Physico-chemical and Thermodynamic Studies of La(III), Ce(III), Pr(lll), Nd(III), Sm(lll), Gd(III), Tb(lll), Dy(III), Ho(lll), and Yb(II)D-chelates of N-salicylidenevaline

Department of Chemistry, University of Jodhpur, Jodhpur

Manuscript received 16 July 1977, revised 10 April 1978, accepted 11 August 1979

The stability constants and other thermodynamic parameters of the rare-earth chelates of N-salicylidenevaline have been determined using Calvin-Bjerrum \(p\)H-titration technique as used by Irving and Rossotti in aqueous media (µ=0.1, 0.05 and 0.01M NaClO₄) at 25^°, 30° and 35° and the order of stability constants is found to be La(III)< Ce(III)<Pr(III) <Nd (III) < Sm(III) <GD(III) <Tb(III)<Dy(III) <Ho(III) <Yb(III) which is in agreement with the lanthanide contraction. Magnetic conductance and Y.R. studies of the solid chelates have also been carried out.