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Zhao, Yan,Yang, Zi Ming,Chi, Shao Ming,Gu, Juan,Yang, Yong Cun,Huang, Rong,Wang, Bang Jin,Zhu, Hong You Korean Chemical Society 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
A novel anthraquinone diamino-bridged bis($\beta$ -cyclodextrin) 2 was synthesized. The inclusion complexation behaviors of the native $\beta$ -cyclodextrin 1 and the novel bis($\beta$ -cyclodextrin) 2 with guests, such as acridine red (AR), neutral red (NR), ammonium 8-anilino-1-naphthalenesulfonate (ANS), sodium 2-(p-toluidinyl) naphthalenesulfonate (TNS) and rhodamine B (RhB) were investigation by fluorescence, circular dichroism and 2D NMR spectroscopy. The spectral titrations were performed in phosphate buffer (pH 7.20) at 25 ${^{\circ}C}$ to give the complex stability constants (Ks) and Gibbs free energy changes (−${\Delta}G^0$) for the stoichiometric 1:1 inclusion complexation of host 1 and 2 with guests. The results indicated that the novel bis($\beta$ -cyclodextrin) 2 greatly enhanced the original binding affinity of the native $\beta$ -cyclodextrin 1. Typically, bis($\beta$ -cyclodextrin) 2 showed the highest binding constant towards ANS up to 34.8 times higher than that of 1. The 2D NMR spectra of bis($\beta$ -cyclodextrin) 2 with RhB and TNS were performed to confirm the binding mode. The increased binding affinity and molecular selectivity of guests by bis($\beta$ -cyclodextrin) 2 were discussed from the viewpoint of the size/shape-fit concept and multipoint recognition mechanism.
Yan Zhao*,Zi Ming Yang,Shao Ming Chi,Juan Gu,Yong Cun Yang,Rong Huang,Bang Jin Wang,Hong You Zhu 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.5
A novel anthraquinone diamino-bridged bis(β-cyclodextrin) 2 was synthesized. The inclusion complexation behaviors of the native β-cyclodextrin 1 and the novel bis(β-cyclodextrin) 2 with guests, such as acridine red (AR), neutral red (NR), ammonium 8-anilino-1-naphthalenesulfonate (ANS), sodium 2-(p-toluidinyl) naphthalenesulfonate (TNS) and rhodamine B (RhB) were investigation by fluorescence, circular dichroism and 2D NMR spectroscopy. The spectral titrations were performed in phosphate buffer (pH 7.20) at 25 oC to give the complex stability constants (Ks) and Gibbs free energy changes (-DG0) for the stoichiometric 1:1 inclusion complexation of host 1 and 2 with guests. The results indicated that the novel bis(β-cyclodextrin) 2 greatly enhanced the original binding affinity of the native β-cyclodextrin 1. Typically, bis(b -cyclodextrin) 2 showed the highest binding constant towards ANS up to 34.8 times higher than that of 1. The 2D NMR spectra of bis(β-cyclodextrin) 2 with RhB and TNS were performed to confirm the binding mode. The increased binding affinity and molecular selectivity of guests by bis(β-cyclodextrin) 2 were discussed from the viewpoint of the size/shape-fit concept and multipoint recognition mechanism.
Proposed test of the gravitational Inverse-Square-Law at submillimeter scale using torsion pendulum
Zhong-Kun Hu,Jun Luo,Bang-Ming GU 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.45 No.1
Motivated by extra dimensional theories that predict new eects, experimental search for the deviation from Newtonian gravitational Inverse-Square Law (ISL) was proposed. We are testing the ISL at the separation of about 0.1 mm by means of a torsion pendulum with the at plate shape test and source masses. Electrostatic feedback force keeps the torsion pendulum in its rest position and the current force sensitivity is about 10က15 N.