以有机溶剂热生长技术制备金属硫族化合物 [Mn(en)~3]PdSe~2及其晶体结构分 析

以有机溶剂热生长技术(solvothermaltechnique),即在180℃乙二胺(en)溶液中,以MnCl~3,PdCl~2,K~2Se在密闭容器中反应7d,制备出新的硫族化合物[Mn(en)~3]PdSe~2,其阴离子基团为[PdSe~2]^2^-,阳离子基团为过渡金属Mn与乙二胺(en)的配合物：[Mn(en)~3]^2^+。以单晶X射线衍射技术解得该晶体结构属正交晶系,空间群为Pbcn,[Mn(en)~3]PdSe~2(Ⅰ)的晶胞数据：a=1.1484(2),b=1.5057(3),c=0.93622(19)nm,Z=4。     

金属碲化物[Ga(en)~3]In~3Te~7晶体结构和性质的研究

以有机溶剂热生长技术(solvothermaltechnique),即在180℃乙二胺(en)溶液中,以GaCl~3,InCl~3,Rb~2Te和Te在密闭容器中反应7d,制备出新的硫族化合物[Ga(en)~3]In~3Te~7。其阴离子基团为Zintlanion:~∞^2[In~3Te~7]^3^-,阳离子基团为Ga与乙二胺(en)的配合物:[Ga(en)~3]^3^+。以单晶X射线衍射技术解得该晶体结构属单钭晶系,空间群为P2~1/c,(no.14),{Ga(en)~3]In~3Te~7的晶胞数据：a=1.0460(2)nm,b=1.6981(3)nm,c=1.4994(6)nm,α=90°,β=95.46(2)°,γ=90°,V=2.651(1)nm^3,Z=4。热分析结果表明,该化合物的热分解分三步进行。光学性质测试表明它们是半导体材料,禁带宽度为1.65eV。     

金属硫族化合物[Ni(en)3](Hen)SbSe4,[Sb(en)3]In3Te7的溶剂热生长及晶体结构

以溶剂热生长技术(Solvothermal technique)在180 C下以氯化物与具有氧化性的M 2Q(M=K,Rb;Q=Te,Se)反应,制备出新的硫族化合物[Ni(en)3](Hen)SbSe4(1),[Sb(en)3]In3Te7(2).化合物1的阳离子基团为过渡金属Ni与乙二胺(en)的配合物[Ni(en)3]2+及质子化的[Hen]+阳离子,阴离子基团为具有分立结构的[SbSe4]3-.化合物2的阳离子基团为[Sb(en)3]3+,阴离子基团为具有二维结构的2∞[In3Te7]3-.单晶X射线衍射结果表明,晶体1属三斜晶系,P1空间群,晶胞数据a=0.881 43(18)nm,b=0.962 35(19)nm,c=1.427 8(3)nm,α=104.74(3)°,β=92.47(3)°,γ=109.55(3)°,V=1.092 7(4)nm3,Z=2.晶体2属单斜晶系,P21/c空间群,晶胞数据:a=1.069 1(2)nm,b=1.693 2(3)nm,c=1.515 2(3)nm,α=90°,β=94.86(3)°,γ=90°.V=2.732 8(9)nm3,Z=4.     

有机杂化硫代碲酸盐化合物(H_2en)TeS_3和[Ni(en)_3]TeS_3的溶剂热合成与表征

用低温溶剂热法合成了2种分立结构的有机杂化硫代碲(Ⅳ)酸盐化合物(H2en)TeS3(1)和[Ni(en)3]TeS3(2)(en=乙二胺),通过X-射线单晶衍射,红外光谱,元素分析等手段对它们的结构进行了表征。晶体结构解析结果表明:2个化合物均属单斜晶系,空间群分别为P21和P21/c。化合物1和2具有孤立三角锥[TeS3]2-阴离子,化合物1的平衡阳离子为双质子化乙二胺[H2en]2+,阴离子基团[TeS3]2-和阳离子基团[H2en]2+之间通过N-H…S氢键连接。化合物2的阳离子基团为过渡金属Ni与乙二胺的配合物[Ni(en)3]2+。另外,对该2种晶体进行了紫外-可见漫反射光谱测试和热重分析。     

