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• W2091218623 abstract "The complexes of Fe(II) were synthesized with the azamacrocyclic ligands; [12]aneN4: 1,4,7,10-tetraazacyclododecane-2,3,8,9-tetraone; [14]aneN4: 1,4,8,11-tetraazacyclotetradecane-2,3,9,10-tetraone; Bzo2[12]aneN4: dibenzo-1,4,7,10-tetraazacyclododecane-2,3,8,9-tetraone and Bzo2[14]aneN4: dibenzo-1,4,8,11-tetraazacyclotetradecane-2,3,9,10-tetraone. Iron(II) complexes with azamacrocyclic ligand were entrapped in the nanocavity of zeolite-Y by a two-step process in the liquid phase: (i) adsorption of bis(diamine)iron(II); in the supercages of the zeolite, and (ii) in situ condensation of the iron(II) precursor complex with diethyloxalate. The new nanocomposite materials were characterized by several techniques: chemical analysis, spectroscopic methods (DRS, BET, FTIR and UV/vis). Analysis of the data indicated that the Fe(II) complexes were encapsulated in the nanodimensional pores of zeolite-Y and exhibited different from those of the free complexes, which can arise from distortions caused by steric effects due to the presence of sodium cations, or from interactions with the zeolite matrix. The encapsulated nanomaterials are active catalyst for the epoxidation of styrene using molecular oxygen as an oxidant. By comparing the performance of the heterogeneous system with the free complex in the oxidation of styrene using O2, protection effect of the matrix over the active center was evidenced by a higher conversion and yield of products." @default.
• W2091218623 created "2016-06-24" @default.
• W2091218623 creator A5083543950 @default.
• W2091218623 date "2007-12-01" @default.
• W2091218623 modified "2023-09-28" @default.
• W2091218623 title "Synthesis, characterization and catalytic epoxidation of styrene using molecular oxygen over “neat” and host–guest nanocomposite materials" @default.
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• W2091218623 doi "https://doi.org/10.1016/j.molcata.2007.08.019" @default.
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