ANYL 49 |
| We have designed and synthesized a new and novel family of amphiphilic acylpyrazolones with various substituents in the 1,3, and 4 positions for the efficient separation of metal ions especially the trivalent lanthanide metal ions. These acylpyrazolones form nanoscale self-assemblies in the aqueous phase and on reverse phase silica chromatography support as inferred by transmission electron microscopy (TEM) and HPLC studies. Many of these amphiphilic ligands are capable of separating a mixture of light and heavy lanthanide ions in the pH range 2 – 3. This separation is highly dependent on the self-assembling characteristics of these ligands. The variation of substituents in the 1,3, and 4 positions have a significant influence on the self-assembling properties and metal ion selectivities. Monodisperese SiO2 nanoparticles in the size range of 40 – 70 nm have been tethered with monolayers of acylpyrazolones and acylisoxazolones with various substituents in the 1,3, and 4 positions. These ligand-tethered nanoparticles exhibit interesting and unique self-assembling characteristics as indicated by transmission electron microscopy (TEM) images and light scattering studies. Definite patterns in their self-assemblies could be discerned from these studies.. The efficacies of these nanoparticle self-assemblies for the recognition of trivalent lanthanide ions have been examined and compared with the efficacies of amphiphilic acylpyrazolone nanoscale self-assemblies on a reverse phase silica support. These results will be presented. |
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Analytical Approaches
1:30 PM-5:00 PM, Sunday, 26 March 2006 Georgia World Congress Center -- B215, Oral
Division of Analytical Chemistry |