Metal ion complexing properies [i.e. properties] of amide donating ligands

UNCW Author/Contributor (non-UNCW co-authors, if there are any, appear on document)
Chynthia Janette Siddons (Creator)
The University of North Carolina Wilmington (UNCW )
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Robert Hancock

Abstract: The present state of knowledge of the coordinating properties of polyamine ligands with pendant amide groups is reviewed. The coordinating properties of ligands of this type are largely unknown at the present time. The high basicity of amide oxygen donors relative to other neutral oxygen donors such as ethers is discussed. This high basicity should make these ligands much more strongly complexing than analogs with ethereal type donor atoms such as crown ethers. The ligands EDTAM (ethylenediamine- N, N, N’, N’-tetraacetamide), and NTAM (nitrilotriacetotriamide) contain neutral acetamide oxygen donors. These ligands have been synthesized by improved methods. The protonation constant for the ligand EDTAM was determined to be 4.37 in 0.1M NaNO3 at 25° C. Log K values were determined with a variety of metal ions: Ca2+, 3.29; Sr2+, 2.30; Ba2+, 2.27; La3+, 5.16; Co2+, 5.94; Pb2+, 6.16; Cd2+, 7.40; using potentiometric and polarographic methods. The protonation constant for NTAM has been determined to be 2.60 in 0.1M NaNO3 at 25 ºC. Crystals were grown of the metal ion complex [Cd(EDTAM)](NO3)2. This was done to determine the mode of coordination of the amides and the number of amides coordinated to the metal ion.

Additional Information

A Thesis Submitted to the University of North Carolina at Wilmington in Partial Fulfillment Of the Requirements for the Degree of Master of Science
Language: English
Date: 2009
Ligands (Biochemistry), Metal ions--Analysis, Polyamines--Synthesis
Metal ions -- Analysis
Ligands (Biochemistry)
Polyamines -- Synthesis

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