http://www.saber.ula.ve/handle/123456789/449 Articulos, Pre-prints del Laboratorio de Organometálicos Fri, 15 May 2026 12:11:22 GMT 2026-05-15T12:11:22Z http://www.saber.ula.ve/handle/123456789/34688 Synthesis, characterization and hydroformylation catalytic activity of a water-soluble RhCl(CO)(PySO3Na)2 complex using 1-hexene and real naphtha Fonseca V., Yuraima J.; Fontal, Bernardo; Reyes, Marisela del C.; Suárez B., Trino; Bellandi, Fernando; Díaz, Juan C.; Cancines, Pedro I. In this work, we describe the synthesis and characterization of a new water soluble [RhCl(CO)(PySO3Na)2], complex (1); where [PySO3Na] is the sodium salt of p-sulfonated pyridine ligand. Complex (1) was obtained in methanol, reacting the dried sodium salt of p-sulfonated pyridine ligand with [Rh(Cl)(CO)2]2 complex under inert atmosphere. Complex (1) was characterized by FT-IR and 1H NMR techniques. Complex (1) was active in the catalytic hydroformylation of 1-hexene and real naphtha in a biphasic (water/toluene) system. The effects of reaction time, temperature and syngas pressure were studied with 1-hexene as a substrate. Formation of metallic particles was tested with a mercury drop trial, giving negative results. Reuse of the aqueous phase for several times under the same conditions showed little catalytic activity loss. Complex (1) was active for the hydroformylation reaction of 1-hexene, in the presence of thiophene compounds, showing better performance in comparison with water soluble rhodium analogues. Fri, 16 Mar 2012 18:53:12 GMT http://www.saber.ula.ve/handle/123456789/34688 2012-03-16T18:53:12Z http://www.saber.ula.ve/handle/123456789/33649 Afinidad electrónica y singularidades de la tabla periódica Suárez B., Trino Mon, 22 Aug 2011 17:23:10 GMT http://www.saber.ula.ve/handle/123456789/33649 2011-08-22T17:23:10Z http://www.saber.ula.ve/handle/123456789/33648 Aqueous biphasic olefin hydroformylation catalyzed by water-soluble rhodium complexes Suárez B., Trino; Fontal, Bernardo; León, Gustavo; Reyes, Marisela; Bellandi, Fernando; Contreras, Ricardo Rafael; Cancines, Pedro Catalysis with water-soluble rhodium complexes, RhCl(CO)(TPPMS)2, [TPPMS = P(C6H5)2(C6H4SO3)] (1), RhCl(CO)(TPPDS)2, [TPPDS = P(C6H5)(C6H4SO3)2] (2) and RhCl(CO)(TPPTS)2, [TPPTS = P(C6H4SO3)3] (3) in hydroformylation of 1-hexene, 2-pentene, 2,3-dimethyl-1-butene, cyclohexene and several mixtures of these olefins have been studied, under moderate reaction conditions (T: 50–150 C; pCO/pH2 = 1; total p: 14–68 bar; Substrate/ Catalyst: 600/1) in biphasic toluene/water media. The catalytic system shows high activity but low selectivity. The linear and branched oxygenated products obtained are equally useful in naphtha upgrading, as observed in the real El Palito naphtha tried. The catalysts can be recycled several times without significant activity loss. Wed, 17 Aug 2011 14:49:17 GMT http://www.saber.ula.ve/handle/123456789/33648 2011-08-17T14:49:17Z http://www.saber.ula.ve/handle/123456789/33647 Hidrogenación de Aromáticos en la Catálisis del Complejo Ru(η5- C5H5)(Cl)(TPPDS)2 en Medio Bifásico Orgánico/Agua Guzmán, Angie; Suárez B., Trino; León, Gustavo; Fontal, Bernardo; Reyes, Marisela; Bellandi, Fernado; Contreras, Ricardo Rafael; Cancines, Pedro En este trabajo se presentan los resultados de la hidrogenación de compuestos aromáticos como el tolueno, benceno y m-xileno en un sistema bifásico heptano/agua, utilizando como precursor catalítico el complejo Ru(η5-C5H5)(Cl)(TPPDS)2 (TPPDS = trifenilfosfinadisulfonada). Tanto el ligando como el complejo se sintetizaron y se caracterizaron por las técnicas espectroscópicas convencionales (RMN-1H, 13C, 31P, FTIR y SM). Los parámetros óptimos experimentales encontrados, utilizando tolueno como sustrato patrón, fueron: 105ºC, 1400 psi de hidrógeno, relación sustrato/catalizador 600:1 