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- W2016759318 abstract "The facilitated ion-transfer processes of Ca2+, Sr2+, and Ba2+ cations from an aqueous phase to a 1,2-dichloroethane (DCE) phase by naphtho-15-crown-5 (N15C5) were studied by cyclic voltammetry. When the metal ion concentrations in the aqueous phase were much higher than the N15C5 concentrations in the organic phase clear voltammograms were observed: the peak currents were controlled by the diffusion of N15C5 in the DCE phase. The diffusion coefficient of N15C5 in the DCE phase was evaluated to be 5.3×10−6 cm2 s−1. The analyses of these voltammograms revealed that the transfer of Ca2+ cation was facilitated due to the formation of 1:2 complex of cation to ligand ratio, Ca(N15C5)22+ and Sr2+ and Ba2+ cations were facilitated due to the formation of 1:1 complexes, Sr(N15C5)2+ and Ba(N15C5)2+, respectively. The stoichiometries of the complexes were also studied by electrospray ionization mass spectrometry (ESI-MS). Both 1:1 and 1:2 complexes were observed at low concentration of N15C5 for the Ca2+–N15C5 system. At high concentration of N15C5, only 1:2 complex was observed. In the cases of Sr2+–N15C5 and Ba2+–N15C5 systems, no signal was observed at low concentration of N15C5 whereas, at high concentration of N15C5, both 1:1 and 1:2 complexes were observed for the Sr2+–N15C5 system and only 1:1 complex was observed for the Ba2+–N15C5 system. Comparing the intensities in the ESI-MS spectra, the stabilities of different complexes in the gas phase were discussed." @default.
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- W2016759318 title "Facilitated ion-transfer of alkaline-earth metal cations by naphtho-15-crown-5 across the water ∣ 1,2-dichloroethane interface: voltammetric and electrospray ionization mass spectrometric studies" @default.
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- W2016759318 doi "https://doi.org/10.1016/s0013-4686(01)00786-1" @default.
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