Inhibition in binding between fullerene and bisporphyrin in presence of silver nanoparticles: A new physicochemical insight into fullerene–bisporphyrin complexation in solution

Abstract

The present paper reports non-covalent interaction between fullerenes (C60 and C70) and a designed bisporphyrin (1) in p-xylene in absence and presence of silver nanoparticles (AgNp) having diameter ∼5–15nm. Both UV–vis and fluorescence experiments reveal reduction in the average binding constant (Kav) value for C60-1 (KC60-1=27,980dm3mol−1) and C70-1 systems (KC70-1=115,020dm3mol−1) in presence of AgNp, i.e., KC60-1-AgNp=22,465dm3mol−1 and KC70-1-AgNp=30,830dm3mol−1. Dynamic light scattering experiment gives clear indication regarding formation of larger aggregates as a result of electrostatic attraction between porphyrin-based supramolecule and AgNp in solution. Scanning electron microscope measurement reveals formation of molecular cluster comprising C70-1-AgNp composite.