双臂套索冠醚双核铜（II）配合物的磁性质研究

测定了双臂套索冠醚双核铜（Ⅱ）配合物［Ｃｕ２Ｌ（ＯＨ）］（ＣｌＯ４）３Ｍｅ２ＣＯ（Ｌ－Ｎ，Ｎ＇－二（８－喹啉甲基）－１，４，１０，１３－四氧－７，１６－二氮环八环）的变温磁化率（４￣３００Ｋ），所加场强为５．０×１０＾５Ａ／ｍ，拟合了变温磁化率数据，得到Ｊ＝－２７９．４ｃｍ＾－２；加上分子场校正后，得Ｊ＝－２５７．７ｃｍ＾－１，Ｚｊ＇＝－３０．１ｃｍ＾－１。拟合结果表明，分子间存在反铁磁性交换作用     

铜（Ⅱ）锌（Ⅱ）—氟哌酸体系电化学行为及示波极谱法研究

铜（Ⅱ）和锌（Ⅱ）分别在０．１ｍｏｌ／ＬＫＨ２ＰＯ４－Ｎａ２ＨＰＯ４缓冲溶液（ｐＨ６．５）和０．２５ｍｏｌ／ＬＮＨ４Ｃｌ溶液中，与氟哌酸形成良好的络合吸附波，峰电位分别为－０．２６Ｖ和－１．２８Ｖ（ｖｓ．ＳＣＥ），络合比分别为１：３和１：２，峰电流与铜（Ⅱ）和锌（Ⅱ）的浓度均在４．０×１０＾－７～５．０×１０＾－６ｎｏｌ／Ｌ范围内呈线性关系，检测限分别为７．０×１０＾－８和５．０×１０＾－８ｍｏｌ     

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（Ｈ２Ｔβ－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［ＣｕＰ＾４＋］／ｄｔ＝ｋ｛１．０＋ｂ［Ａ＾－］）／（１．０＋Ｋ３，４．［Ｈ＾＋］＾２｝［Ｃｕ＾２＋］［Ｐ］Ｔ     

铜（Ⅱ）—4,7—二苯基—1,10—邻菲罗啉二磺酸根—聚吡咯H2O2传感器的研制

通过电化学方法将４，７－二苯基－１，１０－邻菲罗啉二磺酸黄盐（ＤＰＳ）的Ｃｕ（Ⅱ）络阴离子掺入聚吡咯（ＰＰｙ）薄膜内，制成ＰＰｙ／（ＤＰＳ）２ＣｕＨ２Ｏ２传感器，该传感器对Ｈ２Ｏ２的电还原过程有明显催化作用，催伦电流和Ｈ２Ｏ２浓度在５．０×１０＾－６～１．０×１０＾－３ｍｏｌ／Ｌ，范围内呈良好性关系，用于模拟样品中Ｈ２Ｏ２的测定。     

催化动力学光度法测定痕量苯酚

研究了在硫酸介质中苯酚对Ｉ＾－１催化Ｃｅ＾４＋－Ａｓ（Ⅲ）反应的抑制作用及其动力学条件。建立了用催化动力这光度法测定痕量苯酚的新方法，结果表明，在０．００１ｍｏｌ／ＬＣｅ（ＳＯ４）２，０．００１２５ｍｏｌ／Ｌ，Ａｓ２Ｏ３，０．０１ｍｇ／Ｌ，ＫＩ，０．０１２５ｍｏｌ／Ｌ，Ｈ２ＳＯ４和０．１３％（ｗ／ｖ）ＮａＣｌ溶液中测定苯酚，其表面摩尔吸光系数为２．１×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，线性范围     

新显色剂N—辛基—N‘—（氨基对苯磺酸钠）硫脲（OPT）与铜（Ⅱ）显色反应…

Ｎ－辛基－Ｎ’－（氨基对苯磺酸钠）硫脲是新合成的一种显色剂。该试剂极易溶于水而形成无色溶液，在ｐＨ３．６～５．２的ＨＡｃ－ＮａＡｃ缓冲体系中，试剂与铜（Ⅱ）形成一种稳定的蓝色水溶性配合物，其组成比为：Ｃｕ（Ⅱ）：ＯＰＴ＝１：３。配合物的最大吸收波长们于３０１．４ｎｍ，表观摩尔吸光系数ε３０１．４＝１．８２×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１。Ｃｕ（Ⅱ）在０～１０μｇ／２５ｍＬ服从比尔定律，相关系     

