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Hydrogen bonded foldamer-bridged biscoumarins:A UV-Vis absorption and fluorescent study of the solvent effect
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作者 LU ZhengQuan ZHU YuanYuan +2 位作者 LIN JianBin jiang xikui LI ZhanTing 《Chinese Science Bulletin》 SCIE EI CAS 2010年第25期2870-2878,共9页
Three arylamide-bridged biscoumarin derivatives 1-3 have been designed and prepared. Compounds 1 and 2 are induced by the intramolecular N?H…O and N·H…F hydrogen bonding to possess a helical conformation,and 3 ... Three arylamide-bridged biscoumarin derivatives 1-3 have been designed and prepared. Compounds 1 and 2 are induced by the intramolecular N?H…O and N·H…F hydrogen bonding to possess a helical conformation,and 3 is induced to have an extended conformation. A comparison of their absorption and fluorescent spectra in a variety of solvents of a wide range of polarity with those of control compound 4 reveals that,for foldamers 1 and 2,the intramolecular hydrogen bonding and the helical conformations exist in most solvents,but do not exist or are very weak in DMF and DMSO. 展开更多
关键词 紫外可见吸收光谱 分子内氢键 溶剂效应 荧光光谱 极性化合物 螺旋构象 DMSO 衍生物
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Complexation of two non-fully hydrogen bonded aromatic hydrazide heptamers toward n-octyl-α-L-glucopyranoside in chloroform
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作者 DU Ping XU YunXiang +1 位作者 jiang xikui LI ZhanTing 《Science China Chemistry》 SCIE EI CAS 2009年第4期489-496,共8页
Two aromatic hydrazide haptamers have been prepared,with both consisting of two hydrogen bonded folded segments. Compared to their fully hydrogen bonded analogues,the flexibility of their backbones increases due to la... Two aromatic hydrazide haptamers have been prepared,with both consisting of two hydrogen bonded folded segments. Compared to their fully hydrogen bonded analogues,the flexibility of their backbones increases due to lack of one or two intramolecular hydrogen bonds at the middle aromatic unit. (2D) 1H NMR,circular dichroism and fluorescent studies revealed that both oligomers moderately complex n-octyl-α-L-glucopyranoside in chloroform. 展开更多
关键词 molecular recognition hydrogen bonding FOLDAMER HYDRAZIDE SACCHARIDE
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