Browsing by Author "Hurtado, John"
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Item Estudio electroquímico de Rojo de Pirogalol (RP) en presencia de surfactantes de diferente carga(Universidad Santiago de cali, 2012-09-01) Nagles, Edgar; Hurtado, John; Ríos, Roxana; Aracibia, VerónicaLa interacción de Rojo de Pirogalol (RP) con los surfactantes dodecil sulfato de sodio (SDS) y bromuro de cetilpiridinio (CPB) de carga negativa y positiva respectivamente fue estudiada por voltamperometría cíclica a pH 2,0 y 8,0 sobre electrodos serigrafiados de carbono. Su interacción y localización en los surfactantes fue estudiada por los cambios sufridos en las corrientes de pico a diferentes concentraciones de surfactantes observándose efectos catalíticos de corriente.Item New bis(azolylcarbonyl)pyridine chromium(III) complexes as initiators for ethylene polymerization(Inorganica Chimica, 2011) Hurtado, John; Ugarte, Javiera; Rojas, René; Valderrama, Mauricio; Carey, Desmond Mac-Leod; Muñoz-Castro, Alvaro; Arratia-Pérez, Ramiro; Fröhlich, RolandReaction of 2,6-pyridinedicarbonyl dichloride with 3,5-dimethylpyrazole and 1H-indazole, respectively, yield the tridentate ligands 2,6-bis(3,5-dimethylpyrazol-1-ylcarbonyl)pyridine (1) and 2,6-bis(indazol-1-ylcarbonyl)pyridine (2). The molecular structure of the new compound (2) was determined by single-crystal X-ray diffraction. These ligands react with CrCl3(THF)3 in THF to form neutral complexes of general formula [CrCl3{2,6-bis(azolylcarbonyl)pyridine-N,N,N}] (3, 4) which were isolated in high yield as air stable green solids and characterized by elemental analysis, magnetic moment, IR, and mass spectroscopies. 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 for the polymerization of ethylene.