Binding Modes of a Phenylpyridinium Styryl Fluorescent Dye with Cucurbiturils.

ABSTRACT: In order to explore how cucurbituril hosts accommodate an N-phenyl-pyridinium derivative guest, the complexation of the solvatochromic dye, 4-(4-(dimethylamino)styryl)-1-phenylpyridinium iodide (PhSt) with ,',δ,δ'-tetramethyl-cucurbit[6]uril (Me₄CB6) and cucurbit[7]uril (CB7) was investigated by absorption spectroscopic, fluorescence and NMR experiments. In aqueous solutions, PhSt forms 1:1 complexes with both cucurbiturils, the complex with CB7 has a higher stability constant (K_a = 6.0 × 10⁶ M^-1) than the complex with Me₄CB6 (K_a = 1.1 × 10⁶ M^-1). As revealed by NMR experiments and confirmed by theoretical calcul

SUBMITTER: Paudics A 

PROVIDER: S-EPMC7663148 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature