Polysiloxane-immobilized triamine ligand system, synthesis and applications

The polysiloxane-immobilized triamine ligand system of the formula P-(CH 2 ) 3 NH(CH 2 ) 2 NH(CH 2 ) 2 NH 2 (where P represents the siloxane network) has been prepared via the sol-gel process by hydrolytic polycondensation of (EtO) 4 Si and (MeO) 3 Si(CH 2 ) 3 NH(CH 2 ) 2 NH(CH 2 ) 2 NH 2 . An alternative method was used by the reaction of the iodopolysiloxane P-(CH 2 ) 3 -I and diethylenetriamine in the presence of triethylamine. The immobilized triamine ligand forms metal chelate complexes when treated with aqueous metal(II) ion solutions (Co 2+ , Ni 2+ , and Cu 2+ ). The elemental analysis and FTIR results suggest that this ligand system undergoes a substantial leaching of diethylenetriamine ligand moieties from the siloxane framework

Uptake of divalent metal ions (Cu2+, Ni2+, and Co2+) by polysiloxane immobilized triamine-thiol and thiol-acetate ligand system

Insoluble porous solid polysiloxanes-immobilized ligand systems bearing hybrid mixture of triamine-thiol ligand and thiol-acetate ligand as chelating functional groups of the general formula P-(CH2)3-X(Y) (Where P represents a silica like siloxane framework and X represents a mixture of triamine and thiol, -NHCH2)2NH-(CH2)2-NH2 and –SH, and Y represents a thiol-acetate -SCH2COOH functional groups) has been prepared. The immobilized triamine-thiol ligand system was prepared through the sol-gel process by hydrolytic polycondensation of Si(OEt)4 and a mixture of 3-mercaptopropyltrimethoxysilane and 3-diethylenetriaminepropyltrimethoxysilane coupling agents. The immobilized thiol-acetate ligand system was prepared by the reaction of polysiloxane immobilized thiol ligand with ethylchloroacetate. These ligand systems exhibit high potential for extraction and preconcentration of divalent metal ions (Co

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

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 [SiO]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 (NCO). 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