Tanabe-Sugano diagrams are used in coordination chemistry to predict electromagnetic absorptions of metal coordination compounds of tetrahedral and octahedral complexes. The analysis derived from the diagrams can also be compared to experimental spectroscopic data. When combined with spectroscopic data, an approximation to the crystal field splitting energy (10Dq), generated by ligands attached to a metal center, can be found.

The purpose of this app is to allow users to browse the different diagriams for octahedral complexes currently available and compute the value of 10Dq given specific wavelengths of transitions as well as other variables such as the B Racah Parameter. It is best used on Google Chrome

This app was inspired and built on data and prior work by Ricardo B. Ayres and Anselm Hahn

To use the app:

1. Select the first and second transistions

2. Input the energy of the transitions in wavenumbers

3. Press enter

The Matches will appear below the input fields. If more than one match is found, the second on is most likely the correct one. Multiple matches are found due to the way the algorith works by cross checking back and forth, so the first match normally has a delta/B close to zero and can be ignored.

Graphs of d4 hs, d5 hs, d6 hs are provided for reference but can also be used by hovering the mouse over a delta/B value and manually recording the appropriate values of E/B.

This app is still in development so graphs for the d4 ls, d5 ls and d6 ls have their logic programmed but still need to have the data properly cross checked. We are also fixing other bugs in the general app.