Two distinct typed of host polymers, [EDTA]3[PEG400]7and [EDTA][PEG400]2, consisting of polyether chains linked together by ethylenediaminetetraacetic acid (EDTA) chelating units, were synthesized from EDTA acetate esters and poly(ethyleneglycol) 400 (PEG). Their structures were revealed by analytical analyses, viscosimetric measurements, NMR and FT-IR studies. Direct dissolution of delta-LiCl and delta-MgCl2 in in these prepared host polymers resulted in the following complexes [EDTA]3[PEG400]7/(LiCl)6.39, [EDTA]3[PEG400]7/(MgCl2)8.23, [EDTA]3[PEG400]7/(LiCl)6.39(MgCl2)1.98 and [EDTA]-[PEG400](2)/LiCl)2.26(MgCl2)1.98. Mid- and far-FT-IR spectroscopic studies revealed the following properties for all six complexes: a) the polyether chains are in the trans-gauche-trans conformation; b) the Mg2+ ion could be hexa- or heptacoordinated to the chelating sites of EDTA; c) the Li+ ion is preferentially coordinated by the oxygen atoms of teh residual acetate groups and polyether moieties. Results of conductivity measurements at room temperature indicated that the proposed Mg products might be very useful for the development of electrochemical transducers for measureing water hardness.
Synthesis and characterization of lithium and magnesium complexes based on [EDTA][PEG400]2 and [EDTA]3[PEG400]7
DI NOTO, VITO;LAVINA, SANDRA
2002
Abstract
Two distinct typed of host polymers, [EDTA]3[PEG400]7and [EDTA][PEG400]2, consisting of polyether chains linked together by ethylenediaminetetraacetic acid (EDTA) chelating units, were synthesized from EDTA acetate esters and poly(ethyleneglycol) 400 (PEG). Their structures were revealed by analytical analyses, viscosimetric measurements, NMR and FT-IR studies. Direct dissolution of delta-LiCl and delta-MgCl2 in in these prepared host polymers resulted in the following complexes [EDTA]3[PEG400]7/(LiCl)6.39, [EDTA]3[PEG400]7/(MgCl2)8.23, [EDTA]3[PEG400]7/(LiCl)6.39(MgCl2)1.98 and [EDTA]-[PEG400](2)/LiCl)2.26(MgCl2)1.98. Mid- and far-FT-IR spectroscopic studies revealed the following properties for all six complexes: a) the polyether chains are in the trans-gauche-trans conformation; b) the Mg2+ ion could be hexa- or heptacoordinated to the chelating sites of EDTA; c) the Li+ ion is preferentially coordinated by the oxygen atoms of teh residual acetate groups and polyether moieties. Results of conductivity measurements at room temperature indicated that the proposed Mg products might be very useful for the development of electrochemical transducers for measureing water hardness.
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