Lecture 25: Introduction to Molecular Orbital Theory The material in this lecture covers the following in Atkins. 14 Molecular structure Molecular Orbital.

Slides:

Advertisements

Similar presentations

Valence Bond Theory. What is it? Created by Linus Pauling – Go America! It is a good qualitative view of the bonding of atoms The main idea is…… Bonds.

Advertisements

Valence-bond theory. The remaining 2p orbitals cannot merge to give a bonds as they do not have cylindrical symmetry around the internuclear axis. Instead,

Chemistry 2 Lecture 1 Quantum Mechanics in Chemistry.

Problems with Valence Bond Theory

Structure and Bonding Molecular Orbital Theory Hybridization Isomerization Dipoles and Polarity.

Chapter 11 Theories of Covalent Bonding.

Lecture 23: Introduction to Valence Bond Theory The material in this lecture covers the following in Atkins. 14 Molecular structure Valence-bond theory.

1 Covalent Bonding: Orbitals Chapter The four bonds around C are of equal length and Energy.

Copyright©2000 by Houghton Mifflin Company. All rights reserved. 1 Covalent Bonding: Orbitals Chapter 09.

An amazing thing about the universe - It works in a way that sometimes when things come together, they stick… Sections Sections H H H H.

Francis A. Carey, Organic Chemistry, Fourth Edition. Copyright © 2000 The McGraw-Hill Companies, Inc. All rights reserved. Plot of potential energy versus.

1 CHEMISTRY 161 Chapter 10 Chemical Bonding II

CHEMISTRY 2000 Topic #1: Bonding – What Holds Atoms Together? Spring 2008 Dr. Susan Lait.

Introduction to molecular structure – Part I Contents: atomic orbitals - generalities models used in developing the molecular structure molecular orbital.

Simple MO Theory Chapter 5 Wednesday, October 15, 2014.

Molecular Orbital Theory

1.12 Electron Waves and Chemical Bonds. Valence Bond Theory Molecular Orbital Theory The Lewis model of chemical bonding predates the idea that electrons.

Formic acid: HCOOH Acetone.

Lecture 27: Homonuclear Diatomic Molecules-II The material in this lecture covers the following in Atkins. 14 Molecular structure Molecular Orbital Theory.

Atomic Orbitals: A Quantum Mechanical Description of Electrons around the Nucleus 1-6 The electron is described by wave equations. An electron within an.

Chemistry 445. Lecture 3. Molecular Orbital Theory.

Molecular orbital theory Overcoming the shortcomings of the valence bond.

Medical Chemistry (1) 1433 – 1434 H. Carbon Compounds.

MODULE 11 Diatomic Molecules and Beyond Our next task is to extend the procedures and ideas that we have developed for H 2 + to larger molecules. The track.

Atoms are bonded together by electrons, but what is a bond? A bond forms when two atomic orbitals overlap to make a molecule more stable than when there.

Energy level diagram EA -  EA +  B A .

Chapter 10 Chemical Bonding II. Valence Bond Theory Valence Bond Theory: A quantum mechanical model which shows how electron pairs are shared in a covalent.

Molecular structure The Schrödinger Equation for molecules The Born-Oppenheimer approximation 4.1 Molecular orbital theory The hydrogen molecule-ion.

MOLECULAR STRUCTURE CHAPTER 14 Experiments show O 2 is paramagnetic.

Atomic QM to Molecular QM ( ) Solution of SE for molecules is more complicated due to much larger number of electrons and multiple nuclei – SE.

June 10, 2009 – Class 37 and 38 Overview

Molecular Orbitals An overview. MO Theory Robert Mullikan won the Nobel Prize in 1966 for developing this theory. This theory describes the electrons.

Lecture 2 Chemical Bonds: Atomic Orbital Theory and Molecular Orbital Theory Dr. A.K.M. Shafiqul Islam

Molecular Orbital Theory Molecular Orbitals Just as atomic orbitals belong to a particular atom, a molecular orbital belongs to molecules as a whole.

Why do bonds form? Energy of two separate H atoms Lennard-Jones potential energy diagram for the hydrogen molecule. Forces involved: We understand that.

Molecular Orbitals in Chemical Bonding

Two Bonding Theories Valence Bond Theory (localized electron model) –Electrons in a molecule still occupy orbitals of individual atoms. Molecular Orbital.

