title: Spectrophotometric study of fluorescence sensing and selective binding of biochemical substrates by 2,2'-bridged bis(beta-cyclodextrin) and its water-soluble fullerene conjugate.
abstract: A bis(beta-cyclodextrin)-fullerene conjugate (3) linked at the secondary hydroxyl side was prepared in a good yield from its precursor N,N'-bis(2-(2-aminoethylamino)ethyl)malonamide-bridged bis(beta-cyclodextrin) (2). Spectrophotomeric studies on the conformation and the inclusion complexation behavior of 3 with a variety of organic and biochemical substrates by means of UV-vis, FT-IR, NMR, fluorescence, and circular dichroism spectroscopy showed that the bis(beta-cyclodextrin)-fullerene conjugate displayed an intramolecular capsule-type conformation in aqueous solution. Because of the multiple binding of bis(beta-cyclodextrin) with substrates, 2 can act as an efficient fluorescence sensor for biochemical substrates, while its fullerene conjugate 3 displays a capability of cleaving DNA under visible-light irradiation.
authors.affiliation: Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China. yuliu@public.tpt.tj.cn
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Peng
authors.initials: P
authors.lastname: Liang
authors.forename: Yong
authors.initials: Y
authors.lastname: Chen
authors.forename: Yan-Li
authors.initials: YL
authors.lastname: Zhao
authors.forename: Fei
authors.initials: F
authors.lastname: Ding
authors.forename: Ao
authors.initials: A
authors.lastname: Yu
mesh_terms: D001593:Benzyl Compounds / Q000737:chemistry*; D037741:Fullerenes / Q000737:chemistry*; D008314:Malonates / Q000737:chemistry*; D008956:Models, Chemical; D015394:Molecular Structure; D012995:Solubility; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry*; D047392:beta-Cyclodextrins / Q000737:chemistry*
chemical_list: D001593:Benzyl Compounds; D037741:Fullerenes; D008314:Malonates; C511016:N,N'-bis(2-((2-hydroxybenzylidine)amino)ethyl)malonamide; D047392:beta-Cyclodextrins; D014867:Water