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(a) Schematic illustration of sequence of lithiation/de-lithiation mechanism in the purpurin molecule: (1) Molecular structure of pristine purpurin; (2) Intermediate of lithiated purpurin, and (3) Binding of lithium ion with carbonyl and hydroxyl groups of purpurin at C-1 (–OHa) and C-4 (–OHc) respectively. (b) Photograph of (1) pristine purpurin and (2) Chemically lithiated purpurin (1:2 ratio).
