Synthesis and Ion-Complexing Properties of a Novel Polymer-Supported Reagent with Diphosphonate Ligands

Abstract

A new chelating resin with diphosphonate groups has been synthesized from the tetraethyl ester of 1,1-vinylidenediphosphonic acid. Comonomers such as acrylonitrile allow the sterically hindered monomer to be incorporated into the polymer network. A copolymer was prepared by suspension polymerization in high yield with diphosphonate, acrylonitrile, and styrene in the monomer solution at a 4.5:1:3.1 weight ratio and 5 wt % divinylbenzene as the cross-link agent. Bifunctionality enhances metal ion complexation kinetics. The diphosphonate ligands are selective chelators, while sulfonic acid ligands covalently bound to the phenyl groups enhance the accessibility of metal ions in the polymer matrix. The complexing ability of the polymer is studied with Eu(III) as the target ion in 0.04−4.0 N HNO3 solutions in both the presence and absence of 0.40 N NaNO3. A sulfonic acid ion exchange resin complexes 14.3% Eu(III) while the diphosphonate-based polymer complexes 96.5% from a 1 N HNO3/0.4 N NaNO3 solution.

Immobilization of lithium-selective 14-crown-4 on crosslinked polymer supports

“…The resin (2) was then contacted with 10 K4 N Li C , but no sorption of the ion from solution was observed. Since this may be a result of the resin's hydrophobicity, a variable known to play an important role in the complexation of metal ions by polymersupported reagents [35], VBC was polymerized with acrylamide to give a polymer with chlorine and nitrogen elemental analyses of 2.32 and 3.82 mmol/g, respectively. The polymer-supported crown ether (3), formed after reaction with Me14C4-OH/NaH, complexed 40% of the Li C from a 10 K4 N solution, pointing to the importance of resin polarity to ionic accessibility.…”

Recent Advances in the Chemistry and Applications of the Diphonix Resins

“…Hereinafter this resin will be referred to as Regular Diphonix resin. The preparation and properties of Regular Diphonix resin have been described in a series of publications (1)(2)(3)(4)(5)(6)(7)(8)(9). Regular Diphonix resin is now available commercially from Eichrom Industries, Darien, E.…”

A study on the sorption of NO3− and F− on the carboxymethylated starch‐based hydrogels loaded with Fe2+ ions

“…[1][2][3][4][5] Complexation behavior of these resins is influenced by their characteristic features. [6][7][8][9] Polymeric supports possessing amide, carboxylic, or ammonium groups have been widely used in this area.…”