EuI2—RbI二元体系相图

用差热分析和Ｘ射线粉末衍射法研究了ＥｕＩ２－ＲｂＩ二元体系相图。表明该体系是一个有４个化合物生成的复杂低共熔体系，其中ＲｂＥｕ２Ｉ５和ＲｂＥｕＩ３为固液同组成化合物，Ｒｂ３ＥｕＩ５和Ｒｂ４ＥｕＩ６为固液异组成化合物。初步确定Ｒｂ３ＥｕＩ５为立方晶系：ａ＝１．０１２４（１）ｎｍ；Ｒｂ４ＥｕＩ６为四方晶系：ａ＝１．３７１９（５）ｎｍ，Ｃ＝０．６４５８（５）ｎｍ．     

EuI_2－RbI二元体系相图

用差热分析和Ｘ射线粉末衍射法研究了ＥｕＩ２－ＲｂＩ二元体系相图。表明该体系是一个有４个化合物（ＲｂＥｕ２Ｉ５，ＲｂＥｕＩ３，Ｒｂ３ＥｕＩ５，Ｒｂ４ＥｕＩ６）生成的复杂低共熔体系，其中ＲｂＥｕ２Ｉ５和ＲｂＥｕＩ３为固液同组成化合物，Ｒｂ３ＥｕＩ５和Ｒｂ４ＥｕＩ６为固液异组成化合物。初步确定Ｒｂ３ＥｕＩ５为立方晶系：ａ＝１．０１２４（１）ｎｍ；Ｒｂ４ＥｕＩ６为四方晶系：ａ＝１．３７１９（５）ｎｍ，ｃ＝０．６４５８（５）ｎｍ。     

氯代亚乙烯基双噁唑的合成、晶体结构及其电子光谱

由氯代丁烯二酰氯和α－氨基苯乙酮的盐酸盐经缩合、关环反应合成了标题化合物Ⅰ、Ⅱ．用元素分析、紫外光谱、红外光谱、质谱鉴定了其结构，并用Ｘ射线衍射法测定了Ⅰ的晶体结构，其空间群为Ｐ２１，晶胞参数α＝０．８４５０（２）ｎｍ，ｂ＝０．６９９４（１）ｎｍ，ｃ＝１．５４３２（５）ｎｍ，β＝１０２．３８（２）°，Ｚ＝２．由于在烯键碳原子上引入体积较大的氯原子，使Ⅰ和Ⅱ分子的平面性变差，其电子光谱相对于反式－１，２－双［２－５－苯基唑基）］乙烯（ＰＯＥＯＰ）有蓝移，且荧光量子产率明显下降。     

（Ce0.67Tb0.33）MgAl11O19和BaMgAl10O17：Eu^2＋荧光体的微波辐 …

用微波辐射法合成了（Ｃｅ０．６７Ｔｂ０．３３）ＭｇＡｌ１１Ｏ１９（Ｐ－Ｇ）和ＢａｍｇＡｌ１０Ｏ１７（Ｐ－Ｂ）两种荧光体，经Ｘ射线粉末衍射分析，其ｄ值和Ｉ／Ｉ０值与ＪＣＰＤＦ３６－７３和２６－１６３基本一致。计算得到Ｐ－Ｇ的晶胞参数ａ＝０．５５８２ｎｍ，ｃ＝２．１８８４ｎｍ；Ｐ－Ｂ的晶胞参数ａ＝０．５６１６ｎｍ，ｃ＝２．２６１４ｎｍ，测定了两种荧光体的激发光谱和发射光谱，Ｐ－Ｇ的色坐标ｘ＝０．３１６     

Y2O2S：Eu^3＋荧光体的微波热效应合成和发光性能

用微波热效应法合成Ｙ２Ｏ３Ｓ：Ｅｕ＾３＋粉晶荧光体，经Ｘ射线粉末衍射分析确证其为六方晶系，计算得到其晶胞参数ａ＝０．３７８５ｎｍ，ｃ＝０．６５９０ｎｍ。激发光谱峰呈宽带状，最大激发光谱峰λｅｘ＝２６１ｎｍ，最大发射光谱峰λｅｎ＝６２６ｎｍ，其次还有５９５、６１７和７０６ｎｍ，归属为Ｅｕ＾３＋离子的＾５Ｄ０－＾７ＦＪ特征发射。     

一种高灵敏度的小檗碱高效液相色谱分析方法

根据在卤代烃类溶剂中的小檗碱在紫外线的激发下可产生强烈的荧光这一特性,采用正相色谱－荧光检测的方法建立了小檗碱的高灵敏度检测方法。色谱柱为ＬｉｃｈｒｏｓｏｒｂＳＩ６０（５μ）２０ｃｍ×４．０ｍｍｉ．ｄ．。流动相为二氯甲烷－甲醇－二乙胺－冰醋酸（９０：９：０．４：０．５）。荧光检测波长Ｅｘ＝３６５ｎｍ,Ｅｍ＝５１０ｎｍ。方法的检测限为０．２ｎｇ（Ｓ／Ｎ≥２．５）,在０．２ｎｇ～２０ｎｇ范围内具有良好的线性关系。     

