巴基管嵌锂电极性能的研究

用化学气相沉积法制备的巴基管作为锂离子电池的负极活性物质可以达到７００ｍＡｈ／ｇ的容量，远超过了石墨嵌锂化合物理论容量。ＣＶＤ巴基管电极经２０次充放电循环后，放电容量保持率为６５．３％，尽管ＣＶＤ巴基管电极初次充放电效率低，但经表面镀铜修饰后，初次充放电效率可提高到５５．９％。     

金属氢化物电极的化学活化

通过对Mm（NiMnCoAl）5电极的化学活化处理提高了金属氢化物电极的容量、电催化活性、活化性能和快速放电能力；讨论了化学活化处理对金属氢化物电极电化学性能的影响；在活化剂KBH4作用下，金属氢化物表面的氧化物技还原，在活化过程中一部分氢原子贮入合金之中，增加了电极的比表面，文中试验了这种活化方法对Ni／MH电池封口化成的作用，测试结果表明封口化成的AA型Ni-MH电池性能与开口化成电池的性能相当，其容量达到1050～1150mAh，1C、3C、SC信率下放电容量分别达到0．2C下的96．7％、89．0％、83．8％     

表面修饰对贮氢电极电化学性能的影响

表面修饰对贮氢电极电化学性能的影响蔡称心（南京大学化学系南京２１００９３）王宝忱（中国科学院长春应用化学研究所）关键词：贮氢电极，Ｎｉ／ＭＨ电池，表面修饰Ｎｉ／ＭＨ（ＭｅｔａｌＨｙｄｒｉｄｅ）二次电池由于在放电容量、干净度、重金属污染、耐过充过放电能...     

熔融碳酸盐燃料电池研究

以烧结Ｎｉ作电极，以ＬｉＡｌＯ２无机膜作电池隔膜，组装成了电极而积２８ｃｍ＾２的小型熔融碳酸盐燃料电池，试验了各种工作条件对电池性能的影响，电池经多次启动性能无衰减，放电电流密度１００ｍＡ／ｃｍ＾２，电池电压０．９５Ｖ，放电电流密度１２５ｍＡ／ｃｍ＾２，电池输出功率１１４ｍＷ／ｃｍ＾２，燃料气利用率８０％，电池能量效率３１％。     

α-PbO纳米粉体的固相合成及其对MnO2电极材料的改性作用

利用Pb(Ⅱ）盐与NaOH在室温下进行固相反应制备的纳米级α－PbO粉体（桔红色）,借助X射线衍射、透射电镜测试对合成的纳米粉体试样拨乱反正了表征,初步探讨了反庆机理,将合成的试样用于改性MnO2电极,1次深度放电测试结果表明,样品的掺杂量在1.25％－5.00%之间对MnO2有良好的改性效果,中等负荷放电时,纳米PbO改性的MnO2电极的放电容量比常粒径PbO改性的MnO2电极的放电容量高出20％以上,比纯国际1^#电解锰样（γ-MnO2）的放电容量平均高出约50％,在重负荷放电时,改性MnO2电极的放电容量提高幅度更大。     

脱氧核糖核酸变性和损伤的吸附伏安法研究

本文用汞电极（ＨＭＤＥ）二次导数阴极吸附伏安（ＳＤ－ＡｄＣＳＶ）和碳电极（ＧＣＥ、ＣＰＥ）导数循环伏安（ＦＤ－ＣＶ）法研究了核酸受热、紫外线、超声波和丝裂霉素Ｃ（ＭＭＣ）作用下的变性作用。在０．１ｍｏｌ／Ｌ（Ｋ２ＨＰＯ４＋ＫＨ２ＰＯ４）－０．１ｍｏｌ．Ｌ ＮａＣｌ（ｐＨ７．０）底液中，吸附的单股（ｓｓ－）和双螺旋（ｄｓ－）ＤＮＡ分别在ＨＭＤＥ上得到特征还原峰Ｐ３和Ｐ２，和在碳电极上得到氧化峰Ａ。物     

表面活性剂增敏阴极溶出伏安法测定痕量的碘

本介绍在ＫＮＯ３－ＶＣ－ＥＤＴＡ－Ｔｒｉｔｏｎ Ｘ－１００混合底液中，用悬汞电极２．５次微分阴极溶出伏安法测定痕量碘的方法及其最佳条件。引入表面活性剂Ｔｒｉｔｏｎ Ｘ－１００可显提高灵敏度，Ｉ＾－的检测下限达０．１ｎｇ·ｍＬ＾－１（电积１８０ｓ）；引入ＶＣ可提高Ｉ＾－的稳定性（抗氧化性）；ＥＤＴＡ和ＶＣ有效率地提高了方法的抗干扰能力。用于饮水中痕量碘的分析，其相对标准偏差为３．３％（ｎ＝７），     

聚苯胺全固态锂电池

用经γ射线辐照交联的ＰＥＯ作为固体电解质，研究了聚苯胺（ＰＡｎ）固态锂电他的电化学特性。实验发现通过γ－辐射交联后的ＰＥＯ电解质，室温电导率可达１０（－４）Ｓ／ｃｍ以上，并具有较好的机械强度。经过６８次的充放电循环实验、电池放电容量仍维持在６０ｍＡｈ／ｇＰＡｎ以上．该电池交流阻抗分析表明，界面Ｌｉ／ＰＥＯ的阻抗远大于界面ＰＥＯ／ＰＡｎ的阻抗．循坏伏安结果显示了聚苯胺具有良好的氧化还原可逆性．     

La1-xNdx(NiCoMnAl)5贮氢合金性能研究

研究了不同ｘ值的Ｌａ１－ｘＮｄｘ（ＮｉＣｏＭｎＡｌ）５合金的晶格常数、氢平衡压力、放电容量及大电流放电性能。测定结果表明，合金晶胞体积随ｘ值增加呈线性关系减小；当ｘ＝０２时，电极容量达到最大值，而氢平衡压力最低。     

紫外分光光度-CPA矩阵法同时测定2-(2′-呋喃基)苯并咪唑和邻苯二胺

研究了２－（２′－呋喃基）苯并咪唑（ＦＢＤ）和邻苯二胺（ＯＰＡ）在无水乙醇溶液中的紫外吸收光谱，建立了多波长同时测定ＦＢＤ和ＯＰＡ的紫外光度ＣＰＡ矩阵法。ＦＢＤ和ＯＰＡ分别在０．１～１０ｍｇ／Ｌ和１．０～１００ｍｇ／Ｌ的浓度范围，ＦＢＤ和ＯＰＡ的回收率均大于９３％，相对标准偏差小于７．５％。     

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.