Mm. Shoukry et al., BINARY AND TERNARY COMPLEXES OF CD(II) INVOLVING TRIETHYLENETETRAMINEAND SELECTED AMINO-ACIDS AND DNA UNITS, Mikrochimica acta, 129(1-2), 1998, pp. 107-113
The formation equilibria of the binary complex of cadmium(II) with tri
ethylenetetramine (Trien) and of ternary complexes Cd(Trien)L, where L
refers to amino acids, DNA constituents and related compounds have be
en investigated. Cd(II) was found to form a highly stable complex with
Trien. The acid-base equilibria of Cd(Trien)(2+) were characterized.
Ternary complexes of amino acids and DNA constituents are formed throu
gh stepwise mechanism, whereby Trien binds to Cd(II), followed by inte
raction with ligand (L), whereas thiol-containing ligands form ternary
complexes through a simultaneous mechanism. The formation constants o
f the complexes were determined at 25 degrees C and mu = 0.1M NaNO3. T
he participation of different ligand functional groups in the complex-
formation was examined.