Abstract
The extraction of aluminium(III) with 2-methyl-8-quinolinol derivatives (HA), such as 2-methyl-8-quinolinol (HMQ), 2-methyl-5-methoxymethyl-8-quinolinol (HMO1Q), and 2-methyl-5-octyloxymethyl-8-quinolinol (HMO8Q), from a weakly acidic solution into heptane was studied in both the absence and presence of 3,5-dichlorophenol (Hdcp) as the synergist. In the absence of Hdcp, aluminium(III) was not extracted with HMQ and HMO1Q due to a steric hindrance of the methyl group at the 2-position at all, but was slightly extracted with HMO8Q. The unusual extraction behavior of aluminium(III) with HMO8Q should be ascribed to the formation of a hydrophobic aluminium(III)-HMO8Q complex. Aluminium(III) was quantitatively extracted with HA into heptane upon the addition of Hdcp. The large synergism of Hdcp was ascribed to the formation of an inner-sphere complex, Al(dcp)(A)2, in an aqueous phase and an outer-sphere complex, Al(dcp)(A)2·Hdcp, in the organic phase. The compositions of extracted aluminium(III)-HA-Hdcp were assigned to be Al(dcp)(A)2·Hdcp. The synergistic extraction constants (Kex,s = [Al(dcp)(A)2·Hdcp]org[H+]3[Al3+]-1[HA]org-2[Hdcp]org-2) for Al(dcp)(A)2·Hdcp are 10-5.75±0.12 (HMQ), 10-4.74±0.05 (HMO1Q), and 10-3.98±0.19 (HMO8Q), respectively, at I = 0.1 M (H, Na) ClO4 (1 M = 1 mol dm-3) and 25°C.
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Choi, SY., Imura, H. & Ohashi, K. Large Extractability of Aluminium(III) with 2-Methyl-8-quinolinol Derivatives in the Presence of 3,5-Dichlorophenol. ANAL. SCI. 16, 923–928 (2000). https://doi.org/10.2116/analsci.16.923
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DOI: https://doi.org/10.2116/analsci.16.923