The Experts below are selected from a list of 8118 Experts worldwide ranked by ideXlab platform
Sébastien Thibaudeau - One of the best experts on this subject based on the ideXlab platform.
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Superacid synthesized tertiary benzenesulfonamides and benzofuzed sultams act as selective hca ix inhibitors toward understanding a new mode of inhibition by tertiary sulfonamides
ChemInform, 2014Co-Authors: Benoit Metayer, Agnes Martinmingot, Daniella Vullo, Claudiu T Supuran, Sébastien ThibaudeauAbstract:A series of tertiary, fluorinated benzenesulfamides (II) is synthesized in Superacid HSbF6.
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selective synthesis of gem chlorofluorinated nitrogen containing derivatives after superelectrophilic activation in Superacid hf sbf5
Journal of Organic Chemistry, 2011Co-Authors: Fei Liu, Marie-paule Jouannetaud, Fabien Zunino, Agnes Martinmingot, Christian Bachmann, Gilles Frapper, Sébastien ThibaudeauAbstract:The first direct selective synthesis of novel gem-chlorofluorinated nitrogen-containing building blocks in Superacid is reported. The dramatic role of the chlorine atom on the reaction is shown by in situ NMR experiments and allows the involvement of a novel original superelectrophilic activation process in Superacid HF/SbF5 to be postulated.
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Superelectrophilic Activation in Superacid HF/SbF5 and Synthesis of Benzofused Sultams
Organic letters, 2010Co-Authors: Fei Liu, Agnès Martin-mingot, Marie-paule Jouannetaud, Fabien Zunino, Sébastien ThibaudeauAbstract:The synthesis of benzofused sultams and/or fluorinated sulfonamides, starting from N-allylic sulfonamides, was performed in Superacid HF/SbF5, through superelectrophilic activation. A dramatic effect of Superacid composition on the selectivity of the reaction was shown and applied to the synthesis of cyclic 4-aminobenzenesulfonamides.
John D Murphy - One of the best experts on this subject based on the ideXlab platform.
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Superacid derived surface passivation for measurement of ultra long lifetimes in silicon photovoltaic materials
Solar Energy Materials and Solar Cells, 2018Co-Authors: Alex I Pointon, Nicholas E Grant, Eve C Wheelerjones, Pietro P Altermatt, John D MurphyAbstract:Accurate measurements of bulk minority carrier lifetime are essential in order to determine the true limit of silicon's performance and to improve solar cell production processes. The thin film which forms when silicon wafers are dipped in solutions containing Superacids such as bis(trifluoromethane)sulfonimide (TFSI) has recently been found to be effective at electronically passivating the silicon surface. In this paper we first study the role of the solvent in which TFSI is dissolved for the passivation process. We study ten solvents with a wide range of relative polarities, finding TFSI dissolved in hexane provides improved temporal stability, marginally better passivation and improved solution longevity compared to dichloroethane which has been used previously. Sample storage conditions, particularly humidity, can strongly influence the passivation stability. The optimised TFSI-hexane passivation scheme is then applied to a set of 3 Ω cm n-type wafers cut from the same float-zone ingot to have different thicknesses. This enables the reproducibility of the scheme to be systematically evaluated. At 1015 cm−3 injection the best case effective surface recombination velocity is 0.69 ± 0.04 cm/s, with bulk lifetimes measured up to the intrinsic lifetime limit at high injection and > 43 ms at lower injection. Immersion of silicon in Superacid-based ionic solutions therefore provides excellent surface passivation, and, as it is applied at room temperature, the effects on true bulk lifetime are minimal.
Fei Liu - One of the best experts on this subject based on the ideXlab platform.
