lecture 6 - The next two parts of the course are closely...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
1 The next two parts of the course are closely related, though at first it may not seem so.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
What we hope to answer How to recognize if a molecule is chiral What vibrational modes in a molecule are IR or Raman active (visible) How to predict the molecular orbital energy levels based on atomic orbitals, without doing a lot of math 2
Background image of page 2
H N H H Cl Ru Cl Cl Cl Cl Cl Which is more symmetrical? pyramidal trigonal planar Square planar octahedral Chapter 6 Molecular Symmetry
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
…….although you might have an intuitive sense as to which of these molecules is most symmetrical, the answer can be succinctly described using formalized rules, by determining the molecular point group …... Knowledge of a molecule s point group , i.e., symmetry, allows you to: • construct a molecular orbital (MO) diagram •predict the number of unpaired electrons •predict the number of IR stretches ………. .etc.
Background image of page 4
H N H H Cl Ru Cl Cl Cl Cl Cl Which is more symmetrical? Which is more symmetrical? C 3v ( 5 symmetry elements ) D 3h ( 10 symmetry elements ) D 4h ( 14 symmetry elements ) O h ( 31 symmetry elements ) Point group associated symmetry elements the more symmetrical molecules the more symmetrical molecules possess more symmetry elements possess more symmetry elements
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Group theory is a mathematical analytic method that describes the relationship between geometrical objects and operations performed on them. A mathematical group consists of a set of operations that, in combination on an object, do not result in changes to the object. Thus these operations can be referred to as symmetry elements .
Background image of page 6
In order to be able to do this, we ll need to know
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/19/2012 for the course CHEM 312 taught by Professor Staff during the Summer '08 term at University of Washington.

Page1 / 36

lecture 6 - The next two parts of the course are closely...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online