Ligand-exchange reaction between tris(1,10-phenanthroline)metal(II) and tris(4,7-diphenyl-1,10 phenanthroline)metal(II) ions

Mudasir, N. Yoshioka, H. Inoue

Research output: Contribution to journalArticle


The ligand exchange reaction between [M(phen)3]2+ and [M(DIP)3]2+ (where M is the same and M = FeII or NiII, phen = 1,10-phenanthroline, DIP = 4,7-diphenyl-1,10-phenanthroline) has been investigated by reversed phase ion-paired chromatography (RP-IPC). The effect of pH and solvent on the ligand-exchange reaction is studied by monitoring the variation in chromatograms with time after mixing. The results have shown that the ligand exchange reaction between [M(phen)3]2+ and [M(DIP)3]2+ takes place in the pH range of 3 - 8 and the rate of reaction for nickel(II) complexes is about two times slower than, that for iron(II) complexes. Experiments on the effect of various solvents on the ligand-exchange reaction have revealed that the rate of reaction is enhanced by the solvent in the following order: (CH3)2CO > CHCl3 ≥ CH2Cl2 > CH3CN > CH3OH. Elemental analysis and UV-visible spectroscopy confirmed that the products obtained from the ligand-exchange reaction are mixed-ligand complexes containing phen and DIP ligands, i.e., [M(phen)2(DIP)]2+ and [M(phen)(DIP)2]2+.

Original languageEnglish
Pages (from-to)333-344
Number of pages12
JournalJournal of Coordination Chemistry
Issue number4
Publication statusPublished - 2001 Jan 1



  • 1,10-phenanthroline
  • HPLC
  • Iron(II) and nickel(II)
  • Ligand-exchange reaction
  • Mixed-ligand complexes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry

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