β-环糊精与两性表面活性剂相互作用

用表面张力法研究了β-环糊精与十一烷基酰胺甲酸钠(C₁₁H₂₃CONHCOONa,SF)两性表面活性剂在不同温度下的包结作用。结果表明:SF的表面张力值(β)及表观临界胶束浓度(cmc^*)加入β-CD后增加,β-CD浓度越大,γ和cmc^*增加越多,且SF的cmc^*与β-CD浓度存在线性关系,随温度的升高,两性表面活性剂的表面张力值降低,意味着它们的表面活性随温度升高而增强。利用表面张力测定了β-CD-SF体系在不同温度下的包结形成常数K_a,进而求得了包结过程的焓变和熵变,结果表明,该过程是焓和熵均有利的过程,进一步说明疏水作用是形成包结物最重要的的作用力之一。     

α-(1H-1,2,4-三唑-1-基)-β-芳硫基取代苯酮的合成及生物活性研究

利用 2 (1H 1,2 ,4 三唑 1 基 ) 2 丙烯 1 酮 (2 )与取代硫酚或含巯基的杂环化合物进行 1,4 亲核加成 ,得到目标化合物 3,其结构经元素分析、核磁和红外光谱所证实 ,并对其进行了生物活性的测试 ,发现大部分化合物具有很好的抑菌活性 .结构与活性的关系表明不同的R1取代对其生物活性有较大的影响 ,当R1=(CH3 ) 3 C时 ,对小麦锈病的抑制活性要高于R1=Ar的活性 ,而Ar上不同的取代基对其活性影响不大     

KINETICS OF NON-ISOTHERMAL CRYSTALLIZATION OF POLY (ETHYLENE TEREPHTHALATE) MODIFIED BY POLY (ETHYLENE GLYCOL)

The non-isothermal crystallization kinetics of poly(ethylene terephthalate) (PET) modified by poly (ethlene glycol) (PEG) were determined by DSC. The dual linear regression method was used to evaluate the relationship between the reciprocal of t 1/2 ( the half life of crystallization) and the appropriate temperature variable. The parameters such as the activation energy (Ed) for transport, the equilibrium melting temperature (T_m~0),the nucleation parameter (ψ),themaximum crystallization temperature (T_(e, max)), and the kinetic crystallizability (G) for the copolyesters were obtained. The influence of the PEG content in PET chains on the parameters characterizing crystallization kinetics and crystallization thermodynamics was discussed.     

二碘化钐促进的 β-碲代酯(腈)的合成

本文报道在室温, 中性介质中研究二碘化钐在合成中的应用. 在二碘化钐作用下,二碲醚发生Te-Te键还原断裂, 生成碲负离子物种, 后者再与α,β-不饱和酯(腈)发生Michael加成, 得到β-碲代酯(腈), 产率较高.     

一类新型三线态敏化剂光物理行为的研究

本文对一类新型的三线态敏化剂N-甲基芳酰基甲基-β-萘骈噻唑啉的光物理行为进行了研究。测定了它们的吸收光谱、荧光和燐光量子产率。发现所研究的敏化剂比常用敏化剂有着较高的克分子吸收系数(～10~4),还具有较高的系间窜跃能力。本文还测定了存在不同敏化剂时,芪的顺、反异构化反应速度,以此评价化合物的敏化效率。认为这类化合物是有效的新型光敏化剂。     

二碘化钐作用下缺电子烯烃的还原偶联反应

室温下SmI2-HMPA-t-BuOH-THF体系能顺利地将丁烯二酸二酯还原偶联为1, 2, 3, 4-四烷氧基羰基丁烷, 同样条件下, 亚苄基氰乙酸乙酯,α-乙氧羰基肉桂酸乙酯, α-乙酰基肉桂酸乙酯和亚苄基丙二酸亚异丙酯等化合物也发生还原偶联反应得到相应的二聚体。     

高效液相色谱-串联质谱法同时测定表层水体中5类40种抗生素

建立了固相萃取-高效液相色谱-串联质谱（SPE-HPLC-MS/MS）同时检测表层水中5类40种抗生素的分析方法。水样经过滤、固相萃取柱富集净化后，以乙腈-0.2%（v/v）甲酸水溶液为流动相进行梯度洗脱，采用电喷雾电离源，在多反应监测、正离子模式进行定性定量分析。结果显示，40种抗生素在1~200 μg/L水平下线性关系良好，平均加标回收率为41.3%~112.6%。采用该方法对长江南京段表层水体进行检测，共检出13种抗生素，含量为13.4~780.5 ng/L，其中喹诺酮类抗生素恩诺沙星检出率达100%，大环内酯类抗生素克林霉素最高检出水平达739.4 ng/L。该法高效、灵敏、可靠，可用于实际水样中多种抗生素的分析。     

Utilization of a spiropyran derivative in a polymeric film optode for selective fluorescent sensing of zinc ion

Spiropyrans are the most studied families of func- tional materials due to their reversible structural con- version in response to external optical, chemical, and thermal stimulation[1]. Irradiation with ultraviolet light causes formation of an extended π-conjugation open form (merocyanine form) by heterolytic cleavage of the C (spiro)-O bond, which generates an intense ab- sorption in the visible region. Under the irradiating of visible light, the opened form will come back to the closed spi…     

STUDY ON MAGNETIC FIELD-INDUCED 0RIENTATI0N OF A CHIRAL SIDE-CHAIN LIQUID CRYSTAL POLYACRYLATE USING INFRARED DICHROISM

Magnetic field-induced orientation of a chiral side chain liquid crystalline polyacrylate(P-11) was studied by using IR dichroism. For the investigated P-11, it has been shown thatthe magnetic alignment takes place over the entire temperature range between its meltingpoint and clearing point and the orientation level is strongly temperature-dependent, thedevelopment with time of the magnetic orieatation follows an exponeotial-type relation,and the smectic phase state influences the thermal relaxation process in the absence of themagnetic field.     

Selenium Nanoparticles Prepared from Reverse Microemulsion Process

Selenium nanoparticles were prepared by a reverse microemulsion system. Sodium selenosulfate was used as selenium source. The results showed that hydrochloric acid concentration and reaction temperature had great influence on the morphology of products. The crystalline selenium nanowires and amorphous selenium nanorods were obtained in given condition.