durante 4 horas de reacción. La conversión del tolueno aumenta con la temperatura, la presión de hidrógeno y con la fuerza iónica del medio. La variación del pH influye en la estabilidad de la especie activa para la catálisis ya que a pH 2 y 10 la velocidad de la reacción aumenta debido a la posible formación de partículas metálicas de rutenio. La prueba de la gota de mercurio muestra tendencia a inhibir la actividad catalítica del precursor para la hidrogenación bajo estas condiciones de trabajo. El precursor catalítico se reutilizó durante cuatro ciclos consecutivos sin perdida aparente de la actividad en presencia de un exceso de ligando. Artículo presentado en el XIX Simposio Iberoamericano de Catálisis. Septiembre 5-11, 2004. Mérida, Yucatán, México Wed, 17 Aug 2011 14:39:52 GMT http://www.saber.ula.ve/handle/123456789/33647 2011-08-17T14:39:52Z http://www.saber.ula.ve/handle/123456789/33645 Biphasic catalysis with RuCl2(DMSO)(TPPMS)3 Suárez B., Trino; Fontal, Bernardo; Reyes, Marisela; Bellandi, Fernado; Contreras, Ricardo Rafael; Millán, Enrique; Cancines, Pedro; Paredes, Danny A mononuclear RuCl2(DMSO)(TPPMS)3 complex (1) (TPPMS ¼ triphenylphosphine monosulfonate) has been synthesized. Spectroscopic analysis by i.r., u.v.–vis., 1H-, 13C-, 31P-n.m.r., cyclic voltammetry, m.s. analysis and MO calculations were in agreement with a possible octahedral structure. Biphasic (H2O/PhMe) catalytic studies have shown good olefin hydrogenation activity by the complex at moderate temperature and pressure. Tue, 16 Aug 2011 19:43:53 GMT http://www.saber.ula.ve/handle/123456789/33645 2011-08-16T19:43:53Z http://www.saber.ula.ve/handle/123456789/33644 Hydrogenation of aromatics with [Ru(g5-C5H5)Cl(TPPDS)2] in biphasic medium Suárez B., Trino; Guzmán, Angie; Fontal, Bernardo; Reyes, Marisela; Bellandi, Fernando; Contreras, Ricardo Rafael; Cancines, Pedro; Léon, Gustavo; Rojas, Loguard [Ru(g5-C5H5)Cl(TPPDS)2], [TPPDS=P(C6H5)(C6H4SO3 ))2] in biphasic (n-heptane/water) medium hydrogenates toluene, benzene and m-xylene (105 C, 1400 psig H2, substrate/catalyst=600:1, 4 h) and in toluene hydrogenation gives methylcyclohexane. Catalytic activity increases with temperature, H2 pressure, ionic strength, and pH lower than 10. The catalytic water solution can be reused several times with little activity loss. Tue, 16 Aug 2011 19:19:25 GMT http://www.saber.ula.ve/handle/123456789/33644 2011-08-16T19:19:25Z http://www.saber.ula.ve/handle/123456789/33643 Teoría de repulsión del par electrónico del nivel de valencia (TRPENV) Suárez B., Trino Tue, 16 Aug 2011 16:54:00 GMT http://www.saber.ula.ve/handle/123456789/33643 2011-08-16T16:54:00Z http://www.saber.ula.ve/handle/123456789/33633 Synthesis, characterization and olefin hydroformylation reactions of mer-[Mo(CO)3(p-C5H4N-CN)3] Suárez B., Trino; Fontal, Bernardo; Parra, María F.; Reyes, Marisela del C.; Bellandi, Fernando; Díaz, Juan C.; Cancines, Pedro I.; Fonseca V., Yuraima J. Mer-[Mo(CO)3(p-C5H4N-CN)3] was prepared by UV-irradiation of a THF solution of Mo(CO)6 and paracyanopyridine under heating. The complex was characterized by FT-IR, MS, 1H and 13C NMR and showed catalytic activity for olefin hydroformylation (1-hexene, cyclohexene and 2,3-dimethyl-2-butene as model olefins; 600 psi synthesis gas (pCO/pH2 = 1); 100 C; 24 h; toluene). An examination of the complex catalyzed hydroformylation of a real naphtha cut (El Palito refinery, Venezuela), under the same conditions, also showed activity in the conversion to oxygenated products. Artículo Publicado en Springer Science+Business Media B.V. 2010 Tue, 12 Jan 2010 00:00:00 GMT http://www.saber.ula.ve/handle/123456789/33633 2010-01-12T00:00:00Z http://www.saber.ula.ve/handle/123456789/33632 Hydroformylation reactions of the trans-Mo(CO)4(p-C5NH4SO3NA)2 complex in biphasic medium Suárez