An applet to display a Tanabe-Sugano diagram for octahedral d2 and tetrahedal d8 complexes should appear below.

Select the region of interest then click on the curve to get values. See the instructions for more information.

For the d2 case, the ground term is 3T1g which is plotted along the X-axis. The first spin-allowed transition is to the 3T2g level which is the red line. The other spin-allowed transitions are to the 3A2g level (drawn in green) and to 3T1g (P) level (drawn in blue) the order depending on the size of D.

For the tetrahedral d8 case, the transitions are expected at much smaller values of D/B since Dtet ~ 4/9 Doct. (The subscript g's should be dropped as well.)
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Copyright © 2003 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.
Created Feb 1999. Last modified 9th December 2003.
URL http://wwwchem.uwimona.edu.jm/courses/Tanabe-Sugano/TanSugd3.html