Abstract
The chelation behaviour of some trivalent lanthanide and yttrium metal ion with biologically active 2-hydroxy-1-naphthaldehyde thiosemicarbazone (HNATS) has been investigated by potentiomotric measurements at 20±0.5°C in 75% (v/v) dioxane-water medium at various ionic strengths of sodium perchlorate. The method of Bjerrum and Calvin, as modified by Irving and Rossotti has been used to find out the values of\(\bar n\) (average number of ligand bound per metal ion) andpL (free ligand exponent). The formation constants of metal chelates have been computed on a PC-XT computer, using a program patterned after that of Sullivan et al. to give βn values using weighted least squares method. TheSminvalues (Smin=χ2) have been calculated. The order of formation constants of chelates was found to be: La3+<Ce3+<Pr3+<Nd3+<Sm3+<Eu3+<Gd3+<Y3+<Tb3+<Dy3+. The formation constants of the chelates formed have been correlated to size and ionization potentials of the metal ions.
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