Large Extractability of Aluminium(III) with 2-Methyl-8-quinolinol Derivatives in the Presence of 3,5-Dichlorophenol
Large Extractability of Aluminium(III) with 2-Methyl-8-quinolinol Derivatives in the Presence of 3,5-Dichlorophenol
复制标题
3,5-二氯苯酚存在下，2-甲基-8-羟基喹啉衍生物对铝(III)的高萃取率
DOI：
10.2116/analsci.16.923
复制
发表时间：
2000
影响因子：
1.6
通讯作者：
K. Ohashi
中科院分区：
文献类型：
--
作者：
Sung;H. Imura;K. Ohashi
研究了2-甲基-8-羟基喹啉衍生物（HA），如2-甲基-8-羟基喹啉（HMQ），2-甲基-5-甲氧基甲基-8-羟基喹啉（HMO_1Q）和2-甲基-5-辛氧基甲基-8-羟基喹啉（HMO_8Q）在3，5-二氯苯酚（Hdcp）存在和不存在下从弱酸性溶液中萃取铝（III）的行为。在不存在Hdcp的情况下，铝（III）不被HMQ和HMO_1Q萃取，这是由于在2-位的甲基的空间位阻，但被HMO_8Q略微萃取。Al（Ⅲ）与HMO_8Q形成疏水络合物是Al（Ⅲ）与HMO_8Q萃取Al（Ⅲ）的原因。加入HDCP后，用HA将铝（III）定量萃取到庚烷中。Hdcp在水相中形成内球配合物Al（dcp）（A）_2，在有机相中形成外球配合物Al（dcp）（A）_2·Hdcp。Al（Ⅲ）-HA-Hdcp萃取物的组成为Al（dcp）（A）_2·Hdcp。协同萃取常数（K _ex，s = [Al（dcp）（A）_2·Hdcp]_org[H^+]^3 [Al^3+]^-1[HA]_org^-2[Hdcp]_org^-2）分别为10^-5.75±0.12（HMQ）、10^-4.74±0.05（HMO_1Q）和10^-3.98±0.19（HMO_8Q），在I = 0.1 M（H，Na）ClO_4（1 M = 1 mol dm^-3）和25°C下。
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 (HMO_1Q), and 2-methyl-5-octyloxymethyl-8-quinolinol (HMO_8Q), 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 HMO_1Q due to a steric hindrance of the methyl group at the 2-position at all, but was slightly extracted with HMO_8Q. The unusual extraction behavior of aluminium(III) with HMO_8Q should be ascribed to the formation of a hydrophobic aluminium(III)-HMO_8Q 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 ( K _ex,s = [Al(dcp)(A)_2·Hdcp]_org[H^+]^3[Al^3+]^-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 (HMO_1Q), and 10^-3.98±0.19 (HMO_8Q), respectively, at I = 0.1 M (H, Na) ClO_4 (1 M = 1 mol dm^-3) and 25°C.
用 7-溴-8-羟基喹啉衍生物萃取钼(VI)
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
E. Fujimine;A. Ohashi;H. Imura;K. Ohashi
通讯作者：
K. Ohashi