B., Trino; Fontal, Bernardo; Zambrano, Ghery; Reyes, Marisela del C.; Bellandi, Fernando; Contreras, Ricardo Rafael; Díaz, Juan C.; Cancines, Pedro I.; Fonseca V., Yuraima J.; Romero C., Isolda Trans-bis(sodium pyridine-p-sulphonate)tetracarbonylmolybdenum(0) complex, (trans-Mo(CO)4(p-PySO3Na)2, (1)) was used as a catalytic precursor for the 1- hexene hydroformylation reaction, in biphasic toluene/water medium (T = 100ºC, syngas total pressure = 600 psi, pH2/pCO = 1). Complex (1) showed good activity favoring the linear aldehyde. Likewise as other organic olefin substrates and with synthetic and real naphtha, good conversions to oxygenated products were obtained. Artículo Publicado en React.Kinet.Catal.Lett. Vol. 94, No. 1, 27−34 (2008) Sun, 12 Oct 2008 00:00:00 GMT http://www.saber.ula.ve/handle/123456789/33632 2008-10-12T00:00:00Z http://www.saber.ula.ve/handle/123456789/33631 Synthesis and characterization of trans-Mo(CO)4(p-C5NH4SO3Na)2 Suárez B., Trino; Fontal, Bernardo; Zambrano, Ghery; Reyes, Marisela del C.; Bellandi, Fernando; Contreras, Ricardo Rafael; Díaz, Juan C.; Cancines, Pedro I.; Fonseca V., Yuraima J.; Romero C., Isolda Reaction between Mo(CO)6 and p-C5NH4SO3Na (1:2 (Mo: p-C5NH4SO3Na) stoichiometric ratio) gave the trans-Mo(CO)4(p-C5NH4SO3Na)2 complex, (1), in 80% yield. Complex (1) has been characterized by FTIR, 1H and 13C NMR spectroscopy. Complex (1) has most likely an idealized D4h geometry with trans N-bound p-C5NH4SO3Na ligands. Artículo Publicado en React.Kinet.Catal.Lett. Vol. 94, No. 1, 21−26 (2008) Wed, 12 Mar 2008 00:00:00 GMT http://www.saber.ula.ve/handle/123456789/33631 2008-03-12T00:00:00Z http://www.saber.ula.ve/handle/123456789/33603 Synthesis, characterization, and biphasic ionic liquid media 1-hexene hydrogenation reaction of RuCl2(DMSO)2(NC5H4CO2Na-3)2 Suárez B., Trino; Fontal, Bernardo; Vielma, Joel E.; Reyes, Marisela del C.; Bellandi, Fernando; Cancines, Pedro I.; Díaz, Juan C.; Fonseca V., Yuraima J. RuCl2(DMSO)2(NC5H4CO2Na-3)2 is very soluble in the ionic liquid (IL) 1-n-butyl-3-methylimidazolium tetrafluoroborate, [(BMIM)BF4]. The complex was prepared by reacting RuCl2(DMSO)4 with NC5H4CO2Na-3, sodium nicotinate, in toluene, and was characterized by spectroscopic methods. The complex catalyzes the hydrogenation of 1-hexene (600 psi H2, 100 C) in a two-phase system consisting of cyclohexane/[(BMIM)BF4] with 75% conversion in 24 h and modest substrate isomerization. The complex shows good stability and can be reused several times with little loss in activity. Wed, 01 Jun 2011 00:00:00 GMT http://www.saber.ula.ve/handle/123456789/33603 2011-06-01T00:00:00Z http://www.saber.ula.ve/handle/123456789/16277 Synthesis of light alkenes on manganese promoted. González, Sergio; Oliveros Bastidas, Alberto; Mora, Asiloé J.; Rodulfo Baechler, Serbia M. A.; Orozco, José; Fontal, Bernardo; Delgado, Gerzon Synthesis of light alkenes on manganese promoted. (González Cortés, Sergio Luis; Rodulfo Baechler, Serbia M. A.; Oliveros Bastidas, Alberto; Orozco, José; Fontal, Bernardo; Mora, Asiloé J.; Delgado, Gerzon) Abstract The light alkenes formation capacity and the interaction of Mn with Fe and Fe-Co of Fischer-Tropsch catalysts have been studied. The samples were characterized by X-ray diffraction and temperature-programmed reduction. It was found that Fe- Co-Mn has a better catalytic stability than the Fe-Mn catalyst. It is proposed that iron particle size and its interaction with oxide and carbide phases produced during the catalytic reaction are mainly responsible for the high activity and light alkene selectivity. This article was jointly published by Akadémiai Kiadó, Budapest and Kluwer Academic Publishers, Dordrecht React.Kinet.Catal.Lett. Vol. 75, No. 1, 3-12 (2002) Fri, 27 Apr 2007 09:00:00 GMT http://www.saber.ula.ve/handle/123456789/16277 2007-04-27T09:00:00Z