聚芳醚醚酮和磺化聚芳醚醚酮的热分解动力学

用热重法(TG)研究了聚芳醚醚酮(PEEK)和磺化改性的聚芳醚醚酮(S-PEEK)的热分解动力学,计算了热分解动力学参数,结果表明PEEK及S-PEEK的热分解符合无规引发裂解模型。进一步考察了磺化对PEEK热分解的影响,结合温度程序裂解色谱-质谱结果,探讨了S-PEEK的TG曲线上呈现二个失重台阶的意义。     

Chiral Recognition of Tryptophan Enantiomers Based on β‐Cyclodextrin‐platinum Nanoparticles/Graphene Nanohybrids Modified Electrode

The nanohybrids which based on β‐cyclodextrin, platinum nanoparticles and graphene (β‐CD‐PtNPs/GNs) were successfully synthesized and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FT‐IR) and electrochemical impedance spectroscopy (EIS). Then they were used to construct a simple and reliable chiral sensing platform to interact with tryptophan (Trp) enantiomers. Differential pulse voltammetry (DPV) was used to investigate the stereo selectivity of β‐CD‐PtNPs/GNs to Trp enantiomers. After interaction, the obvious difference of peak currents of L‐Trp and D‐Trp was obtained, indicating this strategy could be employed to chiral recognition of Trp enantiomers. Under the optimum conditions, the chiral sensor exhibited a good linear response to Trp enantiomers in a linear range of 5.0×10^?5 to 5.0×10^?3 M with a low limit of detection of 1.7×10^?5 M (S/N=3). This approach provided a new available platform to recognize and determine Trp enantiomers.     

铂配合物磷光材料在OLED中的应用研究进展

有机发光二极管（OLED）开发和商业化的一项关键突破是将磷光材料用作发光材料,与荧光材料相比,磷光材料的内部量子效率提高了3倍。在所有磷光材料中,方形平面铂（Ⅱ）配合物由于高的结构刚性而表现出磷光量子产率高、磷光寿命短以及化学和热稳定性高等优点,这对于实现具有长使用寿命的OLED至关重要。另一方面,铂（Ⅱ）配合物由于其平面配位几何形状,可以轻松构建二齿、三齿或四齿配体,从而可显著调控铂（Ⅱ）配合物的光物理性质。除此之外,含多个Pt中心可以进一步增强分子的自旋轨道耦合作用从而增强其磷光发射。基于以上考虑,该文对含二齿、三齿和四齿配体的单核及多核铂（Ⅱ）配合物在OLED发光材料中的应用进行了总结,并讨论了配体结构对器件性能的影响。最后,对铂（Ⅱ）配合物材料的研究难点进行了分析,对其未来的发展趋势进行了展望。     

Study of fluorescence properties of several 4-acyl pyrazolone derivatives and their Zn (II) complexes

Fluorescence properties of four 4-acyl pyrazolone derivatives (H(2)L(1)=N-(1,3-diphenyl-4-propylene-5-pyrazolone)-salicylidene hydrazone (1), H(2)L(2)=N-(1,3-diphenyl-4-ethylene-5-pyrazolone)-salicylidene hydrazone (2), H(2)L(3)=N-(1,3-diphenyl-4-benzylidene-5-pyrazolone)-salicylidene hydrazone (3), H(2)L(4)=N-(1,3-diphenyl-4-phenylethylene-5-pyrazolone)-salicylidene hydrazone (4), and their Zn (II) complexes: (Zn(H(2)L(1))(2) (5), Zn(H(2)L(2))(2).3CH(3)OH (6), Zn(H(2)L(3))(2).2CH(3)OH (7), and Zn(4)(H(2)L(4))(4) (8)) were studied at room temperature. It was revealed that these compounds show different fluorescence properties both in the solid state and in solution. Density functional theory (DFT) calculations on ligands 1-4 were also performed to further understand their emission properties. The calculation results indicate that the energy gaps between the highest occupied molecular orbitals (HOMOs) and the lowest unoccupied molecular orbitals (LUMOs) of these ligands are in the following order 1>2>3, which is consistent with the redshift of the emission spectra.     

