Synthesis and characterization of Piperidine-4-carboxylic acid functionalized Fe 3O 4 nanoparticles as a magnetic catalyst for Knoevenagel reaction
2012 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 47, no 9, 2480-2486 p.Article in journal (Refereed) Published
Piperidine-4-carboxylic acid (PPCA) functionalized Fe 3O 4 nanoparticles as a novel organic-inorganic hybrid heterogeneous catalyst was fabricated and characterized by XRD, FT-IR, TGA, TEM and VSM techniques. Composition was determined as Fe 3O 4, while particles were observed to have spherical morphology. Size estimations using X-ray line profile fitting (10 nm), TEM (11 nm) and magnetization fitting (9 nm) agree well, revealing nearly single crystalline character of Fe 3O 4 nanoparticles. Magnetization measurements reveal that PPCA functionalized Fe 3O 4 NPs have superparamagnetic features, namely immeasurable coercivity and absence of saturation. Small coercivity is established at low temperatures. The catalytic activity of Fe 3O 4-PPCA was probed through one-pot synthesis of nitro alkenes through Knoevenagel reaction in CH 2Cl 2 at room temperature. The heterogeneous catalyst showed very high conversion rates (97%) and could be recovered easily and reused many times without significant loss of its catalytic activity.
Place, publisher, year, edition, pages
2012. Vol. 47, no 9, 2480-2486 p.
A. Magnetic materials, B. Chemical synthesis, C. X-ray diffraction, D. Catalytic properties, D. Magnetic properties
IdentifiersURN: urn:nbn:se:kth:diva-101342DOI: 10.1016/j.materresbull.2012.05.015ISI: 000309081400058ScopusID: 2-s2.0-84864626031OAI: oai:DiVA.org:kth-101342DiVA: diva2:547850
QC 201208292012-08-292012-08-272012-11-06Bibliographically approved