(Methylthio)methyl and (N,N-Dimethylcarbamoyl)methyl Upper-Rim-Substituted Calix[4]arenes as Potential Extractants for Ag(I), Hg(II), Ni(II), Pd(II), Pt(II), and Au(III)

Abstract

The (methylthio)methyl and (N,N-dimethylcarbamoyl)methylcalix[4]arenes act as extracts for the transfer of Pd(II) and Au(III) from an aqueous to a chloroform layer.

Upper Rim Thioether Derivatives of Calix[4,6]Arenes: Extraction of Fission Pd(II) and Ag(I)

“…[17] The latter are likely to be involved in the Ag extraction (11%) by unsubstituted calix [4]arenes. [13] As observed for ungrafted sulfides (OBS . DBS), the extraction by calix [4,6]arenes decreases when changing S-alkyl to S-aryl substituents (1a, 1b .…”

“…According to, [13] the analogue of 1a with methoxy group at the narrow rim (cone 58%, partial cone 42%) extracts Ag Upper Rim Thioether Derivatives 785 Table 1. Compositions of the Pd and Ag extracts for IR-spectroscopy.…”

“…Hg ) Ni, Pb, Cd). [9 -11] The wide rim S-derivatives of calix [4]arenes [13] with OH and OMe groups at the narrow rim are conformationally labile, [14,15] and display anomalously low extraction of Ag. On the other hand, they completely extract Pd.…”

Calixarene-Based Molecules for Cation Recognition

“…Thiocarbamoyl groups [159,160] or dithiocarbamoyl groups when attached to the calixarene skeleton such as in ligand 30 [161,162] provide selectivity for Ag + , Pd 2+ , Hg 2+ and other 'soft' metal ions over 'hard' ones.…”

Synthesis of polyimide from 5,5″-bis(bromomethyl)-2,2′:6′,2″-terpyridine and investigation of the polymer sorption behavior towards some metal ions

“…In order to circumvent the use of such chemicals liquid-liquid extraction, as well as solid-phase extraction (SPE) techniques applying numerous sorbents, have already been developed. Polymer-supported extractants, usually based on PS-DVB or some methacrylates suffer from insufficient selectivity and reduced chemical stability in the extraction media [6,7].…”