Liquid-liquid extraction of alkali metal ions with photochromic crowned spirobenzopyrans.
Liquid-liquid extraction of alkali metal ions with photochromic crowned spirobenzopyrans.
复制标题
用光致变色冠螺苯并吡喃液-液萃取碱金属离子。
DOI：
10.1021/ac020003p
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发表时间：
2002
影响因子：
7.4
通讯作者：
K. Kimura
中科院分区：
文献类型：
--
作者：
H. Sakamoto;Takashi Yokohata;T. Yamamura;K. Kimura
在1，2-二氯乙烷的液-液萃取条件下，冠醚衍生物的可萃取性顺序为：Li+ >> Na+ > K+ >或=四甲基铵离子（TMA+），Li+ > Na+ >> K+ > TMA+，Na+ > K+ >> Li+ > TMA+;单氮杂-15-冠-5，2和单氮杂-18-冠-6，3。1的离子选择性取决于单氮杂-12-冠-4的金属离子络合能力。即使是带有15-冠-5部分的2，也显示出Li+选择性，因为Li+与2的汞形式的酚盐离子的相互作用比Na+强得多。3的Na+选择性也归因于与汞形式的酚盐离子的离子相互作用，因为离子相互作用优选Na+而不是K+，而不管18-冠-6环本身对后者离子的更高亲和力。紫外光（300-400 nm）可促进Li+萃取到有机相中，而可见光（>500 nm）可抑制萃取。可见光照射对1的Li+络合能力的影响也用电喷雾电离质谱进行了研究。
On the liquid-liquid extraction using 1,2-dichloroethane as an organic solvent, the crowned spirobenzopyrans exhibited textractability in the following order: Li+ >> Na+ > K+ > or = tetramethylammonium ion (TMA+), Li+ > Na+ >> K+ > TMA+, and Na+ > K+ >> Li+ > TMA+ for spirobenzopyran derivatives bearing monoaza-12-crown-4, 1; monoaza-15-crown-5, 2; and monoaza-18-crown-6, 3; respectively, under dark conditions. The ion selectivity of 1 depends on the metal-ion complexing ability of monoaza-12-crown-4. Even 2, which carries a 15-crown-5 moiety, showed Li+ selectivity because of the much stronger interaction of Li+ with the phenolate ion of the merocyanine form of 2 than that of Na+. The Na+ selectivity of 3 is also attributed to the ionic interaction with the phenolate ion of the merocyanine form, since the ionic interaction prefers Na+ to K+ regardless of the higher affinity of the 18-crown-6 ring itself to the latter ion. The Li+ extraction into the organic phase with 1 was enhanced by UV irradiation (300-400 nm), while some depression in the extraction was found by visible irradiation (>500 nm). The effect of visible irradiation on the Li+ complexing ability of 1 was also examined with electrospray ionization mass spectrometry.