Browsing by Author "De la Fuente, Julio R."
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- ItemModulation of lactam-lactim tautomerism of quinoxalin-2-one induced by cucurbit[7]uril : a comparative study with oxazin-2-one(2018) Aliaga Miranda, Margarita Elly; De la Fuente, Julio R.; García Rio, Luis; Rojas Romo, Carlos Roberto; Uribe Venegas, Iván Antonio; Díaz Hernández, Dafne; Fierro Huerta, Angélica; Cañete Molina, Álvaro
- ItemPhotoreduction of Oxoisoaporphines by Amines : Laser Flash and Steady-State Photolysis, Pulse Radiolysis, and TD-DFT Studies(2009) De la Fuente, Julio R.; Aliaga, Christian; Poblete, Cristian; Zapata, Gerald; Jullian, Carolina; Saitz Barría, Claudio Antonio; Cañete Molina, Álvaro; Kciuk, Gabriel; Sobarzo Sánchez, Eduardo; Bobrowski, Krzysztof
- ItemRadical Ions of 3-Styryl-quinoxalin-2-one derivatives studied by pulse radiolysis in organic solvents(2018) Skotnicki, Konrad; De la Fuente, Julio R.; Cañete Molina, Álvaro; Berrios, Eduardo; Bobrowski, Krzysztof
- ItemSpectral and Kinetic Study of 3-Styrylquinoxalin-2(1H)-ones Photoreduced by N-Phenylglycine and Amines(2019) Diaz-Hernandez, Dafne; Canete, Alvaro; Pavez, Lynda; Perez-Sanhueza, Alberto; Gunther, German; Szreder, Tomasz; De la Fuente, Julio R.The photoreduction by amines and N-phenyl-glycine, NPG, of six styrylquinoxalin-2(1H)-ones derivatives substituted in the styryl moiety, R-SQ was studied by using flash photolysis. The photoreaction is initiated via a single electron transfer from the electron donor (amines or NPG) to R-SQ excited triplet state, R-3-SQ*, with the formation of a triplet state radical ion pair or a charge transfer exciplex, (3)[CRIP/CTE]. These species live longer than the respective R-3-SQ* and have very similar transient spectra. In the presence of NPG, these (3)[CRIP/CTE] evolve on mu s time scale to the respective hydrogenated radicals, R-SQH(center dot), whose transient spectra and reaction rate constants with NPG are reported. The identity of these hydrogenated radicals was supported by the spectra obtained with the alpha-H donor triethylamine and previous pulse radiolysis studies in 2-propanol. Our findings allow proposing a radical chain reaction mechanism that explains the observed spectral behavior and rationalizes formation of the main product formed by binding of four PhNHCH2 center dot derived from NPG decarboxylation.