Simultaneous determination of six α‑dicarbonyl compounds in traditional Chinese medicines using high-performance liquid chromatography-fluorescence detector with pre-column derivatization

A reliable method for determination of six α-dicarbonyl compounds in traditional Chinese medicines was first developed and validated by high-performance liquid chromatography-fluorescence detector with pre-column derivatization. α-Dicarbonyl compounds in traditional Chinese medicines were extracted and derivatized with 2,3-diaminaphthalene. The derivatization procedure of six α-dicarbonyl compounds was confirmed by high-resolution mass spectrometry. The limits of quantitation for six α-dicarbonyl compounds ranged from 3.70 × 10⁻³ to 2.21 × 10⁻² μM. The established method showed good linearity (regression coefficient > 0.9990), precision (relative standard deviation < 3.37%), and high recovery (97.8%∼113.1%). The developed method was successfully applied to detect the six α-dicarbonyl compounds in traditional Chinese medicines. The result exhibited six α-dicarbonyl compounds was found in the 15 kinds of traditional Chinese medicines, which suggested us that the determination of α-dicarbonyl compounds should be paid more attention in the quality control of traditional Chinese medicines.     

酞菁铜旋涂薄膜的制备与气敏性能研究

本文制备了2,9,16,23-四异丙氧基和2,9,16,23-四对甲基苯氧基2种酞菁铜(CuPc(OC₃H₇-i)₄, CuPc(OC₇H₇)₄,简称为烷氧基酞菁铜和苯氧基酞菁铜),并在基片上成功制得了二者的旋涂膜。利用AFM(Atomic force microscope)、UV-Vis和FTIR对薄膜的表面形貌和谱学性质进行了分析。结果表明,以一定的旋转速度进行涂膜,可以获得较为均匀的酞菁铜薄膜,并且2种取代基团的酞菁表面形貌有着较为明显的差别。在室温下测试了2种酞菁薄膜对甲醇和乙醇气体的敏感性能,结果显示薄膜对测试的醇类有较高的灵敏度,对乙醇的灵敏度要大于甲醇,在同种测试气氛下苯氧基酞菁铜薄膜的气敏性能要高于烷氧基酞菁铜薄膜。2种薄膜对浓度为30 μL·L^-1乙醇气体的响应和恢复时间分别在30 s和60 s内。     

ALa9(SiO4)6O2.5(A=Ca，Sr，Ba)的合成及其电性能

利用溶胶-凝胶法在850 ℃合成了硅酸盐氧基磷灰石ALa₉(SiO₄)₆O_2.5(A=Ca、Sr和Ba),经XRD表征所得产品为磷灰石相。以电化学阻抗谱研究了ALa₉(SiO₄)₆O_2.5的导电性能,发现A的原子半径越大,体系的电导率越高,活化能却减小。在700 ℃时BaLa₉(SiO₄)     

超短光脉冲的单延迟三次相关测试

超短光脉冲的对称性可以用单延迟三次相关测试来测定,若再与二次相关测试所得的结果进行比较,可以得到更多的关于脉冲形伏的信息,经测定,Nd:YAG被动锁模激光器的脉冲形状可近似认为高斯-指数形,三次相关函数宽度为22.3ps+15.7ps,对应脉冲宽度为27ps,脉冲的前沿陡于后沿。 关键词：     

Composition and antimicrobial activity of the essential oil from the branches of Jacaranda cuspidifolia Mart. growing in Sichuan,China

This study represents the first report on the chemical composition and antimicrobial activity of the essential oil from the branches of Jacaranda cuspidifolia Mart. Thirty-three compounds were identified by Gas Chromatography-Mass Spectrometry (GC-MS) and the major constituents of the essential oil were Palmitic acid (31.36%), (Z) ? 9,17-Octadecadienal (12.06%), Ethyl palmitate (3.81%), Perhydrofarnesyl acetone (2.07%), γ-Maaliene (1.88%), and Cedro (1.42%) and 9,12-Octadecadienoic acid ethyl ester (1.42%). The in vitro antimicrobial activities of the essential oil were evaluated by the disc diffusion method, and the inhibition zones against Escherichia coli, Staphylococcus aureus and Candida albicans were 7.10, 8.20 and 7.25 mm, respectively. The oil showed moderate activities against E. coli, S. aureus and C. albicans with minimum inhibition concentration (MIC) values of 17.3 mg/mL, 12.9 mg/mL and 16.0 mg/mL, respectively.     

一种多样品臂扫频光学相干层析系统

报道了一种多样品臂扫频光学相干层析(OCT)系统,使用光开关将多路样品臂接入同一个扫频OCT成像系统,通过光开关的快速切换,实现了多路同时实时成像.设计并展示一个双样品臂的成像系统,两路成像性能均与典型扫频OCT系统相当;通过两路实时成像结果相结合,在仅使用少量额外硬件的情况下,实现了对成像视场的成倍扩展.