molecular Structure

Molecular Structure. Both atoms and molecules are quantum systems We need a method of describing molecules in a quantum mechanical way so that we can predict structure and properties The method we use is the Linear Combination of Atomic Orbitals

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Sigma ( s ) and pi ( ? ) bonding in C 2 H 4

Sigma ( s ) and pi ( ? ) bonding in C 2 H 4. FIGURE 11-14. Class examples.

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Molecular Modeling

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????? ?????? ?????? ?? ???????? ?????????? (???????? ????????? )

????? ?????? ?????? ?? ???????? ?????????? (???????? ????????? ). The type and nature of bonding in chemical compounds . (coordination compounds). ?.?. ???? ??? ?????? ????. ????? ?????? ?????? ?? ???????? ?????????? ) ???????? ????????? (. ?????? ???????? (Covalent bonding) .

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Energy of 3 ? bonding orbitals lower than energy of 2p (isolated)

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Molecular Orbital Theory

Molecular Orbital Theory. Atomic orbitals mix together and make: Bonding Orbitals Electrons in these orbitals help hold atoms near each other Antibonding Orbitals Electrons in these orbitals push atoms apart from each other Nonbonding Orbitals

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Molecular Orbital Energy Diagrams (16.7)

Molecular Orbital Energy Diagrams (16.7). MO energy diagrams are useful in that they show how atomic orbitals from different atoms may combine to molecular orbitals Sigma bonds form from s- and p-orbitals, pi bonds from p-orbitals

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Aromatic Compounds

Aromatic Compounds. 1. Discovery of Benzene. Isolated in 1825 by Michael Faraday who determined C:H ratio to be 1:1. Synthesized in 1834 by Eilhard Mitscherlich who determined molecular formula to be C 6 H 6 .

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UV-VIS Spectroscopy

UV-VIS Spectroscopy. By Dr.Jagadeesh. Introduction. UV-VIS spectroscopy deals with electronic excitations and de-excitations of atoms and molecules The UV region corresponds to 200nm -400nm Energy corresponding to this region is 150-72 kcal / mole

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Lecture 17 Molecular Orbital Theory 1) Molecular Orbitals of AH x (x = 3, 4, 6)

Lecture 17 Molecular Orbital Theory 1) Molecular Orbitals of AH x (x = 3, 4, 6). MO diagrams can be used on a qualitative basis to understand the shape of molecules of the same stoichiometry (same x) but formed with different central atoms A (most commonly, should belong to the same period)

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