Sanabria Edilma, Esteso Miguel A, Vargas Edgar F
Grupo GICRIM, Programa de Investigación Criminal, Universidad Manuela Beltrán, Avenida Circunvalar No. 60-00, Bogota 111321, Colombia.
Universidad Católica de Ávila, Calle los Canteros s/n, 05005 Ávila, Spain.
Toxics. 2022 Aug 9;10(8):461. doi: 10.3390/toxics10080461.
The complexing properties of two water-soluble resorcin[4]arenes (tetrasodium 5,11,17,23-tetrakissulfonatemethylen 2,8,14,20-tetra(butyl)resorcin[4]arene, NaBRA, and tetrasodium 5,11,17,23-tetrakissulfonatemethylen-2,8,14,20-tetra(2-(methylthio)ethyl)resorcin[4]arene, NaSRA) with polluting heavy metals such as Cu, Pb, Cd and Hg were studied by conductivity, and the findings were confirmed by using other techniques to try to apply this knowledge to removing them. The results indicate that NaBRA is able to complex Cu in a 1:1 ratio and Pb in a 1:2 ratio, while NaSRA complexes Hg in a 1:1 ratio. On the contrary, no indications have been observed that either of the resorcin[4]arenes studied complexes the Cd ions. The results suggest that the bonds established between the sulfur atoms located at the lower edge of the SRA and the solvent hydrogens could prevent the entry of the guest into the host cavity. However, in the case of Hg ions, the entry is favoured by the interactions between the sulfur donor atoms present on the lower edge of NaSRA and the Hg ions. Therefore, it can be said that NaBRA is selective for Cu and Pb ions and NaSRA is selective for Hg ions.
通过电导率研究了两种水溶性间苯二酚[4]芳烃（5,11,17,23-四磺酸甲酯基-2,8,14,20-四（丁基）间苯二酚[4]芳烃四钠盐，NaBRA，以及5,11,17,23-四磺酸甲酯基-2,8,14,20-四（2-（甲硫基）乙基）间苯二酚[4]芳烃四钠盐，NaSRA）与铜、铅、镉和汞等污染重金属的络合性能，并通过使用其他技术对结果进行了确认，以期将这一知识应用于去除这些重金属。结果表明，NaBRA能够以1:1的比例络合铜，以1:2的比例络合铅，而NaSRA以1:1的比例络合汞。相反，未观察到所研究的任何一种间苯二酚[4]芳烃络合镉离子的迹象。结果表明，位于SRA下缘的硫原子与溶剂氢之间形成的键可能会阻止客体进入主体空腔。然而，对于汞离子而言，NaSRA下缘存在的硫供体原子与汞离子之间的相互作用有利于汞离子进入。因此，可以说NaBRA对铜离子和铅离子具有选择性，而NaSRA对汞离子具有选择性。
