Polymer complexes XXXIV. Potentiometric and thermodynamic studies of monomeric and polymeric complexes containing 2-acrylamidosulphadiazine
Introduction
Recently, an important new focus for environmental inorganic chemistry is the selective removal and recovery of metal ions from aqueous solution with organic ligands anchored to modified polymer backbones [1], [2], [3]. Several significant criteria for facile metal ion removal from aqueous solution includes the hydrophilicity of the pendant organic ligand when it is anchored to a hydrophobic, pH stable polymer backbone such as modified, kinetics and thermodynamics of the pendant ligand reaction with the selected metal ion [4], [5].
In this paper we extend our preliminary studies [6] and focus attention on the preparation of polymers as polydentate ligands. Here we describe the synthesis and characterization of 2-acrylamidosulphadiazine (ASD) which possesses one polymerizable vinyl group. Our approach is to study the dissociation of ASD and determine the stability constants of its metal complexes with Mn2+, Co2+, Ni2+, Cu2+, Zn2+, La3+, UO22+ and Th4+ in monomeric and polymeric forms, using potentiometric measurements and thermodynamic calculations.
Section snippets
Preparation of the monomer
ASD was prepared [6] by the equimolar amounts of acryloyl chloride (Aldrich) and sulphadiazine (Aldrich) in dry benzene using hydroquinone as inhibitor. The crude material was recrystallized from ethyl alcohol and then dried in a vacuum desiccator over anhydrous calcium chloride. The purity was checked by elemental analysis, IR and H NMR spectra.
Acid dissociation constants
The average acid dissociation constant of the ligand in monomeric (ASD) and in polymeric (PASD) form at different pH values, , were calculated from the titration curves of acid in the absence and presence of ligand. Thus, the formation curves ( vs. pH) for the acid systems were constructed and found to extend between (0 and 2) in the scale for ASD and PASD. This means that, each of ASD and PASD has two dissociable protons (the enolized hydrogen ions of the amidic proton, CONH and
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