二次锂电池正极材料LixNi0.3Co0.7O2的XPS与XRD研究

结果表明，ＬｉｘＮｉ０．３Ｃｏ０．７Ｏ２具有六方晶系Ｒ３＾－ｍ空间群结构。当Ｘ－１，０．３１５时，其晶胞参数分别为ａ＝２．８２６ｎｍ，ｃ＝１４．１３０ｎｍ和ａ＝０．２８０８ｎｍ，ｃ＝１．４２５３ｎｍ；ＭＯ６（Ｍ＝Ｎｉ，Ｃｏ）八面体中Ｍ－Ｏ平均距离分别为０。１９４１ｎｍ和０．１９３３ｎｍ。ＸＰＳ分析结果表明ＬＩｘＮｉ０．３ＣＯ０．７Ｏ２表面存在Ｌｉ２Ｏ，同时探讨了其中过渡金属离子的３ｄ电子结构变化。     

邻香兰素与邻氨基苯甲酸Schiff碱铜（Ⅱ）配合物的合成、晶体结构和热分解动力学

合成了邻香兰素（２－羟基－３－甲氧基苯甲醛）与邻氨基苯甲酸Ｓｃｈｉｆｆ碱铜（Ⅱ）配合物，测定了其晶体结构并研究了其热稳定性。晶体Ｃ_（３０）Ｈ_（２８）Ｃｕ_２Ｎ_２Ｏ_（１１）属正交晶系，空间群Ｐｃａｎ，晶胞参数：ａ＝１．０３４７（４）ｎｍ，ｂ＝１．５４９３（７）ｎｍ，ｃ＝１．７４４１（３）ｎｍ，Ｖ＝２．７９５９ｎｍ~３，Ｍ＝７１９．６４，Ｚ＝４。结构解析最终的一致性因子Ｒ＝０．０４７，Ｒｗ＝０．０４９，热分解反应动力学方程式为：ｄα／ｄｔ＝Ａ·ｅ~（－Ｅ／ＲＴ）·３（１－α）~（２／３）；其补偿效应数学表达式为：１ｎＡ＝０．２８５８Ｅ＋０．４０４５。     

二次锂电池正极材料Li_xNi_（0．3）Co_（0．7）O_2的XPS与XRD

结果表明，ＬｉｘＮｉ０．３Ｃｏ０．７Ｏ２具有六方晶系Ｒ３－ｍ空间群结构。当Ｘ＝１，０．３１５时，其晶胞参数分别为ａ＝２．８２６ｎｍ，ｃ＝１４．１３０ｎｍ和ａ＝０．２８０８ｎｍ，ｃ＝１．４２５３ｎｍ；ＭＯ６（Ｍ＝Ｎｉ，Ｃｏ）八面体中Ｍ－Ｏ平均距离分别为０．１９４１ｎｍ和０．１９３３ｎｍ。ＸＰＳ分析结果表明ＬＩｘＮｉ０．３ＣＯ０．７Ｏ２表面存在Ｌｉ２Ｏ，同时探讨了其中过渡金属离子的３ｄ电子结构变化。     

二溴羟基苯基荧光酮荧光熄灭法测定痕量铬（Ⅵ）

本文用荧光熄灭法研究了二溴羟基荧光酮－溴化二烷基甲铵体系的测定方法及条件。在ｐＨ＝２．４－３．４的盐酸介质中，在ＣＴＭＡＢ存在下，ＣｒⅥ）与ＤＢＨ－ＰＦ形成１：２的配合物。该体系存在两个激发峰，其激发波长分别为λｅｘ１＝４７０ｎｍ，λｅｘ２－５０２ｎｍ，发射波长 λｅｍ＝５２０ｎｍ。铬浓度在０．０４－０．４０μｇ／２５ ｍＬ范围内，△Ｆ与铬浓度呈现良好的线性关系，相关系数ｒ＝０．９９９２，检测限...     

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.     

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%).     

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.     

Synthesis of N-substituted carbazolones from α-iodo enaminones via Pd(0)-catalyzed intramolecular coupling under microwave irradiation

A variety of N-aryl and N-alkyl carbazolones were conveniently achieved in good to high yields via Pd₂(dba)₃-mediated intramolecular coupling of N-substituted α-iodo enaminones under microwave irradiation. The Pd(0)-catalyzed cyclization was found to proceed favorably with the more electron-deficient phenyl ring during the reactions involving unsymmetrical N,N-diaryl α-iodo enaminones. This unique property enables the construction of carbazolone skeleton containing nitro substituted benzenoid ring.     

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 substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles by intramolecular nitrilimine cycloaddition

Both substituted 2,4,5,6-tetrahydrocyclopenta[c]pyrazoles and 2,4,5,6-tetrahydropyrrolo[3,4-c]pyrazoles have been synthesized by the 3+2 intramolecular dipolar cycloaddition of nitrilimines to alkynes. This cyclization has been extended to more versatile 3-bromo derivatives by the use of alkynylbromides as dipolarophiles.