Synthesis of Various Water-Soluble G60 Derivatives and Their Superoxide-Quenching Activity

In order to examine the utility of fullerene as a medicinal application, we evaluated the reaction between fullerene derivatives and active oxygen species in vitro. This paper describes the synthesis of various water-soluble C₆₀ derivatives (cationic and anionic) and evaluation of their superoxide (O₂^-) quenching activity. Cationic C₆₀ derivatives showed fairly high efficiency.     

Synthesis of Various Water-Soluble C60 Derivatives and Their Superoxide-Quenching Activity

In order to examine the utility of fullerene as a medicinal application, we evaluated the reaction between fullerene derivatives and active oxygen species in vitro. This paper describes the synthesis of various water-soluble C₆₀ derivatives (cationic and anionic) and evaluation of their superoxide (O₂^-) quenching activity. Cationic C₆₀ derivatives showed fairly high efficiency.     

Synthesis of Various Water-Soluble C60 Derivatives and Their Superoxide-Quenching Activity

Abstract

In order to examine the utility of fullerene as a medicinal application, we evaluated the reaction between fullerene derivatives and active oxygen species in vitro. This paper describes the synthesis of various water-soluble C₆₀ derivatives (cationic and anionic) and evaluation of their superoxide (O₂ ^?) quenching activity. Cationic C₆₀ derivatives showed fairly high efficiency.     

Synthesis of Heterocycle-Containing [60]Fullerene Derivatives

Fullerene functionalization with heterocycles is reviewed, focusing attention on cycloaddition methodology and oxidative heterocyclization.¹     

Synthesis of Heterocycle-Containing [60]Fullerene Derivatives

Abstract

Fullerene functionalization with heterocycles is reviewed, focusing attention on cycloaddition methodology and oxidative heterocyclization. ^{1 1}This paper was presented before the Symposium 3 on ‘Expanded Horizons of Fullerene Science and Technology’ organized by L. Y. Chiang, E.Osawa, H. Terrones and M. Saunders at the 4th International Conference on Advanced Materials (ICAM-IV), Aug. 27 to Sept. 1, 1995, Cancun, Mexico.

     

双二硫代亚乙基四硫代富瓦烯衍生物的合成及其LB膜的制备

合成了带双烃锘及双甲酸甲酯基取代的两种双二硫代亚乙基甲硫代富瓦烯（ＢＥＤＴ＝－ＴＴＦ）的衍生物及其的ＴＣＮＱ的ＣＴ－络合物。制备瓣Ｌ膜并测试膜的导电率。由于单分子膜与各层膜相比分子列紧密程度不同。平行ＬＢ 导电率比垂直于ＬＢ膜方向的导电率高近１０＾７个数量级。     

Highly Water Soluble C60 Derivatives: A New Synthesis

Unprecedented protocol, consisting in reduction of Buckminsterfullerene with Na/K alloy and successive stirring in presence of O₂, affords polyhydroxylated fullerenols which are highly water soluble, from strongly basic to medium acidic conditions. The products have been characterized by means of cross polarization magic angle spinning (CPMAS) NMR, ¹H-NMR, electron, FT-IR, Raman and mass spectroscopies. Possible paths of reaction and the role of molecular oxygen in fullerene cage-oxidation are discussed.     

Highly Water Soluble C60 Derivatives: A New Synthesis

Abstract

Unprecedented protocol, consisting in reduction of Buckminsterfullerene with Na/K alloy and successive stirring in presence of O₂, affords polyhydroxylated fullerenols which are highly water soluble, from strongly basic to medium acidic conditions. The products have been characterized by means of cross polarization magic angle spinning (CPMAS) NMR, ¹H‐NMR, electron, FT‐IR, Raman and mass spectroscopies. Possible paths of reaction and the role of molecular oxygen in fullerene cage‐oxidation are discussed.     

