用卡尔曼滤波-分光光度法测定无机铬的形态

利用Ｋａｌｍａｎ滤波技术和二溴苯基荧光酮－溴化十六烷基三甲基铵－Ｃ_２Ｈ_５ＯＨ分光光度测定体系,同时对Ｃｒ（Ⅲ）和Ｃｒ（Ⅳ）进行测定。Ｃｒ（Ⅲ）的表观摩尔吸光系数为１．９６ × １０~５ Ｌ· ｍｏｌ~（－１）·ｃｍ~（－１）,线性范围为０～ ４．０ ｘ１０－６ｍｏｌ／Ｌ;Ｃｒ（Ⅵ）的表观摩尔吸光系数为４．１６ ×１０~５Ｌ· ｍｏｌ~（－１）· ｃｍ~（－１）,线性范围为０～５．２×１０~（－１）ｍｏｌ／Ｌ。     

碘酸钾存在下极谱催化波法测定陈皮甙

基于陈皮甙在ＫＩＯ３存在下产生的极谱催化波，拟定了测定陈皮甙的新方法。在 ０．５５ ｍｏｌ／Ｌ ＨＡｃ－０．０１ｍｏｌ／Ｌ　ＮａＡｃ（ｐＨ ４．００±０．０５）－１．０×１０～（－３）ｍｏｌ／Ｌ ＫＩＯ３缓冲溶液中，陈皮甙催化波的峰电位为－１．３５ Ｖ（ｖｓ，ＳＣＥ），它的一阶导数峰峰电流与陈皮甙浓度在２．６ × １０～（－７）～２．６ × １０～（－６）ｍｏｌ／Ｌ范围内呈线性关系（ｒ＝０．９９７０，ｎ＝６）。本方法比现有的电化学方法灵敏度高一个数量级。可用于直接测定中草药贯众水提液中陈皮甙含量。     

维生素K3亚硫酸氢钠的电化学研究

维生素Ｋ３亚硫酸氢钠在０．１ｍｏｌ／ＬＮａＣｌ＋０．０４ｍｏｌ／ＬＨＣｌ，ｐＨ＝１．８０底液中，于示波极谱仪上有一良好的二阶导数波，Ｅ″Ｐ＝－０．７４±０．０１Ｖ（ＳＣＥ），峰高与浓度在５×１０－９～１×１０－６ｍｏｌ／Ｌ以及１×１０－６～１×１０－５ｍｏｌ／Ｌ分段成线性关系，检测下限为１×１０－９ｍｏｌ／Ｌ，用于针剂含量的测定，结果良好。实验证明，当ｐＨ小于３．５９时，维生素Ｋ３亚硫酸氢钠逐渐转变为维生素Ｋ３亚硫酸，出现三个极谱峰，其中用于分析测定的峰为维生素Ｋ３亚硫酸１号位羰基的还原峰，其电极过程为扩散控制的可逆的双电子过程。     

哌仑西平的单扫描示波极谱法测定

本报道一种测定哌仑西平的单扫描示波极谱法，在０．１ｍｏｌ／ＬＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ（ｐＨ８．０±０．１）缓冲液中，哌仑西平有一极谱还原波，其峰电位为－１．５１Ｖ（ｖｓ．ＳＣＥ），其一阶导数峰高与哌仑西闰浓度在６．６×１０＾－７－４．６×１０＾－６ｍｏｌ／Ｌ（ｒ＝０．９９８１）和６．６×１０＾－６－１．６×１０＾－５ｍｏｌ／Ｌ（ｒ＝０．９９９１）范围内有线性关系，检测限为３．４×１０－７ｍｏｌ     

金属离子与卟啉的嵌入反应动力学研究──Ⅶ．一元酸根催化Cu（Ⅱ）与溴化间－四（N－乙酸甲酯基－3－吡啶基）卟啉的配位反应

研究了在３５±０．１℃、离子强度０．５ｍｏｌ／Ｌ（ＫＣｌ）条件下，甲酸根、乙酸根、丙酸根和丁酸根分别催化Ｃｕ（Ⅱ）离子与四溴化间－四（Ｎ－乙酸甲酯基－３－吡啶基）卟啉（Ｈ２ＴＢ－Ｎ－ＡＣＭＳｐｙＰＢｒ４）的反应动力学及其机理，该类反应对卟啉和Ｃｕ（Ⅱ）离子均为一级反应，反应动力学方程为：ｄ［Ｃｕｐ４＋］／ｄｔ＝ｋ｛（１．０＋ｂ［Ａ－］）／（１．０＋Ｋ３，４·［Ｈ＋］２）｝［Ｃｕ２＋］［ｐ］Ｔ，在甲酸－甲酸根缓冲体系中，ｋ＝２．９８ｍｏｌ－１ｄｍ３·ｓｅｃ－１，ｂ＝１５４×１０２ｍｏｌ－２，ｄｍ６·ｓｅｃ－１，Ｋ３，４＝６．９２８×１０３；在乙酸－乙酸根缓冲体系中，ｋ＝３．４２ｍｏｌ－１·ｄｍ３·ｓｅｃ－１，ｂ＝２．２９×１０３ｍｏｌ－２·ｄｍ６·ｓｅｃ－１，Ｋ３，４＝６．９２８×１０３；在丙酸－丙酸根缓冲体系中，ｋ＝３．００ｍｏｌ－１·ｄｍ３·ｓｅｃ－１，ｂ＝５．９０×１０２ｍｏｌ－２·ｄｍ６·ｓｅｃ－１，Ｋ３，４＝７．００７×１０３；在丁酸－丁酸根缓冲体系中，ｋ＝３．１４ｍｏｌ－１·ｄｍ３·ｓｅｃ－１，ｂ＝３．７５×１０２ｍｏｌ－２·ｄｍ６·ｓｅｃ－１，Ｋ３，４＝６．９２１×１０３；讨论了有机酸根的碱性与     

