Superoxide dismutase inspired immobilised Ni(II)-protected amino acid catalysts - Synthesis, characterisation, and catalytic activity

Zita Csendes, Gábor Varga, Hajnal Schmehl, Zita Timár, Stefan Carlson, Sophie E. Canton, Éva G. Bajnóczi, Dániel Sebok, Imre Dékány, Gábor Elek, Pál Sipos, István Pálinkó

Research output: Contribution to journalArticle

Abstract

Covalently anchored Ni(II)-C-protected amino acid (l-histidine, l-cysteine, and l-cystine) complexes inspired by the active site of the Ni-superoxide dismutase enzyme were synthesised using chloropropylated silica gel as support. The structural features of the surface complexes were studied by the Kjeldahl method and ICP-MS, mid/far IR, UV-vis diffuse reflectance, and X-ray absorption spectroscopies. The enzyme-like activities of the materials were determined in a biochemical test reaction. Covalent grafting and building the complex onto the surface of the support were successful in all cases. It was found that in many instances the structures obtained and the coordinating groups substantially varied upon changing the conditions of the syntheses. All the covalently immobilised Ni(II)-complexes displayed enzyme-like activity. They also were active in the liquid-phase oxidation of cyclohexene, providing the epoxide with high selectivity.

Original languageEnglish
Pages (from-to)93-99
Number of pages7
JournalJournal of Molecular Catalysis A: Chemical
Volume395
DOIs
Publication statusPublished - Dec 2014

Keywords

  • Biomimetic catalysis
  • Catalytic activities
  • Silica immobilised Ni(II)-complexes
  • XAS

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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