Monatshefte fur Chemie p. 883 - 890 (1992)
Update date:2022-08-10
Topics:
Sharma, Sahadev R. K.
Sindhwani, S. K.
The chelation behaviour of some trivalent lanthanide and yttrium metal ion with biologically active 2-hydroxy-1-naphthaldehyde thiosemicarbazone (HNATS) has been investigated by potentiometric measurements at 20+/-0.5 deg C in 75percent (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 n* (average number of ligand bound per metal ion) and pL (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.The Smin values (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. Keywords.Lanthanide metal ion; 2-Hydroxy-1-naphthaldehyde thiosemicarbazone (HNATS); Formation constant; Potentiometry.
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