Peculiarities of K₂PdCl₄ and K₂PtCl₄ Complexation with Polymer-Supported Dibenzo-18-crown-6

Abstract

Dibenzo-18-crown-6 supported on a styrene-divinylbenzene copolymer matrix (PDB18C6) was found to be an efficient sorbent of Pd(II) and Pt(II) from aqueous K 2 PdCl 4 and K 2 PtCl 4 solutions, respectively, because of formation of complex ion pairs where K + was coordinated with the crown ether moiety while the platinides(II) were present in the paired anionic species. Sorption stoichiometry and binding constants determined for the interaction of PDB18C6 with K 2 PdCl 4 and K 2 PtCl 4 were distinctive. On the basis of spectral characteristics (electronic absorption and IR) obtained for the immobilized complexes, Pt(II) was assumed to be sorbed as anion [PtCl 4 ] 2while Pd(II) formed multinuclear species [Pd n Cl 2n+2 ] 2-. Within the complex ion pairs, Pd(II), in contrast with Pt(II), may interact with the aromatic substituents of the immobilized DB18C6.

Single-Particle Insights into Plasmonic Hot Carrier Separation Augmenting Photoelectrochemical Ethanol Oxidation with Photocatalytically Synthesized Pd–Au Bimetallic Nanorods

“…Black corresponds to the bare AuNR seeds in 16% MeOH and 20 mM HCl. Here, MeOH acted as a sacrificial hole scavenger, , and HCl provided solvated Cl – anions to prevent hydrolysis/oxolation of H 2 PdCl 4 (not present at this step) into PdO x . Blue indicates the AuNR solution (with MeOH and HCl) after complexing with added [PdCl 4 ] 2– in the dark for 1 h at a 1:5 Pd:Au atomic ratio, shown by Ortiz et al to exhibit optimal photocatalytic performance.…”

Synthesis of ion-selective polymer-supported crown ethers: a review

“…6) [31]. The piperazine is first bonded to chloromethylated crosslinked polystyrene and the dibenzocrown ether then immobilized onto it by reaction with formaldehyde.…”

Proposing Efficient New Pendant Group Polymer Electrolyte Membranes for Fuel Cells: A Computational Study

“…The pendant groups in question have (i) one, (ii) two, and (iii) three nitrogen atoms in 18-crown 6-ethers. Reports detailing the preparation of nitrogen containing crown ethers exist in the literature. − Moreover, there exist synthetic strategies − for post-functionalization reactions where a polymer backbone bearing a reactive group, such as −CH 2 Cl, − can react with a group on the crown ether (such as an amine) in order to create pendant crown ethers bound to a polymer backbone. This indicates that the experimental synthesis of the proposed PEMs would be a very feasible process.…”