The present article reports the supramolecular interaction between fullerenes (C60 and C70) and a designed monoporphyrin, e.g., parafluorotetraphenylporphyrin (1), in presence of silver nanoparticles (AgNp) having diameter of ~3-7 nm in toluene. UV-Vis studies reveal an interesting new physicochemical aspect. It is observed that in presence of C60 and C70 solution (in toluene), reduction in the absorbance value of the Soret band of 1 takes place; however, increase in the absorbance value of 1 occurs when the same experiment is performed in presence of silver nanoparticles. The most remarkable feature of the UV-Vis studies is that in presence of AgNp, all the species, i.e., 1, 1 + C60 and 1 + C70 mixtures, undergo first order exponential decay and the rate constant values are estimated to be 0.068, 0.084 and 0.060 min-1, respectively. Steady state fluorescence measurement reveals that reduction in the binding constant (K) value takes place for both C60-1 (K = 1065 dm3×mol-1) and C70-1 systems (K = 12585 dm3×mol-1) in presence of AgNp (KC60-1 = 890 & KC60-1 = 11975 dm3×mol-1). Conductance measurements evoke that AgNp particle reduces the magnitude of conductance value for the fullerene-1 systems in presence of AgNp. Dynamic light scattering and scanning electron microscope measurements demonstrate that the electrostatic attraction between porphyrin-based supramolecules and AgNp is very much responsible behind the formation of nanorod in case of C60-1-AgNp composite.

Investigations of antifungal activity of micron and nanoscale forms of sulfur on ten pathogenic fungi have been studied. As micronized sulfur used crushed in a roller mill, and as nanosized sulfur precipitated from a solution of sodium polysulfide. The size and shape of the particles of sulfur were characterized using a laser analyzer and probe microscope, the structure by X-ray diffractometer. Biological (antifungal) effects of sulfur particles in Sabouraud medium has been studied. It is found that in all cases, antifungal activity of nanosized sulfur with an average particle size of 25 nm, 4-9 times higher than the sulfur micron with an average particle size of 8 microns. The results can be used to create more effective than conventional sulfur ointment formulations.