Study of non-covalent interaction between a designed monoporphyrin and fullerenes (C60 and C70) in absence and presence of silver nanoparticles.
The present article reports on supramolecular interaction between fullerenes (C(60) and C(70)) and a designed monoporphyrin, e.g., 5,15-di(para-methoxyphenyl)zincporphyrin (1), in absence and presence of silver nanoparticles (AgNp) having diameter of ~3-7 nm in toluene. While UV-Vis studies establish the ground state electronic interaction between fullerenes and 1 in absence and presence of AgNp, steady state fluorescence experiment enables us to determine the value of binding constant (K) for the fullerene-1 complexes in solution. Steady state fluorescence measurement reveals that reduction in the K value takes place for both C(60)-1 (K=1560 dm(3) mol(-1)) and C(70)-1 systems (K=14,970 dm(3) mol(-1)) in presence of AgNp, i.e., K C(60)(-1)=1445 dm(3) mol(-1) and Kc(60-)(1)=14,550 dm(3) mol(-1). SEM measurements establish formation of surface holes in fullerene-1-AgNp structure. Both SEM and dynamic light scattering measurement demonstrates that the electrostatic attraction between porphyrin-based supramolecules and AgNp is very much responsible behind the formation of larger aggregates. Quantum chemical calculations evoke the single projection geometric structures of the fullerene-1 complexes in vacuo and well interpret the alignment of the C(60) and C(70) molecule with the flat -belt region of 1.
Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713 104, India.
Ratul
R
Mitra
Ajoy K
AK
Bauri
Sumanta
S
Bhattacharya
D000042:Absorption; D004553:Electric Conductivity; D037741:Fullerenes / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D008027:Light; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D008968:Molecular Conformation; D010316:Particle Size; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism*; D012542:Scattering, Radiation; D012834:Silver / Q000737:chemistry / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
D037741:Fullerenes; D011166:Porphyrins; D012834:Silver