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- W2027897218 abstract "The stability constants of the 1:1 complexes formed between Mg2+, Mn2+, Co2+, Ni2+ or Cd2+ (= M2+) and the anionic 5(6)-nitrobenzimidazolate [= (NBI–H)−] or 5,6-dinitrobenzimidazolate [= (DNBI–H)−] were determined by potentiometric pH titrations in aqueous solution (25 °C; I = 0.5 M, NaNO3). The acidity constants for the deprotonation of the (N1)H sites in neutral NBI and DNBI (= L) were measured by the same method. The comparison of the stability constants determined for the M(L–H)+ complexes with those calculated from log KMLM versus pKHLHstraight-line plots, which were established recently for neutral benzimidazole-type ligands, reveals that the stabilities of the M(L–H)+ complexes are significantly enhanced, as one might have expected due to the negative charge present on the ligands. Of course, the electron-withdrawing properties of (N3)-bound metal ions facilitate the release of the proton from the (N1)H site in the M(NBI)2+ and M(DNBI)2+ complexes, if compared to the situation in the free ligands. The effect of a metal ion bound to a benzimidazolate or imidazolate residue on the coordination tendency toward a further metal ion (giving rise to an imidazolate bridge) was estimated." @default.
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- W2027897218 date "1999-10-01" @default.
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- W2027897218 title "On the Metal-Ion-Coordinating Properties of the Benzimidazolate Residue in Aqueous Solution – Extent of Acidification of Benzimidazole-(N3)H Sites by (N1)-Coordinated Divalent Metal Ions" @default.
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- W2027897218 doi "https://doi.org/10.1002/(sici)1099-0682(199910)1999:10<1781::aid-ejic1781>3.0.co;2-h" @default.
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