The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Cu(II)-amino acid–CaAl-layered double hydroxide complexes, recyclable, efficient catalysts in various oxidative transformations

På svenska

Author

  • Gábor Varga
  • Szilveszter Ziegenheim
  • Szabolcs Muráth
  • Zita Csendes
  • Ákos Kukovecz
  • Zoltán Kónya
  • Stefan Carlson
  • László Korecz
  • Erika Varga
  • Péter Pusztai
  • Pál Sipos
  • István Pálinkó
Show all

Summary, in English

Intercalated composite materials were prepared with CaAl-layered double hydroxide as host and Cu(II)-amino acid (L-cysteine, L-histidine and L-tyrosine) complex anions as guests. Two methods (intercalation of the ligand first followed by constructing the complex; preforming the complex first, then introducing it among the layers of the host) and optimization of the synthesis conditions were performed to obtain composites having the complex exclusively among the layers. The composite materials were structurally characterized by powder X-ray diffractometry, mid infrared (IR) spectroscopy with ATR (attenuated total reflectance) or photoacoustic detections, transmission and scanning electron microscopies and X-ray photoelectron spectroscopy. Structural features of the intercalant (coordination number, coordination sites) were elucidated by classical chemical and energy dispersive X-ray analyses, EPR (electron paramagnetic spectroscopy), X-ray absorption and far IR spectroscopies. Structural models based on these methods are also given. Catalytic activities, selectivities and recycling abilities of the substances were studied in the oxidation reactions of cyclohexene with peracetic acid and in situ formed iodosylbenzene as oxidants in the liquid phase. The catalysts were active in the Ullmann coupling reaction as well. The intercalated substances were found to be efficient and highly selective catalysts with very good recycling abilities.

Department/s

Publishing year

2016-11-01

Language

English

Pages

49-60

Publication/Series

Journal of Molecular Catalysis A: Chemical

Volume

423

Document type

Journal article

Publisher

Elsevier

Topic

  • Materials Chemistry

Keywords

  • Catalytic properties in oxidation reactions
  • Cu(II)-amino acid complexes in CaAl-LDH
  • Methods of synthesis
  • Structural characterization

Status

Published

ISBN/ISSN/Other

  • ISSN: 1381-1169