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

Autor:	Ramiro Arratia-Pérez, Mauricio Valderrama, Javiera Ugarte, Desmond Mac-Leod Carey, John Hurtado, Roland Fröhlich, Alvaro Muñoz-Castro, Rene S. Rojas
Jazyk:	angličtina
Rok vydání:	2011
Předmět:	Ethylene Magnetic moment Inorganic chemistry Methylaluminoxane chemistry.chemical_element Inorganic Chemistry chemistry.chemical_compound Chromium chemistry Polymerization Yield (chemistry) Pyridine Polymer chemistry Materials Chemistry Molecule Physical and Theoretical Chemistry
Zdroj:	INORGANICA CHIMICA ACTA Artículos CONICYT CONICYT Chile instacron:CONICYT
Popis:	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.
Databáze:	OpenAIRE
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