The Experts below are selected from a list of 84063 Experts worldwide ranked by ideXlab platform
Kimin Park - One of the best experts on this subject based on the ideXlab platform.
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cyclic and acyclic s2o2 donor type ionophores ion pair extraction and transport of ag i picrate and x ray confirmation of existence of the ion pair complex
Microchemical Journal, 2001Co-Authors: Il Yoon, Jong Hwa Jung, Kimin ParkAbstract:Extraction and transport behaviors of isomeric oxathia macrocycles (L 2 , ortho-; L 3 , meta- and L 4 , para-isomer) and their structure related Open-Chain Compound (L 1 ) towards Ag(I) picrate have been examined. From the plot of log (D Ag(I) /[pic - ]) vs. log [L] 0 for all of the ionophores were linear with slope near unity, thereby confirming the 1:1:1 complex formations of Ag(I)/ligand/picrate ion to be extracted into the dichloromethane phase. The extractability of an acyclic ionophore was superior to those of the corresponding cyclic ones. In membrane transport experiments, the slow rate of release of Ag(I) from the membrane into the receiving phase seems to be responsible for lower transport efficiency. Upon addition of sodium thiosulfate as a stripping reagent in receiving phase, the efficiency of transport is significantly enhanced in the order of L 1 (acyclic) > L 2 (ortho-) > L 3 (meta-) > L 4 (para-) in accordance with those of log K ex values. It is hypothesized that the ion-pair complexation of L 1 in extraction step would be more favorable in extraction and transport of Ag(I). Its structure have been confirmed by X-ray diffraction analysis of [Ag(L 1 )pic], where L 1 = 1,10-bis(mercaptobenzylyl)-4,7-dioxadecane.
Doron Aurbach - One of the best experts on this subject based on the ideXlab platform.
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On Li-chelating additives to electrolytes for Li batteries
Journal of Coordination Chemistry, 2004Co-Authors: Anatoly M. Belostotskii, Elena Markevich, Doron AurbachAbstract:The relative affinity of several electrochemically stable bi- and polydentate organic ligands (containing ether, amino, carbonate or phosphonate moieties) to Li ion was estimated by ab initio calculations at the MP2/6-31G(d) level comparing their calculated binding energies (BEs). Polyether 12-crown-4 and a bisphosphonate, which is covalently locked in a cyclic “chelating” conformation, are stronger Li+ chelators than isosparteine and 1,2-methylenebisphosphonate (an Open-Chain Compound). Organic biscarbonates are the weakest complexing agents among the ligands considered. Although BE values were calculated for the gas phase, the order of ligand complexation ability obtained is also considered relevant to solutions since the difference between the BEs for these three groups of ligands is significant. The same calculations that were performed for complexes of Li ion and different organic carbonate diesters (solvents usually used in Li-ion batteries) allowed singling out of conformationally locked bisphospho...
Il Yoon - One of the best experts on this subject based on the ideXlab platform.
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cyclic and acyclic s2o2 donor type ionophores ion pair extraction and transport of ag i picrate and x ray confirmation of existence of the ion pair complex
Microchemical Journal, 2001Co-Authors: Il Yoon, Jong Hwa Jung, Kimin ParkAbstract:Extraction and transport behaviors of isomeric oxathia macrocycles (L 2 , ortho-; L 3 , meta- and L 4 , para-isomer) and their structure related Open-Chain Compound (L 1 ) towards Ag(I) picrate have been examined. From the plot of log (D Ag(I) /[pic - ]) vs. log [L] 0 for all of the ionophores were linear with slope near unity, thereby confirming the 1:1:1 complex formations of Ag(I)/ligand/picrate ion to be extracted into the dichloromethane phase. The extractability of an acyclic ionophore was superior to those of the corresponding cyclic ones. In membrane transport experiments, the slow rate of release of Ag(I) from the membrane into the receiving phase seems to be responsible for lower transport efficiency. Upon addition of sodium thiosulfate as a stripping reagent in receiving phase, the efficiency of transport is significantly enhanced in the order of L 1 (acyclic) > L 2 (ortho-) > L 3 (meta-) > L 4 (para-) in accordance with those of log K ex values. It is hypothesized that the ion-pair complexation of L 1 in extraction step would be more favorable in extraction and transport of Ag(I). Its structure have been confirmed by X-ray diffraction analysis of [Ag(L 1 )pic], where L 1 = 1,10-bis(mercaptobenzylyl)-4,7-dioxadecane.
Anatoly M. Belostotskii - One of the best experts on this subject based on the ideXlab platform.
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On Li-chelating additives to electrolytes for Li batteries
Journal of Coordination Chemistry, 2004Co-Authors: Anatoly M. Belostotskii, Elena Markevich, Doron AurbachAbstract:The relative affinity of several electrochemically stable bi- and polydentate organic ligands (containing ether, amino, carbonate or phosphonate moieties) to Li ion was estimated by ab initio calculations at the MP2/6-31G(d) level comparing their calculated binding energies (BEs). Polyether 12-crown-4 and a bisphosphonate, which is covalently locked in a cyclic “chelating” conformation, are stronger Li+ chelators than isosparteine and 1,2-methylenebisphosphonate (an Open-Chain Compound). Organic biscarbonates are the weakest complexing agents among the ligands considered. Although BE values were calculated for the gas phase, the order of ligand complexation ability obtained is also considered relevant to solutions since the difference between the BEs for these three groups of ligands is significant. The same calculations that were performed for complexes of Li ion and different organic carbonate diesters (solvents usually used in Li-ion batteries) allowed singling out of conformationally locked bisphospho...
Jong Hwa Jung - One of the best experts on this subject based on the ideXlab platform.
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cyclic and acyclic s2o2 donor type ionophores ion pair extraction and transport of ag i picrate and x ray confirmation of existence of the ion pair complex
Microchemical Journal, 2001Co-Authors: Il Yoon, Jong Hwa Jung, Kimin ParkAbstract:Extraction and transport behaviors of isomeric oxathia macrocycles (L 2 , ortho-; L 3 , meta- and L 4 , para-isomer) and their structure related Open-Chain Compound (L 1 ) towards Ag(I) picrate have been examined. From the plot of log (D Ag(I) /[pic - ]) vs. log [L] 0 for all of the ionophores were linear with slope near unity, thereby confirming the 1:1:1 complex formations of Ag(I)/ligand/picrate ion to be extracted into the dichloromethane phase. The extractability of an acyclic ionophore was superior to those of the corresponding cyclic ones. In membrane transport experiments, the slow rate of release of Ag(I) from the membrane into the receiving phase seems to be responsible for lower transport efficiency. Upon addition of sodium thiosulfate as a stripping reagent in receiving phase, the efficiency of transport is significantly enhanced in the order of L 1 (acyclic) > L 2 (ortho-) > L 3 (meta-) > L 4 (para-) in accordance with those of log K ex values. It is hypothesized that the ion-pair complexation of L 1 in extraction step would be more favorable in extraction and transport of Ag(I). Its structure have been confirmed by X-ray diffraction analysis of [Ag(L 1 )pic], where L 1 = 1,10-bis(mercaptobenzylyl)-4,7-dioxadecane.