Synthesis of Starch-Stabilized Silver Nanoparticles and Their Antimicrobial Activity

In this study, silver nanoparticles were prepared using silver nitrate as the metal precursor, starch as protecting agent, and sodium borohydride (NaBH₄) as a reducing agent by the chemical reduction method. The formation of the silver nanoparticles was monitored using ultraviolet-visible absorption spectroscopy, cyclic voltammetry, and particle size analyzer and characterized by transmission electron microscopy (TEM) and x-ray diffraction (XRD). Synthesis of nanoparticles were carried out by varying different parameters, such as reaction temperature, concentration of reducing agent, concentration of silver ion in feed solution, type and concentration of the stabilizing agent, and stirrer speed expressed in terms of particle size and size distribution. Dispersion destabilization of colloidal nanoparticles was detected by Turbiscan. It was observed that size of the starch stabilized silver nanoparticles were lower than 10 nm. The microbial activity of synthesized silver nanoparticles was examined by modified Kirby-Bauer disk diffusion method. Silver nanoparticles were tested for their antibacterial activity against Gram negative bacteria such as Escherichia coli, Pseudomonas aeruginosa, and Gram positive bacteria such as Staphylococcus aureus and Staphylococcus epidermidis. High bacterial activity was observed at very low concentrations of silver (below 1.39 μg/ml). The antifungal activity of silver nanoparticles has been assayed against Candida albicans.     

水溶性壳低聚糖抑菌性能研究

壳聚糖及其衍生物壳低聚糖均具有广谱抑菌性能,但相对分子质量对壳聚糖衍生物抑菌活性的影响仍存在分歧。选取几种不同相对分子质量的水溶性壳低聚糖对金黄色葡萄球菌（staphyloccocus aureus）、大肠杆菌（escherichia coli）和黑曲霉菌（aspergillus niger）进行抑菌实验,探究相对分子质量对壳低聚糖抑菌活性的影响。实验结果表明：相对分子质量对水溶性壳低聚糖的抑菌活性有一定影响,但无特定的变化规律,其中相对分子质量为2.00×103的壳低聚糖表现出相对较好的抑菌活性;壳聚糖及其壳低聚糖对金黄色葡萄球菌的抑菌活性最好,黑曲霉菌次之,对大肠杆菌的抑菌活性最差。 关键词：壳聚糖;水溶性壳低聚糖;相对分子质量;抑菌性能     

水溶性三重响应智能聚合物的合成与性能

在CuCl/Me6TREN催化体系下,以含2-溴异丁酰基团的偶氮苯衍生物引发甲基丙烯酸-N,N-二甲氨基乙酯（DMAEMA）的原子转移自由基聚合（ATRP）,得到新型水溶性三重响应智能聚合物。该聚合物可同时对光、热和pH等外部环境刺激产生响应性。利用凝胶色谱（GPC）表征聚合物的分子量及其分布。该聚合物常温下溶于水,其...     

Synthesis, Photophysical and Photovoltaic Properties of New [60]Fullerene Pyrrolidine Derivatives

Two new [60]fullerene pyrrolidine derivatives 2 and 3 were synthesized and characterized by ¹H NMR, ¹³C NMR and MS. Their photophysical processes have been investigated by using laser flash photolysis. The experiments show quenching of oligomer singlet excited state and the evidence of the fullerene singlet excited emission. And the intramolecular of electron transfer and also energy transfer of 2 and 3 occurred and the triplet excited state of fullerene moiety in 2 and 3 have different lifetime due to their different structures. A photovoltaic device using compound 2 as the only photoactive material has also been investigated which showed the energy conversion efficiency is 0.011%.     

氧化锌插层蒙脱土纳米复合材料的制备及其光催化活性

采用一种简便的方法制备了氧化锌插层蒙脱土纳米复合材料。首先将蒙脱土充分充水后进行冷冻,具有层状结构的蒙脱土充水后会发生膨胀,部分从块状的蒙脱土上剥离形成超薄的片层结构。然后通过可控的水热过程使氧化锌纳米粒子进入蒙脱土层间或覆盖于表面。结果表明,直径1~3 nm 的纳米氧化锌会插层于蒙脱土的层间,而直径达10~25 nm的纳米氧化锌则会镶嵌在蒙脱土表面。该纳米复合材料对模拟污染物甲基橙具有优异的光催化性能。     

Hydroxyl Radical Scavenging and Producing Activities of Water-Soluble Malonic Acid C60

