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Title: New bis(azolylcarbonyl)pyridine chromium(III) complexes as initiators for ethylene polymerization
Authors: Hurtado, John
Ugarte, Javiera
Rojas, René
Valderrama, Mauricio
Carey, Desmond Mac-Leod
Muñoz-Castro, Alvaro
Arratia-Pérez, Ramiro
Fröhlich, Roland
Keywords: Chromium;Ethylene polymerization;Tridentate ligands;Theoretical studies
Issue Date: 2011
Publisher: Inorganica Chimica
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 CrCl3(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.
ISSN: 0020-1693
Appears in Collections:Producción Científica

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