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- W2016165089 abstract "The macrocyclic ether 1,4,7,10,13,16-hexaoxaoctadecane (18-crown-6) has the remarkable property of being able to transfer the hydronium (H 3 O + ) ion from an aqueous solution to an organic medium. This property has been used to synthetize a 1:1 stoichiometric complex of this ether with hydronium tetrafluoroborate. This complex is very stable (mp 145 °C) and dissolves readily, without decomposition, in solvents such as CHCl 3 . The presence of the H 3 O + and BF 4 − ions in the complex has been confirmed by chemical analysis, and by 1 H nmr, Raman, and ir spectroscopy. The vibrational spectra indicate that a conformational change of the crown ether takes place in the complex over the temperature range −50 °C to −100 °C. The symmetry of the crown ether, which appears to be relatively high at room temperature, is considerably reduced below the transition temperature." @default.
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- W2016165089 date "1982-04-01" @default.
- W2016165089 modified "2023-10-17" @default.
- W2016165089 title "Synthesis and vibrational study of a 1:1 stoichiometric complex of hydronium tetrafluoroborate and 1,4,7,10,13,16-hexaoxacyclooctadecane (18-crown-6)" @default.
- W2016165089 doi "https://doi.org/10.1139/v82-129" @default.
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