Poly(styrene‐alt‐maleic acid)–metal complexes with divalent metal ions. synthesis, characterization, and physical properties

Abstract

Polymer-metal complexes of the alternating copolymer styrene and maleic acid with Cu(II), Co(II), Ni(II), and Zn(II) were synthesized and characterized by elemental analysis, infrarred and electronic spectra, and thermogravimetry. In addition, magnetic measurements were performed and the electrical conductivity was studied at different temperatures. Semiempirical calculations at the PM 3 level were carried out to elucidate the geometrical arrangement of the polychelates.

Synthesis and application of modified poly (styrene‐alt‐maleic anhydride) networks as a nano chelating resin for uptake of heavy metal ions

“…A number of chelating resins containing carboxylic acid groups, such as ethylenediamine tetraacetic acid, propylene diamine tetraacetic acid, imino diacetic acid, maleic acid‐functionalized XAD‐(CO)CH = CH‐COOH resin and N‐substituted diamides of malonic acid, have been prepared and studied for their analytical properties. Recently, poly (styrene‐alt‐maleic acid) has been synthesized and shown to be coordinated with metals through two carboxylic groups pertaining to two different polymer chains which indicate intermolecular complexation. Moreover, chelating resins with sulfur and nitrogen as donor atoms usually have excellent adsorption properties for mercury and noble metal ions …”

Temporal and spatial localization of three germline‐specific proteins in medaka

“…In the latter case, the polymer‐Cu 2+ complexation may be complicated by the two‐step dissociation of MAc,13, 14 accompanied by a conformational chain transition from a compact globule to an extended coil 15. Nevertheless, the complexation of metal ions with MAc units is of great interest, due to the structural characteristics of the (co)polymers, enabling the variation of the charge density along the chain or controlling the hydrophobic/hydrophilic balance using adequate comonomers, hydrophobic such as styrene16–20 ethylene,17, 21, 22 olefin23 and other functional comonomers like N ‐vinylimidazole,24 thiophene and furan25 or more hydrophilic ones such as acrylic acid,26, 27 styrene sulfonic acid (SSH)27, 28 and acrylamide 29. In many cases, the complexation of the carboxylate groups of MAc with Cu 2+ ions causes the contraction of the polymer chains, dehydration, decrease in solubility and, finally, precipitation.…”

“…For example, it has been shown that in the case of poly(maleic acid) about 66% of the carboxylate groups can coordinate to copper ions 31. Nevertheless, for copolymers of MAc with styrene,18 acrylic acid,26 or SSH28 the participation of only the first carboxylate group in the complex is claimed, when the complexation takes place in the acidic pH‐region.…”

Comparative study of electrostatic binding vs. complexation of Cu2+ ions with water‐soluble polymers containing styrene sulphonic acid and/or maleic acid units or their sodium salt forms

“…In many cases, the complexation of the carboxylate groups of MAc with Cu 2+ ions causes the contraction of the polymer chains, dehydration, decrease in solubility and, finally, precipitation. As a consequence, the complexation has been investigated by a large variety of techniques, both in the solid state18, 23, 26, 28 but also in solution 16, 17, 19, 21, 22, 27, 30. Among others, an important question raised in many of these studies is the stoichiometry of the interaction.…”

“…For example, it has been shown that in the case of poly(maleic acid) about 66% of the carboxylate groups can coordinate to copper ions. 31 Nevertheless, for copolymers of MAc with styrene, 18 acrylic acid, 26 or SSH 28 the participation of only the first carboxylate group in the complex is claimed, when the complexation takes place in the acidic pH-region.…”