Información general

Rojas G., René
Profesor Titular

Doctor en Química
Universidad de Chile, 2001

Perfil en ORCID

Líneas de investigación

Áreas o líneas de investigación:
Diseño y síntesis de complejos de coordinación con aplicaciones en reacciones de polimerización de oleofinas.
Catálisis heterogénea, modulación de reactividad de por acciones de ácidos de Lewis presentes en el soporte.
Preparación de nanocompositos mediante polimerización in-situ.

Investigación actual: 
La investigación que estamos desarrollando, contempla la síntesis de nuevos complejos organometálicos, los cuales a través de activación exocíclica con ácidos de Lewis, generan sistemas catalíticos más eficientes para polimerización de olefinas. Estos sistemas pueden ser aplicables a catálisis heterogénea y a través de ésta convertirse en nuevas tecnologías de interés industrial.

Docencia

QIM108A   Química Inorgánica III
QIM500     Química Inorgánica Aplicada
QUN1003  Química Inorgánica Ingeniería
QPG3251  Química Inorgánica Avanzada
QPG3220  Química de Organometálicos
QPG3382  Innovaciones en la Industria Química

Proyectos

2013 - 2016:
Chemical Processes and Catalysis, 2012. Investigador Responsable Alterno, Ministerio de Economia Fomento y Turismo. 

2013 - 2015:
Design and Synthesis of Functionalized beta-diimines and amidines. Reactions with Lewis Acids and Transitions Metals; Applications in catalysis. Investigador Responsable, CONICYT / FONDECYT / Regular, 2012. 

2010 - 2013:
Design, synthesis and exocyclic activation of early and late transition metals complexes for use in olefin polymerization catalysis. Investigador Responsable, CONICYT / FONDECYT / Regular, 2010. 

2007 - 2009:
Complejos de coordinación: Síntesis y usos de polimerización de olefinas. Investigador Responsable, UC/VRI/Inicio.

2006 - 2009:
Coordination Complexes: Synthesis and Uses in Olefins Polymerization. Facultad de Química, Pontificia Universidad Católica de Chile Santiago, Chile. CONICYT / FONDECYT / Iniciación, Fondecyt I. Nº 11060384.

2006 - 2009:
Universidad de Chile, (CIMAT) FONDAP #11980002. Investigador Asociado.

Mayo 2001 - Julio 2003:
Synthesis of substituted cyclopentadienyl of early transition metals. Reactivity study toward olefin polymerization. Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile; Fondecyt Nº 3010041. 

VRAID 2006/30 Facultad de Química, Pontificia Universidad Católica de Chile, Santiago, Chile; PUC.

Publicaciones

J. Hurtado, R.S. Rojas, E. Pérez, M. Valderrama, Palladium complex bearing 3,5-bis(benzotriazol-1-ylmethyl)toluene ligand catalyzed oxidative amination of allyl butyl ether. Journal Of The Chilean Chemical Society, 58: 1534-1536 (2013).

R. Rojas, B. People, Development of Imine Derivative Ligands for the Exocyclic Activation of Late Transition Metal Polymerization Catalysts. In: G. Giambastiani; J. Campora, editors. Catalysis by Metal Complexes. Olefin Upgrading Catalysis by Nitrogen-Bases Metal Complexes. Springer, 39-75 (2011).

A. Becerra, C. Quintero, V. Morales, M. Valderrama, A. Aguirre, M.A. Faúndez, R.S. Rojas, Synthesis of 4(3H)quinazolinimines with selective cytotoxic effect on human acute promyelocytic leukemia cells. Bioorganic & Medicinal Chemistry Volume 25, Issue 10, 15 May 2017, Pages 2681–2688 (2017)

D. Osorio Meléndez, J.A. Castro-Osma, A. Lara-Sánchez, R.S. Rojas, A. Otero, Ring-opening polymerization and copolymerization of cyclic esters catalyzed by amidinate aluminum complexes, JOURNAL OF POLYMER SCIENCE, PART A: POLYMER CHEMISTRY, 55, 2397–2407 (2017)

