If you like us, please share us on social media.
The latest UCD Hyperlibrary newsletter is now complete, check it out.

GeoWiki.png
ChemWiki: The Dynamic Chemistry E-textbook > Wikitexts > UC Davis > UCD Chem 124A: Kauzlarich > ChemWiki Module Topics > Molecular Orbital Theory applied to CH4

MindTouch
Copyright (c) 2006-2014 MindTouch Inc.
http://mindtouch.com

This file and accompanying files are licensed under the MindTouch Master Subscription Agreement (MSA).

At any time, you shall not, directly or indirectly: (i) sublicense, resell, rent, lease, distribute, market, commercialize or otherwise transfer rights or usage to: (a) the Software, (b) any modified version or derivative work of the Software created by you or for you, or (c) MindTouch Open Source (which includes all non-supported versions of MindTouch-developed software), for any purpose including timesharing or service bureau purposes; (ii) remove or alter any copyright, trademark or proprietary notice in the Software; (iii) transfer, use or export the Software in violation of any applicable laws or regulations of any government or governmental agency; (iv) use or run on any of your hardware, or have deployed for use, any production version of MindTouch Open Source; (v) use any of the Support Services, Error corrections, Updates or Upgrades, for the MindTouch Open Source software or for any Server for which Support Services are not then purchased as provided hereunder; or (vi) reverse engineer, decompile or modify any encrypted or encoded portion of the Software.

A complete copy of the MSA is available at http://www.mindtouch.com/msa

Molecular Orbital Theory applied to CH4

This module seeks to explain the bonding of the 4 Hydrogen atoms to the 1 Carbon atom in the molecule CH4 (methane),using the molecular orbital theory. Molecular orbital theory describes orbitals that are formed with the interaction of the atomic orbitals of given atoms. These orbitals are spread out over the entire molecule and electrons fill these orbitals in accordance with the aufbau principle.

Introduction

Various concepts explain the molecular orbital theory in the bonding in methane, including character tables,  symmetry, LGOs (ligand group orbital approach), and a qualitative MO diagram.

The Symmetry of CH4

  • CH4 belongs to the Td point group and contains: 8C3 axes, 3C2 axes, 6S4 axes, and a dihedral plane of symmetry. Using the character table for the Td point group,

 

Character Table for Td Point group

Td E 8C3 3C2 6S4 6sigmad
A1 1 1 1 1 1
A2 1 1 1 -1 -1
E 2 -1 2 0 0
T1 3 0 -1 1 -1
T2 3 0 -1 -1 1


Molecular Orbital Diagram for CH4

 

Rename to desired sub-topic. You can delete the header for this section and place your own related to the topic. Remember to hyperlink your module to other modules via the link button on the editor toolbar.

References

  1. Housecroft, C; Sharpe, A. (2008). Bonding in Polyatomic Molecules. In: Pearson Education Limited Inorganic Chemistry. Edinburgh Gate: Pearson Education Limited. pgs. 33, 130-131.

Outside Links

  • This is not meant for references used for constructing the module, but as secondary and unvetted information available at other site
  • Link to outside sources. Wikipedia entries should probably be referenced here.

Problems

What are ligand group orbitals, and how are they used in MO theory in polyatomic molecules?

How many Vibrational modes and IR/Ramen stretches are there in CH4?

What are the major differences between VB theory and MO theory applied to polyatomic molecules?

 

Contributors

  • Name #1 here (if anonymous, you can avoid this) with university affiliation

You must to post a comment.
Last Modified
10:16, 2 Oct 2013

Tags

Classifications

(not set)
(not set)

Creative Commons License Unless otherwise noted, content in the UC Davis ChemWiki is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 United States License. Permissions beyond the scope of this license may be available at copyright@ucdavis.edu. Questions and concerns can be directed toward Prof. Delmar Larsen (dlarsen@ucdavis.edu), Founder and Director. Terms of Use