New bis(azolylcarbonyl)pyridine chromium(III) complexes as initiators for ethylene polymerization

John Hurtado, Javiera Ugarte, René Rojas, Mauricio Valderrama, Desmond Mac-Leod Carey, Alvaro Muñoz-Castro, Ramiro Arratia-Pérez, Roland Fröhlich

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Reaction of 2,6-pyridinedicarbonyl dichloride with 3,5-dimethylpyrazole and 1H-indazole, respectively, yield the tridentate ligands 2,6-bis(3,5- dimethylpyrazol-1-ylcarbonyl)pyridine (1) and 2,6-bis(indazol-1-ylcarbonyl) pyridine (2). The molecular structure of the new compound (2) was determined by single-crystal X-ray diffraction. These ligands react with CrCl 3(THF)3 in THF to form neutral complexes of general formula [CrCl3{2,6-bis(azolylcarbonyl)pyridine-N,N,N}] (3, 4) which were isolated in high yield as air stable green solids and characterized by elemental analysis, magnetic moment, IR, and mass spectroscopies. Theoretical calculations predict that the thermodynamically preferred structure of the complexes is the fac configuration. After reaction with methylaluminoxane (MAO) the chromium(III) complexes are active for the polymerization of ethylene.

Original languageEnglish
Pages (from-to)218-223
Number of pages6
JournalInorganica Chimica Acta
Volume378
Issue number1
DOIs
Publication statusPublished - 30 Nov 2011

Keywords

  • Chromium
  • Ethylene polymerization
  • Theoretical studies
  • Tridentate ligands

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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