Browsing by Author "Martinez-Diaz, Ivan"

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    A new series of zirconium metallocenes derived from partially alkylated s-indacene with potential applications in the polymerization of ethylene
    (2015) Felipe Araneda, Juan; Morales-Verdejo, Cesar; Adams, Christopher; Martinez-Diaz, Ivan; Chavez, Ivonne; Teresa Garland, Maria; Rojas, Rene S.; Molins, Elies; Manuel Manriquez, Juan
    This contribution describes the synthesis and characterization of a series of zirconium metallocenes derived from partially alkylated s-indacene. The complexes [Cp*ZrCl2-s-Ic '' H] 1, [Cp/ZrCl2-s-Ic '' H] 3 and [CpZrCl2-s-Ic '' H] 4 (s-Ic'H = 2,6-diethyl-4,8-dimethyl-1-hydro-s-indacene; s-Ic '' H = 2,6-dibutyl-4,8-dimethyl-1-hydro-s-indacene) were synthesized from the monolithiated salts of s-indacene (s-Ic'H or s-Ic '' H) with one equivalent of C5R5ZrCl3 (R = H, CH3). All complexes here reported were characterized by means of H-1 and C-13 NMR, mass spectrometry, elemental analysis. Complexes [Cp*ZrCl2-s-Ic'H] 1 and [CpZrCl2-s-Ic'H] 2 (previously reported by NMR analysis) were characterized by X-ray diffraction. In order to gain further knowledge about their catalytic behavior, the complexes were tested in the catalysis of ethylene polymerization showing a highest activity. Complex 4 presents the highest ethylene polymerization activity than complexes 1 and 2, and 3 under the same working conditions. (C) 2015 Elsevier B.V. All rights reserved.
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    New mono and bimetallic iron complexes derived from partially methylated s-indacene. Evidence of a trinuclear iron s-indacene complex
    (2014) Morales-Verdejo, Cesar; Martinez-Diaz, Ivan; Adams, Christopher; Araneda, Juan Felipe; Oehninger, Luciano; Carey, Desmond Mac-Leod; Munoz-Castro, Alvaro; Arratia-Perez, Ramiro; Chavez, Ivonne; Manuel Manriquez, Juan
    The preparation and characterization of new mono- and multinuclear iron complexes derived from s-indacene partially alkylated has been achieved by the development of rational synthetic routes. The synthesis of the new multimetallic complexes are based on the employment of 1,5-dihydro-2,4,6, 8-tetramethyl-s-indacene (Ic'H-2) as ligand to obtain two monometallic complexes, namely, [Cp*-Fe-(eta(5)-2,4,6,8-tetramethyl-5-hydro-s-indacenide)] (1), and [Fe-bis(eta(5)-2,4,6,8-tetramethyl-5-hydro-s-indacenide)] (2) (Cp* = pentamethylcyclopentadiene), as well as, the new bimetallic [Cp*Fe-(mu:eta(5):eta(5)-2,4,6,8-tetramethyl-s-indaceneiide)-FeCp*] (3) and trimetallic [Fe-bis{Cp*Fe-(mu:eta(5):eta(5)-2,4,6,8-tetramethyl-s-indaceneiide)}] (4) complexes. All complexes here reported were characterized by means of H-1, C-13 NMR, mass spectrometry, elemental analysis, together with cyclic voltammetry. In addition, these complexes have been studied by DFT methods in order to gain further knowledge about its electronic structure. In addition, the possibility to generate organometallic polymers employing the complexes here reported, is proposed theoretically with the study of an oligomer titled as [Cp*(Fe(Ic')}(4)FeCp*], 6(t). (C) 2013 Elsevier Ltd. All rights reserved.