化学计量学在我国的发展

评述了化学计量学在我国近年来的发展,包括多元校正与分辨、稳健方法、化学模式识别、化学定量构效关系、分子模拟与优化、化学专家系统与库主要分支,其中特别对近年来得到飞速发展的新技术如高维数据解析方法,人工神经网络、小波变换给出了较详细的介绍。     

加拿大Humphreys教授在北京举行化学教学问题讲座(1985.10)

加拿大Mcmaster大学化学系教授、加拿大化学会教育委员会前主席D.D.Humphreys应邀在北京钢铁学院举行化学教学问题讲座。题目共十个;1.实验的意义;2.课堂演示实验的作用;3.如何教授百人的大班;4.培养解决问题技能的发展;5.不讲课的教学方式和方法;6.如何开设更好的课程;7.选择评定教     

耐热细菌

多数酶是不喜高温的。众所周知,发酵可以在室温下进行,需要能量很少。但是温度升高有利于加快化学反应速度。因此,人们一直在研究耐热微生物,亦即含有可以在较高温度下进行化学反应的酶的菌种。美国农业部北部研究中心(Northern Regional ResearchCenter of the U.S.Department of Agriculture)已经找     

N—N键合成方法的研究进展

N—N键广泛存在于药物、天然产物和有机功能材料中,如何高效构建N—N键是有机合成的一个重要研究方向.基于含氨基、氰基、硝基和叠氮基等含氮基团的有机化合物非常多,直接利用这些含氮基团进行N—N键偶联为合成含N—N键结构单元的有机化合物提供了新的策略.综述了近年来发展的分子间和分子内构建N—N键的合成方法,并且对该方法存在的难点以及未来发展方向进行了展望.     

Accelerated Hydrolysis of p-Nitrophenyl Picolinate Catalyzed by Metallomicelle Made from a Novel Macrocyclic Polyamine Copper（Ⅱ） Complex

A copper（Ⅱ） complex 1 of a novel macrocyclic polyamine ligand with hydroxylethyl pendant groups, 4,11-bis（hydroxylethyl）-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane （L） has been synthesized and characterized. Rate enhancement for hydrolysis of p-nitrophenyl picolinate （PNPP） catalyzed by 1 was studied kinetically under Brij35 micellar condition. For comparision, the catalytic activity of corresponding copper（Ⅱ） complex 2 of non-substituted macrocyclic polyamine ligand, 5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraaza-cyclotetradecane （L＇） toward the hydrolysis of PNPP was also investigated. The results indicate that the macrocyclic polyamine copper（Ⅱ） complex 1 effectively catalyzed the hydrolysis of PNPP, and the pendant ligand hydroxyl group or deprotonated pendant ligand hydroxyl group can act as catalytically active species in the reaction. A ternary Complex kinetic model involving metal ion, ligand and substrate has been proposed, and the results confirmed the reasonability of such kinetic model.     

Crystal Structure, Thermal Stability and Luminescence of Coordination Polymer [Cd（BBP）（p-PDOA）]n

Hydrothermal reaction of Cd（NO3）2·4H2O with bbp and p-PDOAH2 at 140 ℃ yielded a novel 1D cadmium（Ⅱ） coordination polymer, [Cd（bbp）（p-PDOA）]n （bbp=2,6-bis（benzimidazol-2-yl）pyridine, p-PDOA=p-phenylenedioxydiacetate dianion）, in which CdN3O4 pentagonal bipyramids were linked by p-PDOA ligands in a bis-bidentate mode to construct a zigzag chain with the adjacent Cd…Cd distance of 1.14（1） nm, There exists a 2D supramolecular network linked by π-π stacking with a face-to-face distance of 0.35（1） nm between the 2,6-bis（benzimidazol-2-yl） pyridine ligands and hydrogen-bonding interactions （0.27（4） nm）. A 3D supramolecular network was further constructed by these non-covalent interactions between the zippers. The TG/DTG showed that its chain skeleton was thermally stable up to 389 ℃ and the blue fluorescent emission of the complex was determined at 428 nm in a solid state with its long decay lifetime of 7.24 ns.