Reactions of Zinc Salts with bis(Benzimidazolyl) Derivatives

Synthesis and spectral studies on Co (II), Ni(II) and Cu(II) complexes with 1,2- bis(N-methylbenzimidazolyl)benzene

“…The complex [Co(OClO 3 ) 2 (L) 1 13 The spectral features are characteristic of coordination of one of the perchlorate groups to Cu(II), the other being outside the coordination sphere. 5 The far-IR spectra of the chloro complexes displayed peaks due to terminal  M-Cl and  M-N (M = Co, Ni or Cu) around 315 and 278 cm -1 respectively. 14 The room temperature magnetic moments of the complexes indicate the paramagnetic nature of the metal ions except for [Ni(L) 2 ](ClO 4 ) 2 .H 2 O which behaved as diamagnetic.…”

“…8 The complexes of nickel decompose in dmf as evidenced by the colour change in solution and also the conductivity data. 5 Physical properties and analytical data of the complexes are listed in Table 1.…”

“…4 Nickel(II) complexes containing chelating benzimidazolyl ligands are also of importance as they display interesting spectral and magnetic behaviours. 5 The reactivity of several multidentate N-heterocycles with nickel(II) and the spectral and magnetic properties of the resultant complexes are studied earlier. 6,7 Copper is a biologically important element.…”

“…The imidazole groups are also ligated to copper in several blue copper proteins, such as plastocyanin, stellamycin, and azurin. 8 The metalloenzyme superoxide dismutase contains copper and zinc. Benzimidazole derivatives and their metal complexes exhibit biological and catalytic activities.…”

Synthesis and Characterization of Palladium(II) Complexes with 2-(2'-hydroxylphenyl)benzoxazole, 2-(2'-hydroxyl phenyl)benzothiazole or the Mixed Ligands

“…The biological activity of these ligands increase on complex formation with metal ions 18,19 . It is believed that they react selectively toward certain biological system 20 .…”