Metal affinity liquid membrane

Metal affinity liquid membrane, Part III: Characterization of transport selectivity

“…In the halide series, chloride has a medium trans influence, so it gives a relative positive charge over the metal, but it does not excessively weaken the trans Pd-C bonding of the benzyl group and is therefore stable enough to be used as carrier in SLM systems [18]. These surrounding ligands facilitate the interaction of anionic species over the metallic center, as has been previously demonstrated [17,19], and we presume a special affinity of this carrier for analytes of aromatic nature because of the benzyl and phenyl groups.…”

“…This palladium-containing carrier (BPP-Pd(II)) interacts with the amino acids by their amino group and the carrier is thus stabilized with a negatively charged ligand [19]. Because of this, amino acid bi-deprotonated at both the amino and at the carboxylate groups interacts better with the palladium center of BPP-Pd(II).…”