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Nanoaggregates of Simple Mn Porphyrin Complexes as Catalysts for the Selective Oxidation of Hydrocarbons
Author(s) -
Rezaeifard Abdolreza,
Soltani Vahideh,
Jafarpour Maasoumeh
Publication year - 2013
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201201437
Subject(s) - chemistry , tetraphenylporphyrin , porphyrin , catalysis , nanoparticle , photochemistry , dynamic light scattering , steric effects , solvent , manganese , selectivity , turnover number , ultraviolet visible spectroscopy , inorganic chemistry , organic chemistry , chemical engineering , engineering
A stable suspension of simple manganese(III) meso ‐tetraphenylporphyrin nanoaggregates was prepared by a host–guest procedure, in which ethanol and water are used as “green” solvents. The organic nanoparticles were studied by dynamic light scattering (DLS), AFM, and UV/Vis and fluorescence spectroscopy. The results indicate that the nanoaggregates have a spherical morphology with sizes between 15–40 nm. The epoxidation of olefins and oxygenation of saturated hydrocarbons by PhI(OAc) 2 were efficiently enhanced with excellent selectivity under the influence of simple Mn(TPP)OAc (TPP = meso ‐tetraphenylporphyrin) nanoparticles. Enhanced stabilities and activities were achieved with nanostructured Mn catalysts compared to those of the individual counterparts in solution according to turnover numbers and UV/Vis studies. The title nanocatalyst facilitates a greener reaction because the reaction solvent is a water/ethanol mixture and PhI(OAc) 2 is safe to use. The efficiency of the oxidation system depends critically upon the steric hindrances and electronic structures of both nitrogen donor ligands and porphyrin nanoparticles.