Extraction of Lanthanides with Diamides of Dipicolinic Acid from Nitric Acid Solutions. I

Abstract

Three ortho-, meta-, and para-derivates of ethyl(tolyl)diamides of dipicolinic acid were synthesized and tested on their extraction performance from nitric acids solutions. Extraction of americium and lanthanides (Ln) by these compounds as a function of nitric acid concentration was studied. Distribution ratios of studied metals were determined using ICP-OES method and radiotracer ²⁴¹Am. Am/Ln separation differs among studied diamides, and the best separation was found for N,N′-diethyl-N,N′-di(ortho)tolyl-diamide.     

Adsorption of Endocrine Disruptors and Related Compounds Using Natural Polymer Composite Fibers Formed by Polyion Complexes

Endocrine disruptors are known as chemical compounds that affect living systems. The three investigated polyion complex (PIC) fibers are formed by the interaction of two kinds of oppositely charged polyelectrolytes in aqueous solution and examined for their adsorptive ability as endocrine disruptor adsorbents. Among nine compounds, seven endocrine disruptors and related compounds are adsorbed onto the PIC fibers. Particularly, benzo[a]pyrene is adsorbed in high amounts. The relationships between the structures of endocrine disruptors and the adsorption‐release behavior are investigated. Biphenyl exhibits mostly a repetitive adsorption‐release behavior.     

Synthesis and Structural and Initial Cancer Cell Line Characterization of Organotin Polyesters from Dipicolinic Acid

The interfacial polymerization is employed to produce high polymer poly(ester ethers) from the reaction of the salt of dipicolinic acid and various organotin dihalides. They are rapidly synthesized with yield increasing as the length of the organotin alkyl chain increases. Infrared spectroscopy shows the formation of new bands derived from the Sn–O and Sn–O(CO) linkages. IR also shows that the products exist as a combination of molecular geometries about the tin atom. MALDI MS shows formation of ion fragment clusters to five and six units in length. The products show good inhibition of a variety of cancer cell lines including two pancreatic cancer cell lines.     

油菜甾醇内酯及其类似物的合成研究进展

综述了油菜甾醇内酯类植物生长调节剂的结构与活性关系及近年来的化学合成方法。在分析油菜甾醇内酯类植物生长调节剂结构与活性关系的基础上,从母环的合成和侧链的引入两个方面详细介绍了该类化合物的合成关键及解决方法。     

Photocyclisation and Photocyclodehydrogenation of Stilbene and Related Compounds

The reversible photocyclisation of cis-stilbene analogues to the corresponding dihydrophenanthrenes is not slowed down at high viscosities of the medium. Its attenuation at low temperatures is a true temperature effect. Methylation affects the photocylisation significantly only if it results in strong steric interactions in the cyclisation product. Photocyclodehydrogenation of stilbenes with oxygen to the corresponding phenanthrene analogues passes through the 4a, 4b-dihydrophenanthrenes, and can be sensitized by various compounds at low concentrations. Photo-oxidation with iodine probably involves dehydrogenation of ground-state dihydrophenanthrene with atomic iodine. Electronically excited dihydrophenanthrenes may also be involved in the photo-oxidation.     

反相高效液相色谱法测定利福昔明有关物质

建立一种反相高效液相色谱法测定利福昔明有关物质.以ODS-C8为固定相,乙腈-甲醇-缓冲溶液为流动相,检测波长为240 nm,同时考察了方法的专属性.对有关物质的混合试样、降解试样和合格试样的测定结果表明,该方法专属性强,灵敏度高,简单准确,能有效检测利福昔明有关物质.     

吡虫啉相关化合物的合成及其杀虫效能

吡虫啉是吡啶类农药开发最成功的产品之一 ,但其中间体 2 氯 5 氯甲基吡啶的合成工艺较复杂。用 2 溴 5 噻吩基 甲基取代吡虫啉分子中的氯吡啶甲基 ,合成了 1 ( 2 溴 5 噻吩基 ) 甲基 2 硝基亚氨基咪唑烷 ,产率 54%。以萝卜蚜为测试虫进行的杀虫效果实验显示 ,LD50 ( 2 4h)为 6 3mg kg ,是一种合格的农药先导化合物 ,具有进行结构优化形成优秀农药的良好前景。     

