COLL 330 |
| Jun Yang, Hengli Ma, and Subra Muralidharan. Department of Chemistry, Western Michigan University, 3120 Wood Hall, Kalamazoo, MI 49008 |
| High selectivities in the recognition of closely related metal ions is important for their detection in complex matrices which is important for environmental remediation and homeland security applications. We have designed and synthesized novel metal ion chelating self-assembling ligands based on the pyrazolone and isoxazolone heterocyclic rings. These rings can be condensed in the 4 position with alkyl and alkenyl acid chlorides to obtain acylpyrazolones and acylisoxazolones. Hydrophobic and amphiphilic substituents in the 1,3, and 4 positions in acylpyrazolone and 3 and 4 position in the acylisoxazolone have been systematically varied to obtain a family of acylpyrazolone and acylisoxazolone ligands that self-assemble in the aqueous phase and on solid surfaces to form nanomolecular assemblies. The recognition of metal ions nanomolecular assemblies in solution and on solid surfaces such as reverse phase silica has been investigated by HPLC. This recognition is dependent on the substituents in the 1,3, and 4 positions and the nature of the amphiphilic group. These ligands also form nanomolecular assemblies on nanoparticles such as SiO2 and TiO2 which also display interesting metal ion recognition capabilities. These nanoself-assemblies have been characterized by spectroscopic and imaging techniques and mechanisms for their metal ion recognition have been deduced. The results of these studies will be presented. |
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Nanoscience and Nanotechnology
8:30 AM-11:45 AM, Tuesday, March 30, 2004 Marriott -- Grand Ballroom J, Oral
Division of Colloid and Surface Chemistry |