Abstract
Adduct formation constants have been determined by spectrophotometric study of a few typical bases with nickel(II) chelate of 4‐methyl‐8‐quinolinol in chloroform. Bathochromic and hypsochromic shifts were observed in the visible range due to the adduct formation. Monobasic bases like pyridine, methyl substituted anilines and such other bases exhibit 1: 2 stoichiometry giving hexa – coordinated adductds . The dibasic bases such as 1,10‐phenanthroline and 2,9‐ neocuproine exhibit 1 : 1 stoichiometry giving hexacoordinated adducts . The experimental results are discussed in terms of the basicity and steric effects of the various bases.
Highlights
Nickel(II) chelates of several ligands like diphenylcarbazone, diphenylthiocarbazone, 8-quinolinol and its substituted analogues produce intense absorption in the optical spectra, in the visible range, which is characteristic of the ligand itself
Structural changes occurred in the nickel(II) chelates on addition of nitrogen bases forms adduct which gives rise to profound spectral changes. Such bathochromic and hypsochromic shifts observed in the visible region of the spectra of nickel(II) chelates of dithizone[1], dipheylcarbazone2, 8-quinolinol[3], methylsubstituted 8-quinolinols[3], substituted diphenylcarbazones and dithizones4-11on addition of nitrogen bases
These were employed for the determination of adduct formation constants
Summary
Nickel(II) chelates of several ligands like diphenylcarbazone, diphenylthiocarbazone, 8-quinolinol and its substituted analogues produce intense absorption in the optical spectra, in the visible range, which is characteristic of the ligand itself. Structural changes occurred in the nickel(II) chelates on addition of nitrogen bases forms adduct which gives rise to profound spectral changes. Such bathochromic and hypsochromic shifts observed in the visible region of the spectra of nickel(II) chelates of dithizone[1], dipheylcarbazone2, 8-quinolinol[3], methylsubstituted 8-quinolinols[3], substituted diphenylcarbazones and dithizones4-11on addition of nitrogen bases.
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