engleski

Metal complexation of thiacrown ether macrocycles by electrospray ionization mass spectrometry

In the present study, electrospray ionization mass spectrometry is used to evaluate the metal-binding selectivities of an array. of novel caged macrocycles for mercury(II), lead(II), cadmium(II), and zinc(II). ions. In homogeneous methanol/chloroform. solutions. as well as, extractions of metals from aqueous solution by. macrocycles in chloroform, it is found that the type of heteroatom (S, O, N), cavity, size, and presence of other substituents. influence the, metal selectivities. Several of the macrocycles in this study bind mercury ion selectively and efficiently in the presence of many other metal ions and have, an avidity toward mercury that was tunable by the size and combination of heteroatoms in the macrocycle ring and the number of cage groups attached. The extraction mechanism was further investigated by determining the variation in extraction selectivity as a function of the counterions of the mercury salts.

Quadrupole ion-trap; Caged crown ligands; Binding selectivities; Aqueous-solutions; Extraction; Constants; Mercury

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