D.E. Ortega, D. Cortes-Arriagada, O.S. Trofymchuk, D. Yepes, S. Gutierrez-Oliva, R.S. Rojas, and A. Toro-Labbe, The Role of Co-Activation and Ligand Functionalization in Neutral Methallyl Nickel(II) Catalysts for Ethylene Oligomerization and Polymerization. Chem. Eur. J., 23, 1 – 11 (2017)

Peoples B, Rojas R, Valderrama M, Frohlich R, Miscione G, Movilla S, Nunez N, Hurtado J., Chromium(III) complexes bearing  bis(benzotriazolyl)pyridine ligands: synthesis, characterization and ethylene polymerization behavior, Journal of Coordination Chemistry, 70(5):803-818 (2017)

A. Antiñolo, F. Carrillo-Hermosilla, R. Fernández-Galán, M.P. Montero-Rama, A. Ramos, E. Villaseñor, R.S. Rojas, A. Rodríguez-Diéguez. Dialkylboron guanidinates: syntheses, structures and carbodiimide de-insertion reactions Dalton Transactions, 45(39):15350-15363 (2016)

Cabrera, A. R., Gonzalez, I. A., Cortes-Arriagada, D., Natali, M., Berke, H., Daniliuc, C. G., Camarada, M. B., Toro-Labbe, A., Rojas, R. S., Salas, C O., Synthesis of new phosphorescent imidoyl-indazol and phosphine mixed ligand Cu(I) complexes structural characterization and photophysical properties. Rsc Advances, 6(7):5141-5153 (2016)

S. Kohrt, G. Kehr, C.G. Daniliuc, R.S. Rojas, B. Rieger, C. Troll, G. Erker., Borata-Alkene Derived Syntheses of (F5C6)2B-Substituted Bis(indenyl) Group 4 Metal Complexes. Organometallics,35(16):2689-2693 (2016)

T. Holtrichter-Rößmann, I. Häger, C.G. Daniliuc, R. Fröhlich, K. Bergander, C. Troll, B. Rieger, R.S. Rojas, E. Ulrich Würthwein. Catalytically Active N-Acylamidine¿Zirconium Complexes: Synthesis, Structures, and Application in Ethylene Polymerization, Organometallics, 35(11):1906-1915 (2016)

A.R. Cabrera, I. Martinez, C.G. Daniliuc, G.B. Galland, C.O. Salas, R.S. Rojas, New air stable cationic methallyl Ni complexes bearing imidoyl-indazole carboxylate ligand: Synthesis, characterization and their reactivity towards ethylene Journal of Molecular Catalysis A: Chemical 414, 19–26 (2016)

M.A. Escobar; M. Valderrama; C.G. Daniliuc; R.S. Rojas,.Synthesis and Characterization of New Diazenecarboxamide Ligands Using a Selective Adduct Formation with B(C6F5)3. J. Braz. Chem. Soc., 27, No 1, 194-201 (2016)

S.O. Trofymchuk, G. Barrera Galland, M.A. Milani, R.S. Rojas. Methyl Branching in Polyethylene from Homopolymerization of Ethylene with IV-Arylcyano-b-diketiminate methallyl nickel-B(C6F5)3. Journal Of Polymer Science Part A-Polymer Chemistry, 53(3): 452-458 (2015).

Trofymchuk O, Rojas R, Daniliuc C, Kehr G, Erker G. Synthesis and structures of N-arylcyano-beta-diketiminate zinc complexes and adducts and their application in ring-opening polymerization of L-lactide.Royal Society of Chemistry Advances, 5(27): 21054-21065 (2015).

R. Rojas, A. Toro, P. Pérez, D. Yepes, P. Jaque, E. Chamorro, L. Domingo. A computational and conceptual DFT study on the mechanism of hydrogen activation by novel frustrated Lewis pairs. Physical Chemistry Chemical Physics, 17(16): 10715-10725 (2015).