Abstract

The effects of several water-soluble malonic acid derivatives of C₆₀ with different addition number (M1～M4) on hydroxyl radical were studied by ESR method. It was shown that the OH signal produced by the Fenton system could be remarkably reduced by M1 and M2, but could not by M3 and M4. The action of M1 and M2 was dose-dependent, and M1 was found to be more effective than M2. In addition, under irradiation and in the presence of oxygen, M2 could produce hydroxyl radicals. These data indicate that the quenching activity of the malonic acid derivative of C₆₀ was closely related to the integrity of conjugated double bonds, and some C₆₀ derivatives with specific structures might act as the eliminator or producer of hydroxyl radicals under different conditions.     

Hydroxyl Radical Scavenging and Producing Activities of Water-Soluble Malonic Acid C60

The effects of several water-soluble malonic acid derivatives of C₆₀ with different addition number (M1∼M4) on hydroxyl radical were studied by ESR method. It was shown that the OH signal produced by the Fenton system could be remarkably reduced by M1 and M2, but could not by M3 and M4. The action of M1 and M2 was dose-dependent, and M1 was found to be more effective than M2. In addition, under irradiation and in the presence of oxygen, M2 could produce hydroxyl radicals. These data indicate that the quenching activity of the malonic acid derivative of C₆₀ was closely related to the integrity of conjugated double bonds, and some C₆₀ derivatives with specific structures might act as the eliminator or producer of hydroxyl radicals under different conditions.     

基于氨基胍类衍生物及其金属配合物

胍类化合物是非常重要的有机含氮化合物,它们可广泛应用于医药、兽药、杀菌剂、表面活性剂、离子液体等领域。本文在简单概述了胍类衍生物的合成方法和应用研究的基础上,重点介绍了单氨基胍衍生物、双氨基胍衍生物、三氨基胍衍生物的合成与应用,还详细介绍了胍类金属配合物的研究进展。     

镧系六铝酸盐催化剂的制备及其催化甲烷燃烧活性研究

用共沉淀法制备了镧系六铝酸盐LaMnxAl12-xO19(x=0、1、2、3、4、5、6)催化剂,通过X射线衍射、差热分析、扫描电镜和比表面积分析等实验技术及甲烷催化燃烧,对催化剂的结构和性质进行了考察。研究了锰离子掺杂对催化剂结构以及甲烷催化燃烧活性的影响。结果表明,催化剂在1200℃焙烧后可以形成完整的六铝酸盐晶型,且具有较高的催化性能和高温稳定性,不同含量的Mn离子掺杂对催化剂的比表面积和活性有较大的影响。LaMn2Al10O19催化剂具有较好的活性,其起燃温度(T10%/℃)为506℃,完全转化温度(T90%/℃)为696℃。     

Synthesis of Mixed-Phase TiO2 Powders in Salt Matrix and Their Photocatalytic Activity

Three mixed-phase TiO₂ powders, containing ～80 volume % anatase and ～20 volume % rutile, were prepared from amorphous titanium hydroxide and three different salt matrices—pure sodium chloride, pure Na₂CO₃, and pure disodium hydrogen phosphate (DSP). Amorphous titanium hydroxide and salt mixtures were heat treated at 875°C in a rapid thermal annealing system for different times, according to the time–temperature phase transformation graphs. Time-dependent UV degradation of aqueous solutions of methylene blue dye (15 ppm) in the presence of mixed-phase powders was used to monitor the activity of the catalysts. Microstructural study of the powders by scanning electron microscope and transmission electron microscope combined with phase analysis by XRD and optical absorbance by UV-absorption spectroscopy indicated that the higher photocatalytic activity of the powder obtained from pure DSP salt could be explained by its smaller rutile particle size and anatase–rutile interparticle bonding.     

水溶性油酸酰胺型防锈剂的合成及在切削液中的应用

以油酸、顺丁烯二酸酐、二乙醇胺为原料,合成了油酸酰胺基非离子表面活性剂ＯＭＡ。研究发现,ＯＭＡ水溶性极好,耐水解能力强,在水中对钢和铸铁有优良的防锈性能,对铜也有一定的防锈效果。用于多数型水基合成切削液中,试验结果满意。