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Metal ion complexing properties of the two-dimensional, highly preorganized ligand 1, 10-Phenanthroline-2, 9-Dicarboxylic acid

UNCW Author/Contributor (non-UNCW co-authors, if there are any, appear on document)
Darren Landon Melton (Creator)
The University of North Carolina Wilmington (UNCW )
Web Site:
Robert Hancock

Abstract: Preorganized ligands have proven to be important to inorganic chemistry, yielding higher stability constants and sharper metal ion selectivity than their more flexible analogs. These ligands may have important applications in the biomedical, environmental, and industrial fields, to name a few. The ligand, 1,10-phenanthroline-2,9-dicarboxylate (PDA), was chosen for research and crystals of 1,10-phenanthroline-2,9-dicarboxylic acid were synthesized and then characterized by NMR and IR to determine their purity. Titration experiments were performed on aqueous solutions of the metal and PDA. A competing ligand, EDTA, was also introduced to the titration experiments and aided in the determination of formation constants, log K1, for metal ions with PDA. UV/Vis spectrophotometry was used as a detection method for the formation of metal-PDA complexes. The log K1 values for metal-PDA complexes were determined from UV absorbance data as a function of pH. Formation constants for metal ions such as Ca(II), Cd(II), Zn(II), Gd(III), and Pb(II) are reported, as well as the crystal structure of [Ca(PDA)(H2O)2]. 153Gd(III)-radiolabeling experiments were also performed to indicate the stability of the Gd(III)- PDA complex. Overall, these experiments were used to obtain an understanding of the metal ion complexes of PDA.

Additional Information

A Thesis Submitted to the University of North Carolina Wilmington in Partial Fulfillment Of the Requirements for the Degree of Master of Science
Language: English
Date: 2009
Ligands--Synthesis, Metal complexes
Ligands -- Synthesis
Metal complexes