The present paper reports the role of silver nanoparticles, i.e., AgNp (having diameter 5–15 nm), in noncovalent
interaction between fullerenes (C60 and C70) and a designed bisporphyrin (1) in toluene. UV–Vis
measurement reveals reduction in binding constant (K) values for both C60-1 (KC60-1 = 18,800 dm3 mol1)
and C70-1 systems (KC70-1 = 27,300 dm3 mol1) in presence of AgNp, i.e., KC60-1-AgNp = 3700 dm3 mol1 and
KC70-1-AgNp = 1600 dm3 mol1 for C60-1-AgNp and C70-1-AgNp nanocomposite, respectively. Dynamic light
scattering study reveals considerable increase in the particle size of C70-1-AgNp nanocomposite, i.e.,
39 nm, compared to C60-1-AgNp, e.g., 22 nm. Scanning electron microscope measurement reveals that
the well arranged and composed structure of uncomplexed 1 is perturbed very much in presence of both
C60 and C70, and it ultimately results into formation of nanoaggregate in case of C70-1-AgNp system.
Transmission electron microscope study envisages formation of fibrous structure in presence of C60
and C70.