Abstract
A combination of π–π stacking and electrostatic interactions was used to integrate an anionic porphyrin (H 2P 2−) with carbon nanohorns (CNHs), mediated by positively charged pyrene (pyr +) units. The resulting water-soluble CNHs–pyr +–H 2P 2− nanoensemble was characterized by optical spectroscopy and electron microscopy techniques. The strong fluorescence emission of H 2P 2− was significantly quenched by CNHs, suggesting effective energy and electron transfer between the photo-excited porphyrin and the extended π-electronic network of nanohorns. Blank experiments validated the supramolecular concept of synergistic electrostatic interactions and signified the importance of CNHs as electron acceptors towards the preparation of some novel donor-acceptor nanosystems.
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