Chromium(III) complexes with terdentate 2,6-bis(azolylmethyl)pyridine ligands: Synthesis, structures and ethylene polymerization behavior

John Hurtado, Desmond Mac Leod Carey, Alvaro Muñoz-Castro, Ramiro Arratia-Pérez, Raúl Quijada, Guang Wu, René Rojas, Mauricio Valderrama

Research output: Contribution to journalShort surveypeer-review

19 Citations (Scopus)

Abstract

Reactions of 2,6-bis(bromomethyl)pyridine with 3,5-dimethylpyrazole and 1H-indazole yield the terdentate ligands 2,6-bis(3,5-dimethylpyrazol-1-ylmethyl)pyridine (5) and 2,6-bis(indazol-2-ylmethyl)pyridine (6). The molecular structure of the new compound 6 was determined by single-crystal X-ray diffraction. These ligands react with the CrCl3(THF)3 complex in THF to form neutral complexes of general formula [CrCl3{2,6-bis(azolylmethyl)pyridine-N,N,N}] (7, 8) which are isolated in high yields as stable green solids and characterized by means of elemental analysis, magnetic moments, IR, and mass spectroscopy. 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 in the polymerization of ethylene.

Original languageEnglish
Pages (from-to)2636-2641
Number of pages6
JournalJournal of Organometallic Chemistry
Volume694
Issue number16
DOIs
Publication statusPublished - 15 Jul 2009

Keywords

  • Chromium
  • Ethylene polymerization
  • Terdentate ligands
  • Theoretical studies

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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