Sulfonyl Hydrazone Cholesterol Conjugate: Gelation, Anion Interaction with Application in Dye Adsorption
Cholesterol appended sulfonyl hydrazone derivative 1 has been designed and synthesized as supramolecular gelator for anionic sensing and dye adsorption. Gelator 1 forms a stable gel from DMSO-H2O. Intermolecular H-bonding involving the sulfonamide moieties and hydrophobic interaction between the cholesterol units encourage gelation. SEM images of the xerogels show tiny rod-like fibrous structures. Rheological studies of the gel reveal the viscoelastic nature of the material . The gels of 1 exhibit a sharp and selective response toward CN- and F- ions causing gel-to-sol transformation. The gels of 1 are also potent in adsorption and removal of anionic dyes, such as erythrosine B and uranine, from water. Preparation of a gel column with the gel of 1 shows reasonably high one time erythrosine B removal efficiency and establishes its potential and promising real-life applicability in water purification.