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The porphyrin-stoppered rotaxane was prepared from dibenzo-24-crown-8 (DB24C8) and the secondary ammonium ion derivative end-capped by the axial coordination of rhodium(III) tetra-(3,5-di-tert-butylphenyl) porphyrin [TBPP Rh(III) Cl]. This rotaxane molecule was designed aiming at the immobilization on a substrate and the analysis of the physicochemical properties as a single molecule.
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Asakawa et al. (2002) studied this question.
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