β-环糊精键合滤纸的制备及在室温磷光分析中的应用

研究了β-环糊精修饰滤纸的制备方法及最佳制备条件，考察了修饰滤纸对16种有机物的室温磷光的增强效果，结果表明芴，苊，咔唑以及7，8-苯并喹啉的室温磷光信号有较大增强，与未修饰滤纸基质相比，4种化合物在修饰滤纸基质上的室温磷光检测灵敏度有了很大的改进。建立的方法用于水样中的咔唑和7，8-苯并喹啉的测定。     

1''-苯基-3''-甲基-5''-氧代吡唑-4''-基乙醛酸希土配合物的合成及性质研究

本文采用电导、pH滴定法研究了乙醇-水溶液中希土与1′-苯基-3′-甲基-5′-氧代吡唑-4′-基乙醛酸(简称H₂A)的配位反应.合成了15种新的希土固态配合物.通过元素分析、化学分析、水份分析确定了配合物的化学组成为RE(HA)₃·nH₂O(RE=Ce、Pr、Sm、Tm、Lu、n=1;RE=La、Nd、Eu、Gd、Tb、Dy、Ho、Er、Yb、Y,n=1-2).并对配合物的红外光谱、核磁共振谱、热稳定性、紫外光谱、溶解性及摩尔电导进行了测定.     

Rh／SiO_2上H_2的化学吸附

Ｒｈ／ＳｉＯ_２上Ｈ_２的化学吸附陈耀强，龚茂初，明虹，周建略，杜宗英，祝小红，陈豫（四川大学化学系，成都，６１００６４）关键词Ｒｈ／ＳｉＯ_２催化剂，Ｈ_２化学吸附，ＩＲＨ２在Ｒｈ上的化学吸附被认为是解离化学吸附［１］．而Ｒｈ－Ｈ的红外振动谱带是Ｈ２在...     

可溶性聚硅酸铝铁的制备及其在废水处理中的应用

以赤泥为原料,制备了高效无机高分子絮凝剂——聚硅酸铝铁(PSAF),并将该絮凝剂用于处理工业废水．研究絮凝剂的使用效果与投加量、投加方式、pH值、搅拌条件及水样本身性能间的关系．     

2-三氰基乙烯基蒽及其旋转异构体的量子化学研究

用量子化学从头算方法 ,在RHF/STO - 3G水平上 ,对 2_三氰基乙烯基蒽 (2_TCVA)分子进行了理论计算 ,优化得到了它的平衡几何构型 ,并计算了它的谐振动频率 .结果表明 :2_TCVA存在两种旋转异构体 :2_TCVA(1)和 2_TCVA(2 ) ,2_TCVA(2 )的总能量比 2_TCVA(1)的略高 .在PM3/CIS水平上计算了它们的电子光谱 ,得到了由基态到各激发态的垂直跃迁能和相应的振子强度 .研究表明 :2_TCVA(1)和 2_TCVA(2 )的强度最大的吸收波长分别为 2 4 9.72nm和 2 89.4 1nm ,2_TCVA(2 )的强度最大的吸收波长比 2_TCVA(1)的要长 .计算结果与实验结果符合得较好     

超高分子量PE凝胶膜的超拉伸性与旁式构象关系研究

通过ＩＲ方法，观测并讨论了在不同条件下制备的超高分子量ＰＥ（ＷＨＭＰＥ）凝胶膜中旁式（Ｇ构象）构象与超拉伸性的关系，提出了Ｇ构象浓度及分布对ＵＨＭＰＥ凝胶膜超拉伸性影响的新概念，同时也讨论了它与链缠结之间的联系，发现：反映Ｇ构象的相对浓度的比值σ＝Ｉ１３０３Ｉ１３５２随制膜浓度的增大而增加，在临界浓度Ｃ０（０．４～０．５ｇ＠１００ｍｌ）附近所形成的膜，具有超高拉伸性（λ＝２００），其Ｇ构象的变化与Ｍａｔｓｕｏ由比浓粘度提出的缠结链改变相对应；热处理温度比热处理时间对σ值的影响更显著，在一定温度下约４分钟后σ值基本不变；在σ值最低的温度范围拉伸，凝胶膜具有良好的超高拉伸性．     

Transfer Hydrogenation of C= C Double Bonds Catalyzed by Ruthenium Amido-Complexes: Scopes, Limitation and Enantioselectivity

The reduction of C = C double bonds is one of the most fundamental synthetic transformations and plays a key role in the manufacturing of a wide variety of bulk and fine chemicals. Hydrogenation of olefinic substrates can be achieved readily with molecular hydrogen in many cases, but transfer hydrogenation methods using suitable donor molecules such as formic acid or alcohols are receiving increasing attention as possible synthetic alternatives because it requires no special equipment and avoids the handling of potentially hazardous gaseous hydrogen.     

Highly Stereoselective Synthesis of trans-3-Aryl-4-carbethoxy-2,3-dihydro-2-fur-2＇-oyl-5-methylfurans

Multi-substituted dihydrofurans are valuable intermediates for the synthesis of natural products and pharmaceuticals. Considerable attention has been focused on the development of efficient and regioselective methods for their preparation. Using K2CO3 as a base, with the reaction of fur-2-oylmethyltriphenylarsonium bromide 1 and ethyl 2-acetyl-3-arylacrylate 2 in tetrahydrofuran at room temperature, we found an efficient protocol was achieved to synthesize trans-3-aryl-4-carbethoxy-2,3-dihydro-2-fur-2＇-oyl-5-methylfurans 3 in good yield with high stereoselectivity. The structure of compound 3 was confirmed by IR, ^1H NMR, MS and HRMS. The mechanism for the formation of 3 was proposed.     

Design of coordination polymer as stable catalytic systems

Here we report the first example of catalytic metallogels, which are formed irreversibly in dimethylsulfoxide via the creation of cross-linked, three-dimensional coordination polymer networks by using transition-metal ions with multiple sites available for coordination and multidentate ligands. Conformational flexibility of the ligands and slow formation of the coordination polymers apparently favor the gelation. These metallogels are stable in water and most organic solvents and can catalyze the oxidation of benzyl alcohol to benzaldehyde by using their PdII moieties as the catalytic centers. The best catalytic turnover of the metallogel is twice that of [Pd(OAc)2] under similar reaction conditions.     

化学发光磁酶免疫法检测O157∶H7大肠埃希菌

O157∶H7大肠埃希菌是一种致病力非常强的微生物.近年来,陆续有其引起食物中毒事件的报道.1996年日本发生O157∶H7大肠埃希菌食物中毒的爆发流行,感染病例逾万人,死亡9例.2001年我国江苏及安徽等地也发生了肠出血性O157∶H7大肠埃希菌所引发的感染性腹泻事件.目前O157∶H7大肠埃希菌实验室常规检测方法为分离培养计数法,此法费时费力,需要几天的时间才能得到检测结果[1,2],缺乏应对突发事件的能力,因此亟需开发快速检测技术.近年来,多种微生物快速检测技术如ELISA法[3]、热解质谱测定法[4]、多聚酶链反应[5]、荧光成像技术[6]、生物发…