Metal Complexes of 2,4 (or 7)-Dimethyl Benzimidazole with Different Metal Ions Like Co(II), Ni(II), Cu(II) and Zn(II)
| Main Authors: | A. KRISHNA MURTHY, P. LlNGAlAH |
|---|---|
| Format: | Article Journal |
| Bahasa: | eng |
| Terbitan: |
, 1983
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/6342600 |
Daftar Isi:
- Department of Chemistry, University College, Kakatiya University, Warangal-506 009 Manuscript received 30 November 1981, revised 28 July 1982, accepted 28 January 1983 The interaction between 2,4(or 7)-dimethyl benzimidazole with protons and different bivalent metal ions like Co(II), Ni(II), Cu(II) and Zn(II) was studied potentiometrically at different temperatures, ionic strengths and in solutions of varying dielectric constant. The ionization constant of protonated species of 2,4(or 7)-dimethyl benzimidazole and the formation constants of complexes were computed by Bjerrum's method as adapted by Irving and Rossotti and compared with those of imidazole and other benzimidazoles. The validity of Amis equation was verified by plotting pKa and log K of Cu(II) complex vs 1/D, from which the distance of closest approach was calculated as 1.7 and 2.8 Å. The lower stability of DMBIm complexes, compared to imidazole, is attributed to the steric hindrance offered by the benzene ring of the benzimidazole.