Studies on coordination environment of transition metal chloride anionic speciation of N, N-disulfodiisopropylammonium ionic salts and assessment of their Brönsted-Lewis acidic properties

Abstract

Four ionic salts of N, N-disulfodiisopropylammonium cation with complex anionic speciation of metal chlorides such as [FeCl₄]^-, [NiCl₄]^2-, [Zn₂Cl₆]^2-/[Zn₄Cl₁₀]^2-, [CoCl₄]^2-/[CoCl₃]^- were synthesized and characterized with FT-IR, NMR, TGA, Raman and electronic spectra. Comparative Brönsted acidic and Lewis acidic strength of the salts were assessed for catalytic uses in organic reactions via UV-Vis Hammett plot and FT-IR spectra using pyridine as probe molecule respectively. Band gap values obtained from Tauc plot present their semiconductor behavior to design ionic liquid based photo catalysts in future.