A Novel Organic—Inorganic Complex：Synthesis and Crystal Structure of [Ca（DMSO）5（H2O）]2 SiMo12O40

It is becoming a focus to synthesize and assemble organic-inorganic materials, especially, to synthesize charge-transfer complexes formed by polyoxometalate and organic donors. They have attracted much attention because such complexes are active in their electric, magnetic and optic properties1-4, many investigations about them have been done and some crystal structures of them were reported5-6. But, the disadvantage of these crystals is instability at room temperature. According to the view…     

On the Criteria of Instability for Electrochemical Systems

Both cyclic-voltammetry-based and impedance-based experimental criteria that have been developed recently for the oscillatory electrochemical systems are critically appraised with two typical categories of oscillators.Consistent conclusions can be drawn by the two criteria for the category of oscillators that involve the coupling of charge transfer mainly with surface steps(e.g.ad-and desorption)such as in the electrooxidation of C1 organic molecules.Whereas,impedance-based criterion is not applicable to the category of oscillators that involve the coupling of charge transfer mainly with mass transfer(e.g.diffusion and convection) such as in the Fe(CN)6^3- reduction accompanying periodic hydrogen evolution.The reason is that the negative impedance cannot include the feedback information of convection mass transfer induced by the hydrogen evolution.However,both positive and negative nonlinear feedbacks,i.e., the diffusion-limited depletion and convection-enhanced replenishment of the Fe(CN)6^3- surface concentration,that coexist between the bistability,i.e.,Fe(CN)6^3- reduction with and without hydrogen evolution at lower and higher potential sides respectively,are all reflected in the crossed cyclic voltammogram(CCV).It can be concluded that the voltammetry-based criterion(in time domain)is more intuitive,less time-consuming and has a wider range of applications than the impedancebased one (in frequency domain).     

(NH_4)_2SiF_6预处理改善SBA-15介孔材料的水热稳定性

(NH4)2SiF6 预处理可对 SBA-15 介孔材料的表面缺陷进行补硅修正以及表面疏水化, 从而明显改善 SBA-15 材料的水热稳定性. 结果表明, 用摩尔分数为 5% 的 (NH4)2SiF6 水溶液, 按引入 1% 的 SiO2 计量对 SBA-15 进行处理后, 其水热稳定性明显改善, 在 100 ?C 沸水中处理 14 d, 或在 800 ?C 下用 100% 水蒸气处理 12 h 后, 均保持较好的介观有序度、形貌及六方孔道结构, 比表面积分别高达 310 和 213 m2/g, 但 (NH4)2SiF6 处理量过高, SBA-15 水热稳定性反而下降.     

卤离子溶液中邻香兰素邻苯二胺对铜的缓蚀作用

应用恒电位稳态极化和交流阻抗技术研究了希夫碱—邻香兰素邻苯二胺 (V_oPh_V)在中性NaCl或NaBr溶液中对金属铜阳极溶解和腐蚀的缓蚀作用 .通过比较铜在空白溶液与含有V_o_Ph_V溶液中的电化学行为解释了V_o_Ph_V的缓蚀机制 .此外还研究了V_o_Ph_V自组装膜在Na Cl溶液中对铜腐蚀的缓蚀效应 .     

新型可溶性空心酞菁磺酰类化合物的合成及性质研究

以空心酞菁(H2Pc)为原料,采用取代基转化法,经过氯磺酰化和酯化合成了空心酞菁磺酰氯和空心酞菁磺酸对甲氧基苯酯,经元素分析,1H NMR,IR,UV-Vis等方法,确定了空心酞菁磺酰氯和空心酞菁磺酸对甲氧基苯酯的组成分别为H2Pc(SO2Cl)4和H2Pc(SO2-p-OC6H4OCH3)4.结果表明,此两种产物在空心酞菁的苯环上引入取代基后,长波吸收增强,溶解度高,热稳定性良好.     

偏钨酸-2,6-二甲基吡啶分子间化合物(Hdmpy)11H(h2W12O40)2·6H2O的合成、电化学性质和晶体结构

偏钨酸-2;6-二甲基吡啶分子间化合物(Hdmpy)11H(h2W12O40)2·6H2O的合成、电化学性质和晶体结构     

Synthesis and Characterization of a Novel Biomaterial： Maleic Anhydride-modified Poly（dl-lactic acid）

A novel modified poly(dl-lactic acid) (PDLLA) was obtained by covalently grafting of maleic anhydride onto the backbone of PDLLA, attempting to improve PDLLA‘s hydrophilicity and cell affinity and to provide reactive groups for further chemical modification. FTIR, ^13 C NMR and DSC were used to characterize the maleic anhydride-modified PDLLA.     

Construction and Analysis of N-phosphoryl Peptide Libraries

N-Phosphoryl peptide libraries were constructed by transformation from homo-oligopeptide libraries, which was synthesized by self-assembly of amino acids with the assistance of phosphorus oxychloride. Electrospray ionization mass spectrometry (ESI-MS) was used to monitor the reaction.     

电化学方法研究多粘菌素B与磷脂酰胆碱的相互作用

采用电化学方法研究了一种多肽类抗生素多粘菌素B(PMB)与模拟生物膜硫醇-磷脂酰胆碱杂化双层膜之间的相互作用。PMB可与磷脂酰胆碱发生强相互作用,破坏双层膜结构,从而使膜的通透性升高。PMB的浓度、酸度、与膜的作用时间及膜中胆固醇的存在均影响二者的作用程度。另外,膜的自修复实验表明,被PMB破坏的双层膜电极在一定程度上可以在KCl溶液中重新自组装,且自修复的程度和修复时间及与之相互作用的PMB的浓度有关。     

壬基酚表面印迹聚合物微球的合成及分子识别特性

采用表面分子印迹技术,在二氧化硅微粒表面通过乙烯基三甲氧基硅烷接枝,以壬基酚(NP)为模板、α-甲基丙烯酸为功能单体制备了壬基酚印迹聚合物。扫描电镜及比表面分析仪测试结果表明制备的印迹聚合物呈均匀分散的微球,具有较大的比表面积。采用红外光谱表征印迹聚合物微球制备过程中的化学结构变化情况,并用平衡吸附法研究了聚合物对NP的结合性能与分子识别特性。研究结果表明,聚合物对壬基酚具有良好的结合亲和性,最大结合量可达184.6 mg/g。印迹聚合物对NP的吸附量高于其结构类似物对特辛基酚和双酚A的吸附量,表现出较高的选择性识别能力。