Ohto K, Yamaga H, Murakami E, Inoue K
Department of Applied Chemistry, Faculty of Science and Engineering, Saga University, Honjo, Saga, Japan.
Talanta. 1997 Jun;44(6):1123-30. doi: 10.1016/s0039-9140(97)00019-2.
25,26,27,28-tetrakis(N,N-diethylaminocarbonylmethoxy)-5,11,17,23-tetrakis(1,1,3,3-tetramethylbutyl)calix[4]arene, a macrocyclic extraction reagent, and p-(1,1,3,3-tetra-methylbutyl)phenoxymethyl-N,N-diethylamide, an acyclic extraction reagent corresponding to the former one, were synthesized to investigate their extraction behavior for silver(I), gold(III), palladium(II), and platinum(IV) from highly acidic solution into chloroform. In the extraction of silver and gold from hydrochloric acid solution, a completely different extraction behavior was observed between these two types of the reagents. The extraction behavior was examined in detail for silver and was found to be dependent on whether silver ion was extracted as a cationic species or a anionic species complexed with chloride ion. This was supported by proton nuclear magnetic resonance study of the calix[4]arene derivative. As a result, the extraction of silver ion with calix[4]arene derivative was very peculiar which was attributable to the fitting between cyclic size of calix[4]arene and ionic radius of silver.
合成了大环萃取剂25,26,27,28-四（N,N-二乙氨基羰基甲氧基）-5,11,17,23-四（1,1,3,3-四甲基丁基）杯[4]芳烃以及与其对应的开链萃取剂对（1,1,3,3-四甲基丁基）苯氧基甲基-N,N-二乙酰胺，以研究它们从高酸性溶液中向氯仿萃取银（I）、金（III）、钯（II）和铂（IV）的行为。在从盐酸溶液中萃取银和金时，观察到这两种试剂的萃取行为完全不同。对银的萃取行为进行了详细研究，发现其取决于银离子是以阳离子形式还是与氯离子络合的阴离子形式被萃取。杯[4]芳烃衍生物的质子核磁共振研究证实了这一点。结果，杯[4]芳烃衍生物对银离子的萃取非常特殊，这归因于杯[4]芳烃的环大小与银的离子半径相匹配。
