title: Photophysical insights on effect of gold nanoparticles over fullerene-porphyrin interaction in solution.
abstract: The present article reports the role of gold nanoparticles, i.e., AuNp (having diameter ∼2-4nm), in non-covalent interaction between fullerenes (C60 and C70) and a monoporphyrin (1) in toluene. Both UV-vis and fluorescence measurements reveal considerable reduction in the average value of binding constant (Kav) for the C70-1 system (KC70-1(av)=19,300 dm3 mol(-1)) in presence of AuNp, i.e., KC70-1-AuNp(av)=13,515 dm3 mol(-1) although no such phenomenon is observed in case of C60-1 system, viz., KC60-1(av)=1445 dm3 mol(-1) and KC60-1-AuNp(av)=1210 dm3 mol(-1). DLS study reveals sizeable amount of increase in the particle size of C70-1-AuNp nanocomposite, i.e., ∼105 nm, compared to C60-1-AgNp system, e.g., ∼5.5 nm which gives very good support in favor of decrease in the value of Kav for the former system. SEM study reveals that nanoparticles are dispersed in larger extent in case of C70-1-AuNp system. Time-resolved fluorescence study envisages that deactivation of the excited singlet state of 1 by C70 takes place at a faster rate in comparison to C60 in presence of gold nanoparticles.
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713 104, India.
authors.forename: Ratul
authors.initials: R
authors.lastname: Mitra
authors.affiliation: Bio-Organic Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Ajoy K
authors.initials: AK
authors.lastname: Bauri
authors.affiliation: Department of Chemistry, Raja Rammohun Roy Mahavidyalaya, Radhanagore, Hooghly 712 406, India. Electronic address: shrabanti_05@rediffmail.com.
authors.forename: Shrabanti
authors.initials: S
authors.lastname: Banerjee
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713 104, India. Electronic address: sum_9974@rediffmail.com.
authors.forename: Sumanta
authors.initials: S
authors.lastname: Bhattacharya
mesh_terms: D037741:Fullerenes / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D007700:Kinetics; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D017785:Photons; D011166:Porphyrins / Q000737:chemistry*; D012542:Scattering, Radiation; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
chemical_list: D037741:Fullerenes; D011166:Porphyrins; D012996:Solutions; D006046:Gold
keywords: Binding constant; DLS; Fullerenes C(60) and C(70); Gold nanoparticle; Monoporphyrin; SEM