A. Cabrera, F. Werlinger, R. Rojas, M. Valderrama, E. Villaseñor, A. Antiñolo, F. Carrillo-Hermosilla, R. Fernández-Galan. Grafting of the zirconium complexes [Zr(η5-C5H5){NC-amidine}Cl2] and [Zr(η5-C5H5)(NC-NacNac)Cl2] and the study of their behavior in ethylene polymerization. Journal Of Molecular Catalysis A-Chemical, 391(1): 130-138 (2014).

J. Hurtado, E. Nagles, V. Arancibia, R. Rojas, M. Valderrama, R. Frohlich. Synthesis and structural characterization of new 2-bromo-1,3-bis(triazol-1-ylmethyl)benzene ligands. Study of their behavior as complexing agents for determination of nickel(II) by adsorptive stripping voltammetry. Journal Of Coordination Chemistry, 66(4): 592-601 (2013).

J. Hurtado, R.S. Rojas, E. Perez, M. Valderrama Palladium complex bearing 3,5-bis(benzotriazol-1-ylmethyl)toluene ligand catalyzed oxidative amination of allyl butyl ether. Journal Of The Chilean Chemical Society, 58: 1534-1536 (2013).

O. Trofymchuk, C. Quintero, R. Rojas, D. Gutsulyak, M. Parvez, C. Daniliuc. Piers W. N-Arylcyano-beta-diketiminate Methallyl Nickel Complexes: Synthesis, Adduct Formation, and Reactivity toward Ethylene. Organometallics, 32(24): 7323-7333 (2013).

M. Escobar, D. Jara, R. Tapia, L. Lemus, R. Froehlich, J. Guerrero, R. Rojas. Copper(I) complexes bases on a new indazol-4,7-dione ligand. Polyhedron, 62: 66-74 (2013).

R. Rojas, A. Cabrera, B. Peoples, K. Spannhoff, M. Valderrama, R. Frohlich, G. Kehr, G. Erker., Synthesis of [(pi-cyano-P-nacnac)Cp] and [(pi-cyano-nacnac)Cp]-zirconium complexes, and their remote activation for ethylene polymerization. Dalton Transactions, 41(4): 1243-1251 (2012).

B. Peoples, G. De La Vega, C. Valdebenito, R. Quijada, A. Ibañez, M. Valderrama, R. Rojas,. Nickel pre-catalysts bearing [(N)-imidoylamidine] ligands; influence of the presence of pyridine and pentafluorophenyl groups in ligand backbone on the reactivity in ethylene polymerizations. Journal Of Organometallic Chemistry, 700: 147-153 (2012).

R. Rojas, A. Cabrera, B. Peoples, K. Spannhoff, M. Valderrama, R. Frohlich, G. Kehr, G. Erker,. Synthesis of [(pi-cyano-P-nacnac)Cp] and [(pi-cyano-nacnac)Cp]-zirconium complexes, and their remote activation for ethylene polymerization. Dalton Transaction, 41(4): 1243-1251 (2012).

A. Cabrera, Y. Schneider, M. Valderrama, G. Galland, R. Rojas,. Synthesis and Characterization of Materials Prepared via the Copolymerization of Ethylene with 1-Octadecene and Norbornene Using a [(pi-Cyano-nacnac)Cp] Zirconium Complex. Journal Of Polymer Science Part A-Polymer Chemistry, 49(7): 1535-1542 (2011).

J. Hurtado, A. Ibañez, R. Rojas, M. Valderrama, R. Frohlich,Organonickel(II) Complexes with Anionic Tridentate 1,3-Bis(azolylmethyl)phenyl Ligands. Synthesis, Structural Characterization and Catalytic Behavior. Journal Of The Brazilian Chemical Society, 22(9): 1750-1757 (2011).

