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As a collaboration with Rajas Ketkar (an excellent student in my inorganic chemistry class), we now have an online tool that you can use to "pull" a vertical line across each Tanabe-Sugano diagram and read off the intersecting E/B values. This should make the process easier and more intuitive for students. Please credit Rajas when using in your classes!
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This is an excellent resource. I will be using this website in my class. I appreciate very much that the lines are color coded for easy reading.
What a great web page! I will definitely have students use it in my class.
I do have one suggestion, but I am not sure how difficult this would be to implement. When determining delta from spectroscopic data, we often look at the ratio of the energies of the two lowest energy transitions. Would it be possible to add that to this tool? For instance, in the tool we see that for a d6 metal ion the energies are shown below.
¹A₁(I): E/B =0.0
¹T₁(I): E/B =22.3
¹T₂(I): E/B =34.5
The lowest energy transition would be 1A1 to 1T1 with an E/B of 22.3 and the second lowest energy transition would be 1A1 to 1T2 with an E/B of 34.5, resulting in a ratio of energies equal to 1.55. This is the value that we would match to energies from UV-visible spectra. Having this additional piece of information would be great.