TY - JOUR
T1 - Quantitative nmr spectrometry of phase-transfer catalysts. Part 2. Formate Selective Extraction Constants
AU - Bar, Raphael
AU - Karpuj-Bar, Liliana
AU - Sasson, Yoel
AU - Blum, Jochanan
PY - 1983
Y1 - 1983
N2 - Selective extraction constants (Kex(s)) of aqueous sodium formate in the presence of organic solvents and tetraalkylammonium salts were obtained by 300-MHz n.m.r. measurements; data are given for two-phase liquid systems containing chloroform and tetra-butyl-, -hexyl-, -heptyl-, -octyl-, and -dodecylammonium bromides. The values decrease with an increase in the alkyl chain length. The dependence of Kex(s) on formate concentration was studied in a water-dichloromethane system. Bromide, chloride and sulfate ions were found to have greater affinities than formate for the extracting quaternary ammonium cations.
AB - Selective extraction constants (Kex(s)) of aqueous sodium formate in the presence of organic solvents and tetraalkylammonium salts were obtained by 300-MHz n.m.r. measurements; data are given for two-phase liquid systems containing chloroform and tetra-butyl-, -hexyl-, -heptyl-, -octyl-, and -dodecylammonium bromides. The values decrease with an increase in the alkyl chain length. The dependence of Kex(s) on formate concentration was studied in a water-dichloromethane system. Bromide, chloride and sulfate ions were found to have greater affinities than formate for the extracting quaternary ammonium cations.
UR - http://www.scopus.com/inward/record.url?scp=0040480948&partnerID=8YFLogxK
U2 - 10.1016/0003-2670(83)80033-6
DO - 10.1016/0003-2670(83)80033-6
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AN - SCOPUS:0040480948
SN - 0003-2670
VL - 154
SP - 313
EP - 317
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - C
ER -