J. Hurtado, J. Ugarte, R. Rojas, M. Valderrama, D. MacLeod Carey, A. Muñoz-Castro, R. Arratia-Perez, R. Fröhlich.  New bis(azolylcarbonyl)pyridine chromium(III) complexes as initiators for ethylene polymerization. Inorganica Chimica Acta, 378: 218-233 (2011).

R. Rojas, B. Peoples, A. Cabrera, M. Valderrama, R. Frohich, G. Kehr, G. Erker, T. Wiegand, H. Eckert, Synthesis and Structure of Bifunctional Zirconocene/Borane Complexes and Their Activation for Ethylene Polymerization, Organometallics, 30(23): 6372-6382 (2011).

K. Spannhoff, R. Rojas, R. Frohlich, G. Kehr, G. Erkert, Reactions of Topologically Related "nacnach-CN" and "P-nacnach-CN" Chelate Ligand Systems with HB(C6F5)(2) Chelate Ligand Systems with HB(C6F5)2. Organometallic, 30(8): 2377-2384 (2011).

A. Cabrera, Y. Schneider, M. Valderrama, R. Frohlich, G. Kehr, G. Erker, R. Rojas, Synthesis of a [(Cyano-nacnac)Cp]zirconium complex and its remote activation for ethylene polymerization. Organometallics, 29: 6104-6110, (2010).

J.Hurtado, A. Ibáñez, R. Rojas, M. Valderrama, Palladium(II) complexes bearing the new pincer ligand 3,5-bis(indazol-2-ylmethyl)toluene; synthesis and catalytic properties. Inorganic Chemistry Communications, 13(9): 1025-1028 (2010).

J. Azoulay, R. Rojas, A. Serrano, H. Ohtaki, G. Galland, G. Wu, G. Bazan, Nickel alpha-Keto-beta-Diimine Initiators for Olefin Polymerization. Angewandte Chemie-International Edition, 48(6): 1089-1092 (2009).

B.M. Boardman, G. Wu, R. Rojas, G.C. Bazan, Binding modes of a dimethyliminopentanone ligand on nickel pre-catalysts toward olefin polymerization. Journal Of Organometallic Chemistry, 694(9-10): 1380-1384 (2009).

R. Caris, B.C. Peoples, M. Valderrama, G. Wu, R. Rojas, Mono and bimetallic nickel bromide complexes bearing azolate-imine ligands: Synthesis, structural characterization and ethylene polymerization studies. Journal Of Organometallic Chemistry, 694(12): 1795-1801 (2009).

C. Covarrubias, R. Quijada, R. Rojas, Synthesis of nanosized ZSM-2 zeolite with potential acid catalytic properties. Microporous And Mesoporous Materials, 117(1-2): 118-125 (2009).

J. Hurtado, M. Portaluppi, R. Quijada, R. Rojas, M. Valderrama, Synthesis, characterization, and reactivity studies in ethylene polymerization of cyclometalated palladium(II) complexes containing terdentate ligands with N,C,N-donors. Journal Of Coordination Chemistry, 62(17): 2772-2781 (2009).

J. Hurtado, D.M.L. Carey, A. Muñoz-Castro, R. Arratia-Pérez, R. Quijada, G. Wu, R. Rojas, M. Valderrama, Chromium(III) complexes with terdentate 2,6-bis(azolylmethyl)pyridine ligands: Synthesis, structures and ethylene polymerization behavior. Journal Of Organometallic Chemistry, 694(16): 2636-2641 (2009).

C. Valdebenito, M. Garland, R. Quijada, R. Rojas, Acetamidine complexes as catalysts for ethylene polymerization. Journal Of Organometallic Chemistry, 694(5): 717-725 (2009).

B. Boardman, M. Valderrama, F. Muñoz, G. Wu, G. Bazan, R. Rojas, Remote activation of nickel complexes by coordination of B(C6F5)(3) to an exocyclic carbonitrile functionality. Organometallics, 27(8): 1671-1674 (2008).

