Vasu, Anuji K.Anuji K.VasuKhurana, RamanRamanKhuranaMohanty, JyotirmayeeJyotirmayeeMohantyKanvah, SriramSriramKanvah2025-08-302025-08-302018-01-0110.1039/c8ra03355b2-s2.0-85046901841https://d8.irins.org/handle/IITG2025/22976The interaction between red-emitting pyridinium derivative [4-((1E,3E)-4-(4-(dimethylamino)phenyl)buta-1,3-dien-1-yl)-1-methylpyridin-1-ium] (DABP) and cucurbit[7]uril was investigated using optical absorption, steady-state and time-resolved fluorescence and anisotropy measurements. The changes in the UV/Vis absorption, fluorescence spectral characteristics and lifetime, with a change in pH, reveal efficient binding of CB7 to the dye molecule. The cucurbit[7]uril encapsulated DABP brings ∼1.5 units upward pK<inf>a</inf> shift. The formation of supramolecular assemblies with 1:1 and 2:1 host-guest stoichiometries with CB7 at different pH conditions have been verified from ¹H NMR, isothermal titration calorimetric studies and geometry optimization calculations. CB7-dye complexation and the ensuing morphological changes were revealed by SEM, AFM and optical microscopy images. This pH-responsive supramolecular assemblies of red-emitting DABP dye can find potential applications in biological imaging, optical pH-sensor and the construction of building blocks for the supramolecular architectures.trueArticlehttps://pubs.rsc.org/en/content/articlepdf/2018/ra/c8ra03355b2046206916738-16745201810arJournal11WOS:000431814500036