Showing papers by "Alison M. Funston published in 2005"
TL;DR: The ultrafast molecular dynamics of five pyrrolidinium cation room temperature ionic liquids are investigated using femtosecond optical heterodyne-detected Raman-induced Kerr effect spectroscopy and the slow relaxation time constant correlates with the viscosity.
Abstract: We have investigated the ultrafast molecular dynamics of five pyrrolidinium cation room temperature ionic liquids using femtosecond optical heterodyne-detected Raman-induced Kerr effect spectroscopy. The ionic liquids studied are N-butyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide P14+∕NTf2−), N-methoxyethyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide P1EOE+∕NTf2−), N-ethoxyethyl-N-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide P1EOE+∕NTf2−), N-ethoxyethyl-N-methylpyrrolidinium bromideP1EOE+, and N-ethoxyethyl-N-methylpyrrolidinium dicyanoamide P1EOE+∕DCA−). For comparing dynamics among the five ionic liquids, we categorize the ionic liquids into two groups. One group of liquids comprises the three pyrrolidinium cations P14+, P1EOM+, and P1EOE+ paired with the NTf2− anion. The other group of liquids consists of the P1EOE+ cation paired with each of the three anions NTf2−,Br−, and DCA−. The overdamped relaxation for time scales longer than 2 ps has been fit by a triexponentia...
157 citations
TL;DR: One-electron reduction of the "extended viologen" dication 1 yields the red cation radical 2, characterized by strong near-IR absorption, which has been generated and studied by pulse radiolytic, electrochemical, redox titration, UV-visible, and electron paramagnetic resonance spectroscopic methods.
Abstract: One-electron reduction of the "extended viologen" dication 1 yields the red cation radical 2, characterized by strong near-IR absorption. It has been generated and studied by pulse radiolytic, electrochemical, redox titration, UV-visible, and electron paramagnetic resonance spectroscopic methods. All results are in agreement with a fully delocalized electronic structure for 2.
42 citations
01 Jan 2005
TL;DR: Pulse radiolysis and laser flash photolysis have been used to study solvation processes in quaternary ammonium ionic liquids, which extend into the nanosecond regime and influence the reactivity and energetics of radiolytically generated excess electrons as mentioned in this paper.
Abstract: Pulse radiolysis and laser flash photolysis are complementary tools for studying fast reactions in ionic liquids. Both techniques have been used to study solvation processes in quaternary ammonium ionic liquids, which extend into the nanosecond regime and influence the reactivity and energetics of radiolytically-generated excess electrons. The preparation and properties of ionic liquid families designed to further these studies is reported.
22 citations
TL;DR: In this paper, the UV-visible spectroscopy and photochemistry of [Co(en)2(DPPZ)](ClO4)3 (DPPZ = dipyrido[3,2-a:2´,3´-c]-phenazine) in the presence of plasmid DNA and the nucleoside 2´-deoxygaunosine have been investigated.
Abstract: The UV-visible spectroscopy and photochemistry of [Co(en)2(DPPZ)](ClO4)3 (DPPZ = dipyrido[3,2-a:2´,3´-c]-phenazine) in the presence of plasmid DNA and the nucleoside 2´-deoxygaunosine have been investigated. Evidence for the intercalation of the complex with DNA and photoinduced DNA strand breakage is found. The structurally related complexes [Co(en)2(DPPN)]Cl3 and [Co(en)2(DPPA)]Cl2, where DPPN = benzo[i]dipyrido[3,2-a:2´,3´-c]phenazine and DPPA = dipyrido[3,2-a:2´,3´-c] phenazine-11-carboxylic acid, have also been synthesized and characterized. In vitro cytotoxicity studies and photocytotoxicity studies of the complexes using the C6 rat glioma cell line are reported and indicate significant increases in toxicity following irradation.
13 citations
TL;DR: In this paper, it was shown that the addition of a large concentration of toluene or benzene to solutions of 1,2-dichloroethane can increase the yield of solute radical cations by a factor of 2.5.
11 citations
TL;DR: Pulse radiolysis and laser flash photolysis have been used to study solvation processes in quaternary ammonium ionic liquids, which extend into the nanosecond regime and influence the reactivity and energetics of radiolytically generated excess electrons as mentioned in this paper.
Abstract: Pulse radiolysis and laser flash photolysis are complementary tools for studying fast reactions in ionic liquids. Both techniques have been used to study solvation processes in quaternary ammonium ionic liquids, which extend into the nanosecond regime and influence the reactivity and energetics of radiolytically-generated excess electrons. The preparation and properties of ionic liquid families designed to further these studies is reported.
4 citations