Interaction of N-[Tris(hydroxymethyl)methyl]glycine with some Transition Metal Complexes in Aqueous Solution

Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi-221 005

Manuscript received 19 September 1986, revised 17 July 1987, accepted 17 August 1987

Equilibrium study of the reaction between Cu^II, Ni^II, Co^II, Zn^II, Cd^II or Pb^II with 1,10-phenanthroline (phen) and N-[tris(hydroxymethl)glycine (H₃L) by potentiometric titration technique in aqueous solution at 30° and at an ionic strength 0.01 M (KNO₃) provided evidence of formation of ternary (1 : 1 : 1) complexes M(Phen)(H₂L)⁺. Cu^II formed two different species Cu(phen)(H₂L)+ and Cu(Phen)(HL). Trends of ∆ log K values and the tentative structures of the different species have been discussed.