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selective synthesis of gem chlorofluorinated nitrogen containing derivatives after superelectrophilic activation in Superacid hf sbf5
Journal of Organic Chemistry, 2011Co-Authors: Fei Liu, Marie-paule Jouannetaud, Fabien Zunino, Agnes Martinmingot, Christian Bachmann, Gilles Frapper, Sébastien ThibaudeauAbstract:The first direct selective synthesis of novel gem-chlorofluorinated nitrogen-containing building blocks in Superacid is reported. The dramatic role of the chlorine atom on the reaction is shown by in situ NMR experiments and allows the involvement of a novel original superelectrophilic activation process in Superacid HF/SbF5 to be postulated.
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Superelectrophilic Activation in Superacid HF/SbF5 and Synthesis of Benzofused Sultams
Organic letters, 2010Co-Authors: Fei Liu, Agnès Martin-mingot, Marie-paule Jouannetaud, Fabien Zunino, Sébastien ThibaudeauAbstract:The synthesis of benzofused sultams and/or fluorinated sulfonamides, starting from N-allylic sulfonamides, was performed in Superacid HF/SbF5, through superelectrophilic activation. A dramatic effect of Superacid composition on the selectivity of the reaction was shown and applied to the synthesis of cyclic 4-aminobenzenesulfonamides.
Alex I Pointon - One of the best experts on this subject based on the ideXlab platform.
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Superacid derived surface passivation for measurement of ultra long lifetimes in silicon photovoltaic materials
Solar Energy Materials and Solar Cells, 2018Co-Authors: Alex I Pointon, Nicholas E Grant, Eve C Wheelerjones, Pietro P Altermatt, John D MurphyAbstract:Accurate measurements of bulk minority carrier lifetime are essential in order to determine the true limit of silicon's performance and to improve solar cell production processes. The thin film which forms when silicon wafers are dipped in solutions containing Superacids such as bis(trifluoromethane)sulfonimide (TFSI) has recently been found to be effective at electronically passivating the silicon surface. In this paper we first study the role of the solvent in which TFSI is dissolved for the passivation process. We study ten solvents with a wide range of relative polarities, finding TFSI dissolved in hexane provides improved temporal stability, marginally better passivation and improved solution longevity compared to dichloroethane which has been used previously. Sample storage conditions, particularly humidity, can strongly influence the passivation stability. The optimised TFSI-hexane passivation scheme is then applied to a set of 3 Ω cm n-type wafers cut from the same float-zone ingot to have different thicknesses. This enables the reproducibility of the scheme to be systematically evaluated. At 1015 cm−3 injection the best case effective surface recombination velocity is 0.69 ± 0.04 cm/s, with bulk lifetimes measured up to the intrinsic lifetime limit at high injection and > 43 ms at lower injection. Immersion of silicon in Superacid-based ionic solutions therefore provides excellent surface passivation, and, as it is applied at room temperature, the effects on true bulk lifetime are minimal.
Fabien Zunino - One of the best experts on this subject based on the ideXlab platform.
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selective synthesis of gem chlorofluorinated nitrogen containing derivatives after superelectrophilic activation in Superacid hf sbf5
Journal of Organic Chemistry, 2011Co-Authors: Fei Liu, Marie-paule Jouannetaud, Fabien Zunino, Agnes Martinmingot, Christian Bachmann, Gilles Frapper, Sébastien ThibaudeauAbstract:The first direct selective synthesis of novel gem-chlorofluorinated nitrogen-containing building blocks in Superacid is reported. The dramatic role of the chlorine atom on the reaction is shown by in situ NMR experiments and allows the involvement of a novel original superelectrophilic activation process in Superacid HF/SbF5 to be postulated.
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Superelectrophilic Activation in Superacid HF/SbF5 and Synthesis of Benzofused Sultams
Organic letters, 2010Co-Authors: Fei Liu, Agnès Martin-mingot, Marie-paule Jouannetaud, Fabien Zunino, Sébastien ThibaudeauAbstract:The synthesis of benzofused sultams and/or fluorinated sulfonamides, starting from N-allylic sulfonamides, was performed in Superacid HF/SbF5, through superelectrophilic activation. A dramatic effect of Superacid composition on the selectivity of the reaction was shown and applied to the synthesis of cyclic 4-aminobenzenesulfonamides.