1，2－亚丙基双（草酰胺根）桥联的线性三核铜（Ⅱ）配合物的合成与磁性

本文合成和表征了四种新的三核铜（Ⅱ）配合物｛［Ｃｕ（Ｌ）］２［Ｃｕ（ＣＨ３－ｅｂｏ）］｝（ＣｌＯ４）２（ＣＨ３ｅｂｏ表示１，２－亚丙基双（草酰胺根），Ｌ表示１，１０－菲咯啉（ｐｈｅｎ）（１），５－硝基－１，１０－菲咯琳（ＮＯ２－ｐｈｅｍ）（２），２，２’－联吡啶（ｂｐｙ）（３）和４，４’－二甲基－２，２’－联吡啶（Ｍｅ２ｐｙ）（４））．测定了四种配合物的变温磁化率（７７－３００Ｋ），求得交换参数分别为Ｊ１＝－２１９．６ｃｍ－１，Ｊ２＝－１９１．７ｃｍ－１，Ｊ３＝－２００．８ｃｍ－１，Ｊ４＝－１８５．５ｃｍ－１，表明Ｃｕ（Ⅱ）－Ｃｕ（Ⅱ）离子间存在着强的反铁磁交换相互作用．     

具有不同类型桥基的双核Cu（Ⅱ）—Schiff碱配合物的合成 …

合成了３个分别以Ｃ２Ｏ＾２－４（「Ｃｕ２（Ｌ１）２（ｏｘ）」，１），ＡｃＯ＾－（「Ｃｕ２（ＡｃＯ）（Ｌ２）２」ＢＦ４，２）和酚氧（「Ｃｕ２９Ｌ３０２」（ＣｌＯ４）２，３）为桥基的双核铜配合物，并测定了１的复配合物「Ｃｕ２（Ｌ１）２（ｏｘ）」「Ｆｅ（ＯＨ）２（Ｈ２Ｏ）４」ＣｌＯ４．Ｈ２Ｏ及２和３的晶体结构。     

酸性镀铜体系的交流阻抗研究

研究了基础溶液（０．３ｍｏｌ／ＬＣｕＳＯ４＋１．９４ｍｏｌ／ＬＨ２ＳＯ４）以及添加６０ｍｇ／ＬＣｌ＾－，３００ｍｇ／ＬＯＰ－２１，３０ｍｇ／ＬＰＥＧ－６０００，１０ｍｇ／Ｌ２－噻唑啉基－二硫丙烷酸钠（代号ＴＤＹ，自合成添加剂）后体系的阻抗行为，结果表明：１）Ｃｌ＾－在铜沉积中有增大阴极极化的作用；２）铜离子的放电为分步反应；即Ｃｕ＾２＋→Ｃｕ＾＋；Ｃｕ＾＋→Ｃｕ（吸附）→Ｃｕ（晶格），在含有Ｃｌ＾     

Cu(Ⅱ)KIO_4胭脂红-1,10-菲罗啉体系催化动力学光度法测定人发中痕量铜

基于ｐＨ６．５ 的Ｎａ２ＨＰＯ４ＮａＨ２ＰＯ４ 缓冲介质中铜离子对高碘酸钾氧化胭脂红褪色反应的催化作用,提出了催化动力学光度法测定痕量铜的新方法。研究了该方法的适宜反应条件,方法的检出限为１．１×１０－ ７ｇ／ＬＣｕ（Ⅱ）,表观摩尔系数ε＝ ７．８×１０５Ｌ·ｍ ｏｌ－ １·ｃｍ － １,线性范围为０～０．５μｇ／１０ｍ ＬＣｕ（Ⅱ）,方法已用于人发中痕量铜的测定     

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.     

A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles

An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.     

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.     

Selective synthesis of 4,5-dihydroimidazo- and imidazo[1,5-a]quinoxalines via modified Pictet–Spengler reaction

An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction.     

Understanding the Diels-Alder reactivity of 1,2-azaborine analogues

The Diels-Alder reactivity of 1,2-heteroborines (H₄C₄B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed.