PH-responsive molecular assemblies of pyridylbutadiene derivative with cucurbit[7]uril.

ABSTRACT: The 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 _a 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 calcula

SUBMITTER: Vasu AK 

PROVIDER: S-EPMC9080325 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature