Fluoride-induced intermolecular excimer formation of bispyrenyl thioureas linked by polyethylene glycol chains
作者:Duangrat Thongkum、Thawatchai Tuntulani
DOI:10.1016/j.tet.2011.08.060
日期:2011.10
induced the pyrene excimer formation. Job’s plots showed 1/1 or 2/2 complexation of L1 with F−. Ratios of IE/IM of L1·F− complex were dependent on the concentration of L1, implying that the dimerization of L1 proceeded via the intermolecular excimer formation. Among L1–L4, L1 possessed the highest binding constant and sensitivity toward F− implying the importance of the linking PEG chain. L1 was demonstrated
由聚乙二醇(PEG)链,连接新bispyrenyl硫脲L1 - L3,和甲氧苯硫脲芘,L4,合成。当与F结合-在CHCl 3,L1 - L3表现出强准分子发射带(我ë)和弱单体发射带(我中号),而L4显示两频带的相同的强度。但是,在荧光光谱观察到很少或没有变化L1在添加OH -,ACO -,BZO -,H 2 PO 4- ,氯- ,溴-和我- 。因此,仅F -诱导的芘受激准分子的形成。作业的地块表现出1/1或2/2络合L1为F - 。的比率我ë /我中号的L1 ·女-复杂都依赖于浓度L1,这意味着二聚L1经由分子间形成受激准分子进行。间L1 - L4,L1具有朝向F中的最高的结合常数和灵敏度-暗示连接PEG链的重要性。L1被证明是适用于F优异的探针-在CHCl 3与检测限为46.2微克/升。