How do we distinguish between d-d and MLCT transistions?

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Arnaud Theodoor Sanderse

Calculate the molar extinction coefficient, this should give you a pretty good idea about whether it concerns a d-d transition or a MLCT. Look a bit into the selection rules for absorption spectroscopy

Sridhar Banerjee

Srividya Swaminathan d-d transitions are symmetry forbidden (Laporte selection rule), and therefore less intense. MLCT (or any charge transfer) transitions are far more intense. Typically, molar extinction coefficients for d-d transitions are in the range of 200-500 M-1 cm-1 whereas that for the MLCTs is >1000 M-1cm-1.