CHEMISTRY 2000 Topic #1: Bonding – What Holds Atoms Together? Spring 2008 Dr. Susan Lait.

Lecture 24: Applications of Valence Bond Theory The material in this lecture covers the following in Atkins. 14 Molecular structure Valence-bond theory.

1.12 Electron Waves and Chemical Bonds. Models for Chemical Bonding Valence Bond Theory Molecular Orbital Theory The Lewis model of chemical bonding predates.

Lecture 8. Chemical Bonding

1 Tentative content material to be covered for Exam 2 (Wednesday, November 2, 2005) Chapter 16Quantum Mechanics and the Hydrogen Atom 16.1Waves and Light.

Chemistry 445. Lecture 3. Molecular Orbital Theory.

Molecular Orbital Theory Molecular orbital theory describes covalent bonds in terms of molecular orbitals, which result from interaction of the.

Review of VB and MO theory

Structure and Properties of Organic Molecules

Quantum Mechanical Description of Molecules Glenn V. Lo Department of Physical Sciences Nicholls State University.

Introduction to Molecular Orbital Theory.

Chemistry 120 Molecular Structure Both atoms and molecules are quantum systems We need a method of describing molecules in a quantum mechanical way so.

Struktur Molekul Teori Ikatan Valensi.

Lecture 2 Chemical Bonds: Atomic Orbital Theory and Molecular Orbital Theory Dr. A.K.M. Shafiqul Islam

Molecular Orbital Theory

9.4 Covalent Bonding and Orbital Overlap

Molecular Orbital Theory

Chemistry 445. Lecture 3. Molecular Orbital Theory.

18.1 Electron Waves and Chemical Bonds

Sigma (s) and Pi Bonds (p)

Chemical Bonding II: Molecular Geometry and Hybridization of Atomic Orbitals Chapter 9 Copyright © The McGraw-Hill Companies, Inc. Permission required.

Hamiltonian for the H atom

X y z (1s + 1s) σ.

Introduction to Molecular Orbital Theory

Hybrid Orbitals Consider beryllium:

Chapter 1B Carbon Compounds and Chemical Bonds

Molecular Orbital Theory

Organic Chemistry Second Edition Chapter 1 David Klein

Covalent Bonding: Orbitals

Figure 1. 1: The position of carbon in the periodic table

Molecular Orbital Theory

Bonding & Molecular Structure:

P.G Department of Chemistry Govt. P.G College Rajouri

Presentation transcript:

Lecture 25: Introduction to Molecular Orbital Theory The material in this lecture covers the following in Atkins. 14 Molecular structure Molecular Orbital Theory (a) Linear combinations of atomic orbitals (b) bonding orbitals (c) anti-bonding orbitals Lecture on-line Introduction to Molecular Orbital theory (PowerPoint) Introduction to Molecular Orbital Theory (PDF) Handout for this lecture

(a)The amplitude of the bonding molecular orbital in a hydrogen molecule-ion in a plane containing the two nuclei and (b) a contour representation of the amplitude.

A representation of the constructive interference that occurs when two H 1s orbitals overlap and form a bonding  orbital. Compare this illustration with Fig

The boundary surface of a  orbital encloses the region where the electrons that occupy the orbital are most likely to be found. Note that the orbital has cylindrical symmetry.

The electron density calculated by forming the square of the wavefunction used to construct Fig Note the accumulation of electron density in the internuclear region.

The calculated and experimental molecular potential energy curves for a hydrogen molecule-ion.

A representation of the destructive interference that occurs when two H1s orbitals overlap and form an antibonding  * orbital. Compare this illustration with Fig

(a) The amplitude of the antibonding molecular orbital in a hydrogen molecule-ion in a plane containing the two nuclei and (b) a contour representation of the amplitude. Note the internuclear node.

The electron density calculated by forming the square of the wavefunction used to construct Fig Note the elimination of electron density from the internuclear region.

(b) In an antibonding orbital, the nuclei are attracted to an accumulation of electron density outside the internuclear region. A partial explanation of the origin of bonding and antibonding effects. (a) In a bonding orbital, the nuclei are attracted to the accumulation of electron density in the internuclear region.

A molecular orbital energy level diagram for orbitals constructed from the overlap of H1s orbitals; the separation of the levels corresponds to that found at the equilibrium bond length. The ground electronic configuration of H 2 is obtained by accommodating the two electrons in the lowest available orbital (the bonding orbital).