Porphyrin synthesized from cashew nut shell liquid as part of a novel superparamagnetic fluorescence nanosystem
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Magnetic Fe3O4 nanoparticles with average size approximately 11 nm were first oleic acid coated to interact with the meso-porphyrin derivative from CNSL. This procedure produced a novel superparamagnetic fluorescent nanosystem (SFN) linked by van der Waals interactions. This system was characterized by transmission electron microscope, infrared spectroscopy, thermogravimetric analysis, magnetic measurements, UV–Vis absorption, and fluorescence emission measurements. These results showed that SFN has good thermal stability, excellent magnetization, and nanosized dimensions (~13 nm). It exhibited emission peaks at 668 and 725 nm with a maximum emission at 467 nm of excitation wavelength. The type of interaction between porphyrin and magnetic nanoparticles allowed to obtain a material with interesting optical properties which might be used as an imaging agent for contrast in cells as well as heterogeneous photocatalysis.
KeywordsFluorescent nanosystem Magnetic nanoparticles Cardanol Porphyrin
The study was supported by the CAPES, Funcap and CNPq (Brazilian agencies), Financiamiento Basal para Centros Cientificos y Tecnologicos de Excelencia CEDENNA), the Millennium Science Nucleus Basic and Applied Magnetism (P06-022F), and Fondecyt 1080164 and 3100117. The authors thank Prof. Antonio G. Souza Filho for valuable discussions.
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