Display of spectra of Transition Metal Aquo ions and simple salts
This list will be extended as time allows....
Expected Values
The expected values should be compared to the following rough guide.
For M2+ complexes, expect Δoct =
7500 - 12500 cm-1 or ν = 800 - 1350 nm.
For M3+ complexes, expect Δoct =
14000 - 25000 cm-1 or ν = 400 - 720 nm.
Δtet ~ 4/9 Δoct.
B for first-row transition metal free ions is around 1000 cm-1.
Depending on the position of the ligand in the nephelauxetic series, this
can be reduced to as low as 60% in the complex.
Extinction coefficients for octahedral complexes are expected to be around
50-100 times smaller than for tetrahedral complexes. For a typical spin-allowed
but Laporte (orbitally) forbidden transition in an octahedral complex, expect
ε < 10 m2mol-1.
Copyright © 2006-2010 by Robert John
Lancashire, all rights reserved.
Created and maintained by Prof. Robert J.
Lancashire,
The Department of Chemistry, University of the West Indies,
Mona Campus, Kingston 7, Jamaica.