Browsing by Author "Manuel Manriquez, Juan"

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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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    A PRELIMINARY STUDY ON ELECTROCATALYTIC REDUCTION OF CO2 USING FAC-ReI(CO)3(4,4′-DIMETHYL-2,2′-BIPYRIDYL)((E)-2-((3-AMINO-PYRIDIN-4-YLIMINO)-METHYL)-4,6-DI-TERT-BUTYLPHENOL))+COMPLEX
    (2017) Carlos Canales, Juan; Carreno, Alexander; Oyarzun, Diego; Manuel Manriquez, Juan; Chavez, Ivonne
    Several research to explore the possible conversion of CO2 using rhenium(I) tricarbonyl complexes have been reported the last years. In the present work, we investigated a potential use of fac-Re(CO)(3)(4,4'-di-methyl-2,2'-bipyridyl)L+ complex (C2), where L is an electron-withdrawing ancillary ligands which present an intramolecular hydrogen bond (IHB), in a preliminary electrocatalytic reduction of CO2 . The C2 complex was synthesized and characterized according to reported methods earlier. The cyclic voltammogram profile for the C2 complex were studied in dichloromethane under inert atmosphere, and it shows a typical behavior for an electrocatalytic process, the C2 complex illustrate the electrochemical reaction mechanism corresponds to an electrochemical chemical electrochemical pathway (ECE). Also, a Vitreous Carbon plate used as working electrode was employed and modified by cycling the anodic region of C2 in CH2Cl2 which involve the oxidative redox response for the -NH2 and -OH groups. The voltammogram profile involve shows a polymeric deposit on the plate surface in a CO2 saturated solution (pH=7.0). A strong electrocatalytic discharge of current is obtained with a wave foot of -1.3 V showing that C2 have the potential to be used in electrocatalyst CO2 reduction.
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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.
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    Synthesis and structure of some heterobimetallic complexes having a polyalkyl-s-indacenyl spacer
    (ELSEVIER SCIENCE SA, 2013) Morales Verdejo, Cesar; Martinez, Ivan; Mac Leod Carey, Desmond; Chavez, Ivonne; Manuel Manriquez, Juan; Matioszek, Dimitri; Saffon, Nathalie; Castel, Annie; Riviere, Pierre; Molins, Elies
    Three heterobimetallic complexes LmM(s-Ic')M'Ln (M = Fe, Ru or Mn; M' = Ni) having the same Cp* nickel moiety and based on a polyalkyl-s-indacenyl spacer (s-Ic' = 2,6-diethyl-4,8-dimethyl-s-indacenyl) were synthesized by reacting Cp* Ni(acac) with the lithium derivative of the parent monometalated complex. All three compounds were fully characterized and shown to adopt a trans geometry by X-ray crystallography. (C) 2012 Elsevier B. V. All rights reserved.