91- 6303239042
Target Species Matrix: $$\begin{aligned} \text{KMnO}_4 \text{ (Potassium Permanganate):} &\quad \text{Mn}^{7+} \text{ is } d^0 \implies \text{Intense Purple color via } \text{O}^{2-} \longrightarrow \text{Mn}^{7+} \text{ LMCT} \\ \text{K}_2\text{Cr}_2\text{O}_7 \text{ (Potassium Dichromate):} &\quad \text{Cr}^{6+} \text{ is } d^0 \implies \text{Bright Orange color via } \text{O}^{2-} \longrightarrow \text{Cr}^{6+} \text{ LMCT} \\ \text{CrO}_4^{2-} \text{ (Chromate Ion):} &\quad \text{Cr}^{6+} \text{ is } d^0 \implies \text{Bright Yellow color via } \text{O}^{2-} \longrightarrow \text{Cr}^{6+} \text{ LMCT} \end{aligned}$$
Concept: Explains the intense, deep colors observed in certain transition metal complexes that possess a completely empty valence shell ($$d^0$$configuration), wherein an electron from a filled ligand orbital temporarily excites into an empty metal orbital via a light-driven internal redox mechanism.
Notation: LMCT is heavily favored when the central metal ion is in a highly positive maximum oxidation state coupled with easily oxidizable ligands ($$\text{O}^{2-}, \text{S}^{2-}$$).
