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Abstract
The acid–base chemistry of cationic 5,10,15,20‐tetrakis(1‐methyl‐4‐pyridinio)porphyrin (TMPyP) and graphene oxide (GO) complex was studied in aqueous solution using absorption and fluorescence spectroscopy. By varying the pH from 0 to 13, we controlled the electrostatic properties of TMPyP and/or GO. The neutrality on GO or negative charge on TMPyP induced the dissociation of the TMPyP/GO complex, indicating that the electrostatic attractive force is indispensable for both forming and preserving the complex. Furthermore, our results suggest that the molecular flattening of the TMPyP in the TMPyP/GO complex is mainly caused by the π–π interaction.
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