Daftar Isi: Equilibrium and Formation Constants of Co(Il), Ni(lll) and Zn(ll) Complexes of N-Benzoyl Phenyl Hydroxy Amine in Various Mixed Aqueous Solvents

Daftar Isi:

Chemistry Department, University of Bnrdwan, Burewan-718 104, West Bengal Manuscript received 5 June 1981, accepted 23 May 1982 The equilibrium constants β=[ML][H]/[M][HL], where M=Co(II), Ni(II) or Zn(II) ; HL= N-benzoyl phenyl hydroxyl amine (NBPHA) and formation constant β=[ML]/[M][L] have been determined in five different mixed aqueous solvents namely, dioxane-water, isopropano-water, acetone-water, ethanol-water and methanol-water in 75% v/v compositions. The order of equilibrium constants (log βn) are found to have no relation with 1/e sequence of the media, but is almost the same for different metal ions. The formation constants (log βn), however, are in a sequence similar to 1/e sequence, with a few exceptions. In all the solvents the order of stability is Co(II) > Ni(II) < Co(Il) > Zn(II). The anomalous position of Co(II) is attributed to Jahn Teller type of distortion.