Transition metal complex bonding and spectroscopy review
This presentation is the property of its rightful owner.
Sponsored Links
1 / 16

Transition Metal Complex Bonding and Spectroscopy Review PowerPoint PPT Presentation


  • 67 Views
  • Uploaded on
  • Presentation posted in: General

Transition Metal Complex Bonding and Spectroscopy Review.

Download Presentation

Transition Metal Complex Bonding and Spectroscopy Review

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Transition Metal ComplexBonding and SpectroscopyReview


Bonding:Donor-Acceptor Interactions Roles of metal and ligands Making MO Diagrams for Complexes Counting d-electrons Filling in the MO Diagram High spin/Low spin cases Comparing structures for bond strength


Donor Acceptor MO Interactions


Roles: Metal d-orbitals = acceptors Ligands = donorsMO Diagram in general:


Specific Interactions for each d orbital based on ligand position

Use Angular Overlap parameters:

--for each d-orbital, add up the interactions for all the ligands

-- the total for that orbital determines how much higher its energy gets


Example: Linear shape: ligands at positions 1 and 6dz2 dx2-y2dxydxzdyz1+1 0 0 0 0

MO Diagram:


Example: Square pyramid shape: ligands at positions 1, 2, 3, 4, 5dz2 dx2-y2dxydxzdyz1+4(1/4) 4(3/4) 0 0 0

MO Diagram:


Counting d electrons: Count over from Group 1A – size of positive chargeTi2+:V+:Co3+:


Filling in Electrons

If gap is >=2, then need to consider high/low spin.

If gap is <2, then it is always high spin.

MO Diagram examples:


Comparing Overall Bond Order: Low spin case

Square pyramid d6 case:

Oh d6 case:


Comparing Overall Bond Order: High spin case

Square pyramid d6 case:

Oh d6 case:


Spectroscopy: 3 types of transitions 1. d-d transitions wavelength vs. bond strength 2. LMCT 3. MLCT


Sigma Interaction Strength


LMCT with Pi Donor Ligands: Mainly oxides and halides


MLCT with Pi Acceptor Ligands and spectroscopy: CO, CN-, pyridine


  • Login