Crystal Structure and Binding Properties of a New Molecular Clip Based on Diethoxycarbonyl Glycoluril: C_(42)H_(36)N_6O_6

A new molecular clip based on diethoxycarbonyl glycoluril 5： C42H36N6O6, has been synthesized and characterized by single-crystal X-ray diffraction. The crystal belongs to orthorhombic, space group Pbca with a = 12.7639（5）, b = 16.9727（7）, c = 34.2069（14） A, V = 7410.5（5） A3, Z = 8, Dc= 1.292 g/cm3, p（MoKa） = 0.088 mm-1, F（000） = 3024, the final R = 0.0655 and wR = 0.1566 for 5123 observed reflections with I 〉 2tr（/）. The crystal structural analysis shows that intermolecular C-H...O and C-H...N hydrogen bonds stabilized the whole crystal structure. The binding study by fluorescence spectroscope titration showed that the title molecule can selectively recognize Fe3~ with fluorescence quenching.

Structure and Fluorescence Property of a 2D Macrometallacycle Supramolecular Network [Zn_2(2-mBIM)_2(SUC)_2]_n

A zinc（Ⅱ） coordination polymer [Zn2（2-mBIM）2（SUC）2]n （1, 2-mBIM = bis（2-methylimidazo-1-yl） methane, SUC = succinate anion） has been synthesized and characterized by X-ray diffraction. Complex 1 crystallizes in the triclinic space group P1 with a = 9.4871（8）, b = 12.9789（5）, c = 14.0230（5）, α = 90.474（1）, β = 90.3560（10）, γ = 109.691（1）°, V = 1529.94（15）3 , Z = 2, Dc = 1.553 mg/m3 , μ = 1.63 mm-1 , F（000） = 736, the final R = 0.0645 and wR = 0.0951 for 4067 observed reflections with I 〉 2σ（I）. Each Zn atom was coordinated by two individual 2-mBIM ligands in a cis-conformation and two monodentate coordinated succinate anions in a gauche conformation, resulting in the formation of a two-dimensional supramolecular network containing a cationic 16-membered macrometallacycle and a 28-membered macrometallacycle. The result also indicates that the conformation of the ligands has a strong influence on the structure of the supramolecular network.

Effect of Annealing Temperature on the Ferroelectric Properties of BiFeO_3 Thin Films Prepared by Sol-gel Process

Sol-gel process was adopted to prepare BiFeO3 films.BiFeO3 films were deposited on LaNiO3 coated Si（100） substrates annealed at 500 and 550 ℃,respectively.The X-ray diffraction results reveal that BiFeO3 film has a rhombohedrally distorted perovskite structure with space group R3c.The film annealed at 500 ℃ has larger remnant polarization（Pr） of 35.3 μC/cm2.For the film annealed at 550 ℃,smaller remnant polarization of Pr=4.8 μC/cm^2 is observed for its low breakdown electric field.Lower leakage conduction is observed in the film annealed at 500 ℃ at low applied field.

Synthesis and X-Ray Structure of New Anticancer Nucleosides Based on 1-((2-Hydroxyethoxy)methyl)-5-(phenylthio)-1H-1,2,4-triazole-3-carboxamide

A pair of new anticancer nucleosides based on 1,2,4-triazole nucleosides and 1-((2-hydroxyethoxy) methyl)-5-(phenylthio)-1H-1,2,4-triazole-3-carboxamide have been synthesized, and have given the corresponding products in excellent yields. Its structures and conformations were confirmed by single crystal X-ray diffraction.

Polyaniline Supported 12-Tungstosilicic Acid as the Catalyst for Acetals and Ketals Synthesis

A novel environmental friendly catalyst, H4SiW12O40/PAn was prepared and identified by FT-IR, XRD and TG/DTA. The optimal synthetic protocol was a PAn to H4SiW12O40 mass ratio of 1 ： 1, a 20 mL of methanol and a reaction time of 2 h at reflux. It was used in catalytic synthesis of ten important ketals and acetals with a high catalytic activity. With an aldehyde/ketone to glycol molar ratio of 1 ： 1.5 and a 1 wt% catalyst loading, the yields of ketals and acetals could reach 60.0%- 93.8 % after 1 h.

Synthesis of bovine serum albumin imprinted Mn:ZnS quantum dots

A novel bovine serum albumin （BSA） imprinted Mn-doped ZnS quantum dots （Mn：ZnS QDs） is firstly reported. The molecular imprinted polymer （MIP） functionalized Mn：ZnS QDs （Mn：ZnS @SiO2@MIP） include the preparation of Mn：ZnS QDs, the coating of silica on the surface of Mn：ZnS QDs, and the functional polymerization by sol-gel reaction using 3-aminophenylboronic acid as the functional and cross-linking monomer in the presence of BSA （Mn：ZnS@SiO2@MIP-BSA）, and then the elution of the imprinted BSA on the surface of Mn：ZnS@SiO2 QDs. The results showed that the phosphorescence of Mn：ZnS@SiO2@MIP is stronger quenched by BSA than that of non-imprinted one （Mn：ZnS@SiO2@NIP）, indicating that the selectivity of the imprinted Mn：ZnS quantum dots toward BSA is superior to that of non-imprinted one.