✦ LIBER ✦
Potentiometric Studies of Binary and Ternary Complexes Involving Cadmium(II) and Nitrilo-Tris(Methyl Phosphonic Acid) with Amino Acids, peptides and DNA Constituents
✍ Scribed by Azza A. Shoukry; Mohamed M. Shoukry
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 221 KB
- Volume
- 97
- Category
- Article
- ISSN
- 0003-4592
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✦ Synopsis
Abstract
The complexing properties of nitrilo‐tris(methylphosphonic acid) (NTP) with cadmium(II) were investigated pH‐metrically at 25 °C and at ionic strength of 0.1 mol dm^‐3^ (NaNO~3~). Stoichiometry and stability constants for the complexes formed are reported. Cadmium (II) forms Cd(NTP)^4‐^ and the corresponding hydroxy complexes. The ternary complexes are formed in a stepwise mechanism whereby NTP binds to cadmium(II), followed by coordination of amino acids, peptides or DNA. The concentration distribution of the various complex species has been evaluated.