磷钼杂多酸-L-半胱氨酸自组装超分子膜电极对亚硝酸根电催化还原的研究

制备了磷钼杂多酸－Ｌ－半胱氨酸自组装超分子膜电极（Ｐ２Ｍｏ１８－Ｌ－Ｃｙｓ／Ａｕ）。采用水平衰减全反射（ＡＴＲ－ＦＴＩＲ）光谱表征了膜的组成。研究了该膜电极的电化学性质，发现它在１．０ ｍｏｌ／Ｌ　Ｈ２ＳＯ４溶液中，于０．０～０．７Ｖ（ｖｓ．ＳＣＥ）间ＣＶ扫描出现两对稳定、可逆的氧化还原峰，其中峰电位分别为Ｅｍ１＝０．３３４ Ｖ，Ｅｍ２＝０．１８８Ｖ，对应着Ｐ２Ｍｏ１８Ｏ_(６２)~(６－)的两步２电子－２质子反应；计时库仑法计算了薄膜内的电子传递系数Ｄ为５．０１ × １０~（－８）ｃｍ２·ｓ～（－１）。该膜电极对酸性溶液中的ＮＯ_２~－有明显的电催化还原作用，初步探讨了电催化机理。用差分脉冲伏安法（ＤＰＶ）测定其还原峰电流与ＮＯ_２~－的浓度在２．０ ×１０~（－６）～２．０ × １０~（－４）ｍｏｌ／Ｌ范围内呈良好的线性关系，相关系数为０．９９５３，检测限５．０×１０~（－７）ｍｏｌ／Ｌ。该电极用于模拟水样中ＮＯ_２~－的测定，结果满意。     

Mo（Ⅵ）－PAN与Mo（Ⅵ）－PAR体系的极谱性质对比研究

本文比较了Ｍｏ（Ⅵ）－１－（２－吡啶基偶氮）－２－萘酚（ＰＡＮ）与Ｍｏ（Ⅵ）－４（２－吡啶基偶氮）间苯二酚（ＰＡＲ）的极谱性质，讨论它们在作为吸附波试剂时的优缺点，以求得在选择络合剂时的感性和理性认识．本文还报道了Ｍｏ（Ⅵ）－ＰＡＮ－ＫＢｒＯ３吸附催化波体系，最佳实验条件，０．１ｍｏｌ／ＬＨＡｃ－－ＮａＡｃ，ｐＨ＝４．６，０．０１ｍｏｌ／ＬＫＢｒＯ３，２．５×１０－５ｍｏｌ／ＬＰＡＮ．峰电位为－０．７１Ｖ（ｖｓ．ＳＣＥ），检出限１×１０－９ｍｏｌ／Ｌ，线性范围０～６×１０－７ｍｏｌ／Ｌ     

钒－槲皮素－氯酸盐体系极谱催化波的研究

在醋酸盐缓冲底液中，钒能与槲皮素形成络合物，并吸附在汞电极上，在氯酸盐存在下，在Ⅴ（Ⅳ）还原至Ⅴ（Ⅲ）过程中，形成催化波。用单扫二阶导数极谱法测定时，钒浓度在１．０×１０￣（－９）～５．０×１０￣（－６）ｍｏｌ／Ｌ与峰高有正比关系，检出下限为５．０×１０￣（－１０）ｍｏ１／ｍＬ。测得电活性络合物的组成为Ⅴ（Ⅳ：Ｑｕ＝１：２。平行催化反应的速率常数Ｋ＝１．５×１０￣（４）（ｍｏｌ／Ｌ）￣（－１）ｓ（－１）。     

流动注射双安培法直接测定茶中单宁

基于不可逆电对的流动注射双安培检测原理，建立了快速检测茶叶中单宁的新方法。使用经阳极化处理的双铂电极，通过偶合单宁在一支电极上的催化氧化和氧化铂在另一支电极上的还原两个不可逆电极过程，在外加电位差为０Ｖ时，单宁的氧化电流与其浓度在１．０ × １０~（－６）～１．０ × １０~（－４）ｍｏｌ／Ｌ范围内呈线性关系，检出限为６．０ × １０~（－７）ｍｏｌ／Ｌ（Ｓ／Ｎ＝２）。连续４２次测定１．０ × １０~（－５）ｍｏｌ／Ｌ单宁，电流值ＲＳＤ＝１．２％。本法比现行国家标准方法简单、快速、灵敏，分别对市售绿茶、花茶、乌龙茶、红茶中单宁含量进行测定，结果令人满意。     

大量锆存在下铪镧钼杂多酸—耐尔蓝体系测定给

本文研究了耐尔蓝（ＮＢ）－给镧钼杂多酸（ＨｆＬａＭｏ－聚乙烯醇（ＰＶＡ）体系测定铪的超高灵敏光度法。在ＰＶＡ存在下，铪，镧和钼酸铵形成杂多酸，继而与耐尔蓝形成离子缔合物。其适宜条件为〔ＨＣｌｏ４〕＝１．２ｍｏｌ／Ｌ，〔Ｌａ×３＋〕＝２．９×１０＾－７ｍｏｌ／Ｌ，〔ＭｏＯ４×２－〕＝１．１×１０＾－３ｍｏｌ／Ｌ，〔ＮＢ〕＝２．７×１０＾－６ｍｏｌ／Ｌ，ＰＶＡ０．０８％。离子缔合物的最大吸收波长在５９     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.