新型咔唑取代齐聚芴的合成及其性能

碘代芴中间体在碱性条件下与咔唑发生偶联反应,合成了两种新型的有机小分子发光材料2-咔唑-9,9-二丁基芴(CZF)与2,7-二咔唑-9,9-二丁基芴(DCZF),其结构经¹H NMR, ¹³C NMR和MS表征。采用FL, UV-Vis和TGA研究了CZF和DCZF的性能。结果表明：CZF和DCZF溶液与固体的荧光发射峰分别位于360 nm, 368 nm和370 nm, 389 nm, DCZF在390 nm和410 nm处存在两个较宽肩峰。CZF和DCZF的热稳定性较好,热分解温度分别为350 ℃和420 ℃。     

Weight distributions and weight hierarchies of a family of p-ary linear codes

Designs, Codes and Cryptography - The weight distribution and weight hierarchy of a linear code are two important research topics in coding theory. In this paper, by choosing proper defining sets...     

THE GAS TRANSPORT BEHAVIOR IN AROMATIC POLYESTER MEMBRANES

Six aromatic polyesters were prepared for gas separation membranes, and their per-meation properties for hydrogen, oxygen, nitrogen, carbon dioxide, and methane weremeasured at 30℃ and 1 atmosphere by low pressure manometric method. The cor-relation between the gas transport behavior and molecular structure of aromatic polyestermembrane is discussed. These data are interpreted qualitatively in terms of the calculatedpacking density, gas-polymer interaction, concentration of aryl bromine on backbone, andeffect of silane group on main chain of polymer.     

Synthesis and Structural Characterization of Mono-and Di-nuclear Zinc（ Ⅱ ） Coordination Compounds of Triphenylphosphoniopropionate

IntroductionThe coordination chemistry of zinc(Ⅱ)has beensubjected to extensive study in the past decades owingto its importance in life science[1].It has been foundthat zinc(Ⅱ)ions are crucially involved in the activesites of over300metalloenzymes and their role is notonly confined to catalysis and gene expression.Further-more,the presence of zinc(Ⅱ)helps to stabilize thetertiary and quaternary structures of proteins and nucle-ic acids[2—4].Like cadmium(Ⅱ),zinc(Ⅱ)is clearly amongthose m…     

单分散核／壳结构导电高分子复合材料的研究（Ⅰ）——单分散核／壳结构聚苯乙烯／聚吡咯的结构表征

导电高分子在光、电、磁等领域表现出的广泛应用前景 ,使它成为材料科学的研究热点 .然而 ,早期发现的导电高分子的不溶不熔性 ,使它在可加工性和机械性能等方面仍面临许多挑战 .核 /壳结构导电高分子与单分散技术的结合 ,无疑为这一领域的研究带来新的生机和活力 .目前仅有的少量文献主要集中报道微米和亚微米级单分散核 /壳导电高分子复合材料的研究 ,大多采用种子乳液聚合法合成 .微米级的种子乳液通常采用以醇为分散介质的分散聚合方法制备 [1～ 3] ,由于种子分散体系要经反复离心分离 ,除去醇类 ,重新分散在水相中再进行核 /壳导电高分…     

新颖孤立的金属环组装而成的三维氢键超分子化合物的合成及晶体结构

A novel discrete dinuclear metaUacyclic copper（Ⅱ） complex, [Cu2L2（H2O）2]·3H2O （1） has been firstly prepared where L is derived from the 1 ; 2 condensation of 2,2＇-bipyridyl-3,3＇-diformylhydrazide and acetone during the formation of the complex. Single-crystal X-ray diffraction analysis determines that the complex consists of dinuclear metallacyclic units [Cu2L2（H2O）2] where two metal centers are linked together through two bis（chelating） bridge ligands L to form a bizarre cavity with size 0.9417 nm× 0.4999 nm× 0.6930 nm. Interestingly, the metal coordination also creates hydrogen bond sites that further aggregate these metallacycles into a 3D supramolecular structure with 2D perpendicular hydrophilic tunnels in crystal.     

A New Phenylpropanoid Glycoside: Serratumoside A from Clerodendrum serratum

In the previous papers"', we have reported some chemical constituents fromClerodendrum serratum var. amplerghlium Moldenke. A continuation of our studies onthe same plant led to the isolation of a new phenylpropanoid, serratumoside A (l), whichis reported in this paper.Serratumoside A (l) with three known phenylpropanoid glycosides identified asacteoside', mwtinoside' and myricoside', respectively, were isolated from the Cserratum. Compound I was isolated as a brown amorphous powder, laly …     

锌掺杂碳量子点“关-开”型荧光探针检测果蔬中谷胱甘肽的研究

以柠檬酸、乙二胺和乙酸锌为前体,采用一步水热法制备了一种稳定的、高荧光量子产率的水溶性锌掺杂碳量子点(Zn-CQDs)。通过透射电子显微镜(TEM)、X射线衍射(XRD)、傅立叶红外光谱(FTIR)、紫外-可见吸收光谱(UV-Vis)、荧光光谱对Zn-CQDs的结构和光学性能进行了表征。研究表明,Cu~(2+)对Zn-CQDs的荧光产生猝灭,体系的荧光信号处于"关闭"状态,还原型谷胱甘肽(GSH)的存在,使Zn-CQDs-Cu~(2+)体系的荧光得以恢复,体系的荧光信号处于"打开"状态。由此构建了"关-开"型荧光探针用于谷胱甘肽(GSH)的选择性、高灵敏检测。探究了反应p H值和反应时间对荧光恢复体系的影响,同时考察了果蔬中常见的有机小分子和离子对Zn-CQDs-Cu~(2+)体系荧光强度的影响,在最佳实验条件下,GSH浓度在0. 05～80μmol/L内与Zn-CQDs荧光恢复率呈线性关系,检出限达63 nmol/L。将该探针用于果蔬中GSH的检测,样品的加标回收率为98. 6%～101%,相对标准偏差为1. 8%～3. 1%,结果令人满意。     

氨基酸改性聚乳酸

为了改善聚乳酸降解速度慢、细胞亲和性差等方面的不足,氨基酸对聚乳酸的改性工作正在得到人们越来越多的关注.本文综述了氨基酸对聚乳酸改性的各种方法,以及各种氨基酸改性聚乳酸材料的性能与应用.其中,较为常见的改性方法是合成聚(乳酸-氨基酸).展望氨基酸改性聚乳酸类生物降解材料的未来,降低合成成本是广泛应用的关键.因此,虽然目前广泛应用的聚(乳酸-氨基酸)合成途径是氨基酸环状衍生物(尤其是吗啉-2,5-二酮)开环聚合法,但经济有效地以氨基酸、乳酸等为原料的直接聚合法值得关注.     

Effect of Cationic Surfactant on the Gelation of HPAM by Cr(III)

Aqueous gels formed by the crosslinkage of Cr(III) with partially hydrolyzed polyacrylamide (HPAM), have been commonly applied in the field of petroleum production1. Polymer and surfactants are used in enhancement of oil recovery2. Some studies3 indicate that a strong interaction is existent between polyeletrolytes and oppositely charged surfactants. So it is very important to study the effect of cationic surfactants on the gelation process of crosslinkage of Cr(III) with HPAM. To o…