Structural characterization of immobilized-polysiloxane iminobis (N-diethylenediamineacetamide) ligand system

Abstract

Insoluble porous solid polysiloxane immobilized ligand system bearing chelating ligand group of the general formula P(CH2)3N[CH2CONH(CH2)2NH(CH2)2NH2]2 (where P represents [SiO]n polysiloxane network) has been prepared by the reaction between the polysiloxane immobilized diethyliminodiacetate ligand system, P(CH2)3N(CH2CO2Et)2 and diethylenetriamine in toluene. The XPS and FTIR results showed that all ethylacetate groups (COOEt) are converted into the amide groups (NCO). The new functionalized ligand system exhibits high capacity for the uptake of the metal ions (Mn2+, Fe3+, Co2+, Ni2+, Cu2+ and Zn2+). Complexation of the prepared ligand system for these metal ions at the optimum conditions was found in the order: Cu2+>Ni2+>Fe3+>Co2+>Mn2+>Zn2+. This ligand system shows higher capacity toward the metal ions than its iminiodiactate precursor which we have been …