Structure Studies on 6a-Thiathiophthenes and Related Compounds

The results from structure studies on 6a-thiathiophthenes show that different substituent groups perturb the bonding in the three-sulphur sequence to different degrees. Both equal and unequal S? S bonds occur in symmetrically as well as in unsymmetrically substituted derivatives. The specific effect of methyl and phenyl substituents on the sulphur-sulphur bonding may be described by the results from CNDO/2 calculations on mono-methyl and mono-phenyl substituted 6a-thiathiophthenes. Molecular packing and intermolecular close contacts also seem to affect the S? S bonding. The structures of equally substituted 6a-thiathiophthene analogues with and show, when compared with the equivalent 6a-thiathiophthene, that and cause a pronounced change in the S? S bonding, while the perturbation caused by is negligible. In symmetrical 6a-thiathiophthene analogues with and , the average bond length in the linear three-atom sequence is 9 – 12% longer than the respective single bond.     

Studies on Warburganal,Muzigadial and Related Compounds

Warburganal and muzigadial are two new sesquiterpenes isolated from a medicinal plant. They are two of the strongest antifeedants against the monophagous African army worm; in addition they possess potent molluscicidal activity and other antibiotic properties. A general account is given on these aspects as well as the spectral data leading to determination of their structures.     

杂环化合物席夫碱及其配合物的研究进展

概述了杂环化合物席夫碱及其配合物的研究现状,重点介绍了杂环化合物席夫碱及其配合物的合成方法及在生物医药领域中的应用,并对其发展趋势进行了展望。     

不饱和羧酸金属配合物的合成及性质研究进展

在大量文献调研的基础上,总结了结构多样的不饱和羧酸金属配合物的合成与性质,并对顺丁烯二酸的桥联一元过渡金属配合物、顺丁烯二酸的单杂芳环配体三元配合物、反丁烯二酸的桥联一元过渡金属配合物和反丁烯二酸的单杂芳环配体三元配合物的合成方法与配合物的晶体结构研究进展进行了较为详细的综述。     

2,4,6-Trinitropyridine and Related Compounds,synthesis and characterization

A detailed study of the formation of trinitropyridine-1-oxide from dinitroethanol led to the hitherto unknown 2,4,6-trinitropyridine. Thus, nitropyridines become accessible which cannot be obtained by direct nitration. The novel substances were characterized by analytical methods and their spectral data (UV, IR, NMR). First results from the research of their physical, thermical and explosive properties are presented.     

TiO2光催化氧化水中有机污染物进展

TiO2-水体系在紫外光照射下,在TiO2表面产生氧化能力很强的OH.自由基和超氧离子O2-,利用这一特性处理水中有机污染物得到很多环境工作者的密切关注.作者对TiO2光催化的影响因素、光电催化和太阳能利用等方面的研究与应用进展作了综合评述.     

High Catalytic Activity of Rosindone and Related Compounds in Alkaline Pulping

The efficacies of phenazine, phenazone and rosindone derivatives as additives in alkaline pulping were investigated and compared. Phenazones and rosindones are superior to the phenazines described earlier. Equimolar charges of rosindone sulfonate stabilize carbohydrates more than anthraquinone (v_M～l.l) but the de-lignification effect is slightly inferior (r_M = 0.72). Due to low solubility rosindone does not follow the square root relationship. Low rosindone charges (<0.1%) catalyze delignification as efficiently as anthraquinone (r_M ～1).

The half-wave potentials (pH Ik, 90°C, IN NaOH, SCE, in the presence of wood) were measured. No correlation is to be found between pulping efficacies (r_M-value) and redox potentials (Ey₂). The differences of the pulping efficacies are mainly explained in terms of chemical stability.     

Conjugated-polymer grafting on inorganic and organic substrates: A new trend in organic electronic materials

This review highlights recent developments in the grafting of conjugated polymers onto various substrates for organic electronic devices. The rapid development of multi-layer architectures demands the preparation of well-defined interfaces between both compatible and incompatible materials. It is promising therefore that interface-engineering is now known to help passivate charge trap states, control energy level alignments, enhance charge extraction, guide active-layer morphologies, and improve material compatibility, adhesion and device stability. In organic electronic devices, conjugated polymers are in contact with a wide range of constituents, such as metals, metal oxides, organic materials, and inorganic particles. Covalent bonds between these materials and macromolecules are desired to yield intimate contacts and well-defined interfaces. Following an overview of the various synthetic methodologies of conjugated polymers, the chemistry of tethering macromolecular chains onto nanoparticles and flat surfaces is described. The creation of functional hybrid materials offers the potential to deliver efficient and low-cost devices.