کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1234434 | 1495272 | 2012 | 8 صفحه PDF | دانلود رایگان |
The present article reports on supramolecular interaction between fullerenes (C60 and C70) 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 C60−1 (K = 1560 dm3 mol−1) and C70−1 systems (K = 14,970 dm3 mol−1) in presence of AgNp, i.e., K C60−1 = 1445 dm3 mol−1 and Kc60−1 = 14,550 dm3 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 C60 and C70 molecule with the flat -belt region of 1.
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► Fullerene-porphyrin complexation is examined in presence of silver nanoparticles.
► Silver nanoparticles (AgNp) inhibit binding between fullerene and porphyrin (1).
► DLS study reveals larger size particles of AgNp in presence of fullerene-1 complex.
► SEM measurements establish formation of surface holes in fullerene-1-AgNp structure.
► Electrostatic attraction between porphyrin-based supramolecule and AgNp is observed.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 96, October 2012, Pages 485–492