C. Carone, R. Bisatto, G. Galland, R. Rojas, G. Bazan, Ethylene polymerization and copolymerization with a polar monomer using an alpha-iminocarboxamide nickel complex activated by trimethylaluminum. Journal Of Polymer Science Part A-Polymer Chemistry, 46(1): 54-59 (2008).

C. Covarrubias, R. Quijada, R. Rojas, Ethylene polymerization using dealuminated ZSM-2 zeolite nanocrystals as an active metallocene catalyst support. Applied Catalysis A-General, 347(2): 223-23 (2008).

S. Scott, B. Peoples, C. Yung, R. Rojas, V. Khanna, H. Sano, T. Suzuki, F. Shimizu, Highly dispersed clay-polyolefin nanocomposites free of compatibilizers, via the in situ polymerization of a-olefins by clay-supported catalystsw, Chemical Communications, 1(1): 4186-4188 (2008).

R. Rojas, G. Galland, G. Wu, G. Bazan, Single-component alpha-iminocarboxamide nickel ethylene polymerization and copolymerization initiators. Organometallics, 26(22): 5339-5345 (2007).

R. Rojas, J.C. Wasilke, G. Wu, J.W. Ziller, G.C. Bazan, Alpha-Iminocarboxamide Nickel Complexes: Synthesis and Uses in Ethylene Polymerization. Organometallics, 24(23): 5644-5653 (2005).

R. Rojas, M. Valderrama, M. Garland, Substituted Cyclopentadienylchromium(III) Complexes Containing Neutral Donor Ligands. Synthesis, Crystal Structures and Reactivity in Ethylene Polymerization. Journal Of Organometallic Chemistry, 689(2): 293-301 (2004).

Rene Rojas, Mauricio Valderrama, Guang Wu, Synthesis, Structural Characterization and Ethylene Polymerization Behavior of Complex [Ph4P][CrCl3{Hb(Pz)3}] [Hb(Pz)3= Hydrotris(1-Pyrazolyl)Borate]. Inorganic Chemistry Communications, 7(12): 1295-1297 (2004).

R. Rojas, M. Valderrama, Trimethylsilylcyclopentadienylchromium(III) Complexes With Diphenyl-2-Pyridylphosphine: Synthesis, Structural Characterisation and Catalytic Behaviour of [(C6H5)2PC5H4nh][(N5-Me3sicp)CrCl2]. Journal Of Organometallic Chemistry, 689(13): 2268-2272 (2004).

Griselda Galland, Raúl Quijada, Rene Rojas, Guillermo Bazan, Zachary Komon, J. A. NMR Study of Branched Polyethylenes Obtained with Combined Fe and Zr Catalysts., Macromolecules, 35(2): 339-345 (2002).

Premios y Distinciones

Humboldt Research Fellowship for Experienced Researchers (2008).

Proyecto a desarrollar “Heterobimetallic and Dendritic Transition Metal Catalysts for the in situ copolymerization of ethylene and -olefins” en Westfälische Wilhelms-Universität Organisch-Chemisches Institut, Muenster, Germany.

Fulbright Scholarship, 2000, Departments of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106.

Best porter presentation award “Progress in the Design and Synthesis of non-ionic Late Transition Metal Initiator Toward Olefins Polymerization”. 5th Internacional Workshop on Heterogeneous Ziegler-Natta Catalysts. Ishikawa, Japan March 18-21, 2007

Patentes

“Method for forming exfoliated clay-polyolefin nanocomposites", Peoples, B.C., Rojas, R., Tanna, A., Shimizu, F., Scott, S.L., US Patent Application No 11,451,199.

"Method for forming exfoliated clay-polyolefin nanocomposites", Peoples, B.C., Rojas, R., Tanna, A., Shimizu, F., Scott, S.L., WO Patent Application submitted 06/12/2007.

“Single Component, Phosphine-Free, Initiators for Ethylene Homopolymerization and Copolymerization with Functionalized co-Monomers " UC Case No.2006-302.