Spectroscopic Studies for Molecular Structure and Complexation of Silver Polymer Electrolytes

Abstract

Polymer electrolytes containing silver ions have the potential to facilitate transport in membranes for separating olefin/paraffin mixtures. In the present study, the formation of AgBF4 and AgCF3SO3 complexes with poly(2-ethyl-2-oxazoline) (POZ) and poly(N-vinylpyrrolidone) (PVP) was investigated by spectroscopic methods. The carbonyl absorption bands of the infrared and Raman spectra of POZ and PVP with the silver salts confirm complex formation between silver ions and carbonyl oxygens. The symmetric stretching modes for SO3 of AgCF3SO3 complexed with PVP were analyzed in terms of "free" anions, ion pairs, and higher-order ion aggregates. The results suggest that the coordination number of silver ion with carbonyl oxygen of POZ and PVP is close to unity, demonstrating unusually high solubility of silver ions in the POZ and PVP matrices. Above the solubility limit, the ion pair and higher-order ion aggregates start to form.

Silver polymer electrolyte membranes for facilitated olefint transport: carrier properties, transport mechanism and separation performance

“…In the case of olefin/ paraffin separation, transition metal ions such as silver or copper ions dissolved in a polymeric matrix have been used as an olefin carrier because they reversibly react with olefin compound, resulting in facilitated olefin transport. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] In the following section, the properties of silver polymer electrolytes as olefin carrier will be reviewed, highlighting the formation and the structures of silver polymer electrolytes and their interaction with olefins.…”

“…In order to dissolve metal salts into metal ions, a polymer solvent having appropriate ligands (L) to coordinatively interact with metal ions is necessary. 17 Formation process of polymer electrolytes can be schematically written as eq. (1): (1) where L denotes a polymeric repeating unit, and M and X are a metal ion and its counteranion, respectively.…”

A Comparison Method of Silver Nanoparticles Prepared by the Gamma Irradiation and in situ Reduction Methods

“…[1][2][3] During the past decades, various methods have been studied [4][5][6][7][8] in this regard. Recently, particular attention has been paid to metal-polymer nanocomposites because of their optical, electrical, and mechanical properties.…”

Complexation of Silver Ions with Poly(butyl methacrylate) and Propylene Toward Facilitated Propylene Transport

“…Thus, three different ionic constituents are present depending on the bond strength: free ion, contact ion pair and ionic aggregates. [6] Each ionic constituent can be readily characterized by the corresponding Raman peak. It is known that the symmetric SO 3 Raman stretching mode is useful to identify free ions, ion pairs, and higher ionic aggregates, providing quantitative information on the dissociation and association behavior of salts.…”