Metal Chloride Complexes with Vinyl Derivatives of 2-Aminobenzimidazole in the Reaction with Hydrogen Chloride

The IR, UV, and (1)H NMR spectroscopic and potentiometric titration methods are used to establish that hydrogen chloride reacts with the metal coordination compounds based on 1-vinyl-2-aminobenzimidazole (L(1)), 1,3-divinyl-2-iminobenzimidazole (L(2)), and 1-methyl-3-vinyl-2-iminobenzimidazole (L(3)) to give the ionic-type products [LH](n)(+)[MCl(m+n)](n-) (M = Zn(2+), Cd(2+), Cu(2+), Ni(2+), Co(2+), or Sn(4+); m = 2 or 4; and n = 1 or 2), in which the vinyl group is not involved in the coordination, while the ligands in the complexes with L(1) are in the imino form. The coordination bond in the ionic complexes with L(2) and L(3) is found to be weakly polarized.