Hydrothermal synthesis of a novel μ-dihydroxo-bis(2,6- pyridinedicarboxylatoaquachromium(III)) complex and investigation of its catalytic activity

Burak Ay, Emel Yildiz, Stephanie Jones, Jon A Zubieta

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A new chromium(III) compound [Cr(H 2O)(OH)(C 7H 3NO 4)] 2, μ-dihydroxo-bis(2,6- pyridinedicarboxylatoaquachromium(III)), has been successfully synthesized by the hydrothermal reaction of 2,6-pyridinedicarboxylic acid (H 2pydc) and CrCl 3·6H 2O in the alkali medium. This metal complex was characterized by elemental analysis, IR spectroscopy, thermal analysis and single-crystal X-ray diffraction. The X-ray analysis showed that the structure is molecular and consists of units of two Cr(H 2O)(OH) (C 7H 3NO 4) groups linked through two OH groups. In the complex, each Cr centre is in a distorted octahedral environment, defined by two hydroxyl bridges, an aqua ligand and a tridentate pyridinedicarboxylate anion. The thermal stability and catalytic properties of the complex were also investigated. The complex affected the oxidation of thymol to thymoquinone with 100% selectivity and a conversion rate of 20.25%.

Original languageEnglish (US)
Pages (from-to)15-19
Number of pages5
JournalInorganica Chimica Acta
Volume387
DOIs
StatePublished - May 30 2012

Fingerprint

Chromium compounds
Thymol
Hydrothermal synthesis
Coordination Complexes
X ray analysis
Alkalies
Metal complexes
Hydroxyl Radical
Thermoanalysis
Molecular structure
Anions
catalytic activity
Infrared spectroscopy
Catalyst activity
Thermodynamic stability
Negative ions
thymol
Ligands
Single crystals
X ray diffraction

Keywords

  • 2,6-Pydc
  • Cr(III) complex
  • Crystal structure
  • Heterogeneous catalysis
  • Hydrothermal synthesis
  • Thymoquinone

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Chemistry

Cite this

Hydrothermal synthesis of a novel μ-dihydroxo-bis(2,6- pyridinedicarboxylatoaquachromium(III)) complex and investigation of its catalytic activity. / Ay, Burak; Yildiz, Emel; Jones, Stephanie; Zubieta, Jon A.

In: Inorganica Chimica Acta, Vol. 387, 30.05.2012, p. 15-19.

Research output: Contribution to journalArticle

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AB - A new chromium(III) compound [Cr(H 2O)(OH)(C 7H 3NO 4)] 2, μ-dihydroxo-bis(2,6- pyridinedicarboxylatoaquachromium(III)), has been successfully synthesized by the hydrothermal reaction of 2,6-pyridinedicarboxylic acid (H 2pydc) and CrCl 3·6H 2O in the alkali medium. This metal complex was characterized by elemental analysis, IR spectroscopy, thermal analysis and single-crystal X-ray diffraction. The X-ray analysis showed that the structure is molecular and consists of units of two Cr(H 2O)(OH) (C 7H 3NO 4) groups linked through two OH groups. In the complex, each Cr centre is in a distorted octahedral environment, defined by two hydroxyl bridges, an aqua ligand and a tridentate pyridinedicarboxylate anion. The thermal stability and catalytic properties of the complex were also investigated. The complex affected the oxidation of thymol to thymoquinone with 100% selectivity and a conversion rate of 20.25%.

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