title: Inhibition in binding between fullerene and a bisporphyrin in presence of silver nanoparticles in solution: UV-Vis, DLS, SEM and TEM studies.
abstract: The present paper reports the role of silver nanoparticles, i.e., AgNp (having diameter ~5-15 nm), in non-covalent 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 (K(C60-1)=18,800 dm(3) mol(-1)) and C70-1 systems (K(C70-1)=27,300 dm(3) mol(-1)) in presence of AgNp, i.e., K(C60-1-AgNp 0=3700 dm(3) mol(-1) and K(C70-1-AgNp 0=1600 dm(3) mol(-1) for C(60)-1-AgNp and C(70)-1-AgNp nanocomposite, respectively. Dynamic light scattering study reveals considerable increase in the particle size of C(70)-1-AgNp nanocomposite, i.e., ~39 nm, compared to C(60)-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 C(70)-1-AgNp system. Transmission electron microscope study envisages formation of fibrous structure in presence of C60 and C70.
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan, India.
authors.forename: Ratul
authors.initials: R
authors.lastname: Mitra
authors.forename: Sumanta
authors.initials: S
authors.lastname: Bhattacharya
mesh_terms: D001665:Binding Sites; D037741:Fullerenes / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D011166:Porphyrins / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet
chemical_list: D037741:Fullerenes; D011166:Porphyrins; D012834:Silver
keywords: Bisporphyrin; DLS; Fullerenes C(60) and C(70); SEM; Silver nanoparticle; TEM