Transition Metal Complex Bonding and Spectroscopy Review - PowerPoint PPT Presentation

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Transition Metal Complex Bonding and Spectroscopy Review

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Count over from Group 1A size of positive charge. Ti2 : V : Co3 : Filling in Electrons. If gap is =2, then need to consider high/low spin. ... – PowerPoint PPT presentation

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Title: Transition Metal Complex Bonding and Spectroscopy Review


1
Transition Metal ComplexBonding and
SpectroscopyReview
2
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
3
Donor Acceptor MO Interactions
4
Roles Metal d-orbitals acceptors
Ligands donorsMO Diagram in general
5
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
6
(No Transcript)
7
Example Linear shape ligands at
positions 1 and 6dz2 dx2-y2 dxy
dxz dyz11 0 0
0 0
MO Diagram
8
Example Square pyramid shape ligands at
positions 1, 2, 3, 4, 5dz2 dx2-y2
dxy dxz dyz14(1/4) 4(3/4)
0 0 0
MO Diagram
9
Counting d electrons Count over from Group 1A
size of positive chargeTi2VCo3
10
Filling in Electrons
If gap is gt2, then need to consider high/low
spin. If gap is lt2, then it is always high spin.
MO Diagram examples
11
Comparing Overall Bond Order Low spin case
Oh d6 case
Square pyramid d6 case
12
Comparing Overall Bond Order High spin case
Oh d6 case
Square pyramid d6 case
13
Spectroscopy 3 types of transitions 1. d-d
transitions wavelength vs. bond
strength 2. LMCT 3. MLCT
14
Sigma Interaction Strength
15
LMCT with Pi Donor Ligands Mainly oxides and
halides
16
MLCT with Pi Acceptor Ligands and spectroscopy
CO, CN-, pyridine
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