The determination of formation constant of Binary Complexes(ML) , where M = La(III), Pr(III), Sm (III), Gd (III) And Dy (III) and L = Vitamin-U have been carried out using Irving- Rossotti titration technique in aqueous media at 25 ± 0.1ºC temperature . The ionic strength μ = 0.2M was held constant using sodium per chlorate as an electrolyte. The stability constant s of trivalent lanthanide vitamin-U complexes were calculated and explained. The mechanism, through which Protonation and complex formation takes place, has been suggested.
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