叔丁喘宁的合成工艺改进

针对目前国内叔丁喘宁合成收率较低的情况, 提出一条新的合成路线. 以3, 5 二羟基苯甲酸为起始原料, 经过酯化、苄基保护、水解、酰化、溴代、胺化、还原和脱苄等八步反应合成叔丁喘宁, 总收率达33 15%. 所有原料全部国产化, 各步反应简单, 最后五步反应总收率达48 04%, 大大降低了工艺成本, 适合工业生产.     

钙钛矿型稀土纳米复合氧化物的制备与应用

纳米级钙钛矿型稀土复合氧化物在许多领域表现出了突出的作用。本文介绍了钙钛矿型稀土纳米复合氧化物的主要合成方法，说明其优缺点，简要分析了该类材料的性能用途，并对其今后的发展方向提出了几点建议。     

广州地区菜地土壤有机氯农药残留与分布

2009年4～6月采集了广州地区菜地土壤表层样品,利用ASE萃取技术,使用GC方法测定了样品中的六六六（α-HCH,β-HCH,γ-HCH,δ-HCH）、滴滴涕（4,4＇-DDE,4,4＇-DDD,4,4＇-DDT）、氯丹、艾氏剂、狄氏剂等17种有机氯农药的检出率和含量。结果表明：HCHs的含量介于nd～2.04μg/kg之间,平均含量为1.12μg/kg。DDTs含量在0.33～2.88μg/kg,平均值为1.59μg/kg,其他10种有机农药也有不同程度的检出,同国内其他地区相比,其残留水平偏低,对生态环境和人体健康无明显危害。     

Syntheses,characterization, and luminescence of two lanthanide complexes [Ln2（acetate）6（HeO）4]·4H2O （Ln=Tb（1）, Sm（2））

Two dinuclear compounds [Ln2（acetate）6（H2O）4]-4H2O （Ln=Tb（1）, Sm（2）） were obtained by the hydrothermal reaction of Ln2O3 with malonic acid at 150 ℃. Both compounds were characterized by elemental analyses, infrared spectra, and single crystal X-ray diffraction. The results showed that complexes 1 and 2 were isomorphous and crystallize in triclinic space group P 1. The coordination geometry around Ln（Ⅲ） ions in the complexes 1 and 2 was a distorted tricapped trigonal prism with a nine coordination. In the crystal, the molecular organization was further stabilized by well-defined weak hydrogen bonding interactions between the neutral dinuclear molecular units that led to the formation of a three-dimensional network. The fluorescence properties of the two complexes 1 and 2 in organic solvents were also studied. The results show that the ligand acetate favored energy transfer to the emitting energy level of Tb（Ⅲ） in complex 1. Some factors that influence the fluorescent intensity were also discussed in the article.