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Inorganic Chemistry Laboratory, University College of Science, Calcutta-700009. Manuscript received 22 August 1975 ; accepted 22 October 1975. The synthesis of 2-2' (benzenesulphonamido)-ethylene dibenzimidazole (RbeβbH) has been reported and the uv and ir spectral data are recorded. Preparation of 2-2' (\(\alpha\)-benzenesulphonamido)- trimethylene dibenzimidazole (Rb\(p\gamma\)bH) has also been described. The stepwise acid dissociation constants of the ions Rb\(p\gamma\)bH32+ anddoi:10.5281/zenodo.6385863 fatcat:ywdnment6ffv7lkgcgippbwfky