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Chromium(III) complexes with terdentate 2,6-bis(azolylmethyl)pyridine ligands: Synthesis, structures and ethylene polymerization behavior |
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| Authors: | John Hurtado,Alvaro Muñ oz-Castro,Raú l Quijada,René Rojas,Mauricio Valderrama |
| Affiliation: | a Departamento de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-6094411, Chile b Departamento de Ciencias Químicas, Facultad de Recursos Naturales, Universidad Andrés Bello, República 275, Santiago, Chile c Centro para la Investigación Interdisciplinaria Avanzada en Ciencia de los Materiales (CIMAT), Santiago, Chile d Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA, USA |
| 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. |
| Keywords: | Chromium Terdentate ligands Theoretical studies Ethylene polymerization |
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