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)
- Institution
- The University of North Carolina Wilmington (UNCW )
- Web Site: http://library.uncw.edu/
- Advisor
- 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.
Metal ion complexing properies [i.e. properties] of amide donating ligands
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Created on 1/1/2009
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Additional Information
- Publication
- Thesis
- 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
- Keywords
- Ligands (Biochemistry), Metal ions--Analysis, Polyamines--Synthesis
- Subjects
- Metal ions -- Analysis
- Ligands (Biochemistry)
- Polyamines -- Synthesis