钴的二膦酸配合物[ Co(en) 3 ] [ Co2 (Hedbbp) 2 ]· 7H2O的合成与晶体结构

水热条件下合成了一个新的有机二膦酸钴配合物[Co(en)3][Co2(Hedbbp)2].7H2O,[H4edbbp=N,N’-二(苄基膦酸)乙二胺].X射线单晶衍射结构分析表明:配合物属三斜晶系,空间群P,ī晶胞参数:a=1.505.6(3)nm,b=1.524 8(3)nm,c=1.649 7(3)nm,α=63.10(3)°,β=78.12(3)°,γ=75.62(3)°,晶胞体积为V=3.252 4(11)nm3,Z=2.配合物结构单元中包含一个二膦酸钴的二聚单元阴离子[Co2(Hedbbp)2]2-和一个三乙二胺合钴螯合阳离子单元[Co(en)3]2 和七个水分子.     

三维氢键超分子稀土锑硒化合物[Tb(en)_4]SbSe_4·0.5en的溶剂热合成与晶体结构

<正>锑和锡等主族金属多元硫属化合物具有独特的物理和化学性质,这类化合物作为多功能材料,因其在半导体、光电导体、光致发光、非线性光学等方面的广泛应用而受到人们的关注[1,2]。自溶剂热法合成含钴的锑硫化物[Co(en)3]CoSb4S8以来[3],人们利用溶剂热技术,在乙二胺(en)水溶液中合成了一系列含过渡金属配离子的多元锑硫属化合物,如[M(en)3]Sb2S4(M=Co,Ni)、[M(en)3]Sb4S7(M=Fe,Ni)[4]、[Fe(en)3]2(Sb2 Se5)[5]、     

钴的二膦酸配合物[ Co(en) 3 ] [ Co2 (Hedbbp) 2 ]· 7H2O的合成与晶体结构

水热条件下合成了一个新的有机二膦酸钴配合物[Co(en)3][Co2(Hedbbp)2]·7H2O,[H4edbbp=N,N'-二(苄基膦酸)乙二胺].X射线单晶衍射结构分析表明配合物属三斜晶系,空间群P-1,晶胞参数a=1.505.6(3)nm,b=1.524 8(3)nm,c=1.649 7(3)nm,α=63.10(3)°,β=78.12(3)°,γ=75.62(3)°,晶胞 体积为V=3.2524(11)nm3,Z=2.配合物结构单元中包含一个二膦酸钴的二聚单元阴离子[Co2(Hedbbp)2]2-和一个三乙二胺合钴螯合阳离子单元[Co(en)3]2+和七个水分子.     

[Cu(en)_2]~(2+)修饰的二维仲钨酸化合物:[{Na_3(H_2O)_(10)}_2H_2{Cu(en)_2(H_2W_(12)O_(42))}]·16H_2O(英文)

利用水热合成法制备了一种基于[Cu(en)2]2+修饰的仲钨酸化合物:[{Na3(H2O)10}2H2{Cu(en)2(H2W12O42)}].16H2O(en=乙二胺)(1),借助元素分析、X射线单晶衍射分析I、R、UV、热分析和X射线光电子能谱对这种化合物进行了结构和性质研究.化合物(1)属于三斜晶系,P-1空间群.晶胞参数为:a=1.183 2(5)nm,b=1.296 0(6)nm,c=1.416 9(6)nm,α=63.348 0(10)°,β=82.844 0(10)°,γ=68.907 0(10)°,V=1.810 0(14)nm3,Z=1,R1[I2σ(I)]=0.024 7,wR2[I2σ(I)]=0.058 2.化合物(1)通过仲钨酸阴离子,铜离子和[Na3(H2O)10]3+三核簇形成了新型的二维层状结构.     

两个新的含铜杂多钨酸盐的合成、晶体结构和电化学行为

采用水热方法合成2个新的含铜杂多钨酸盐[Cu(en)2 (H2O)2][Cu(en)2]4[Cu(en)2 (H2O)]·[Cu4( H2O)2 (SiW9O34)2]·7H2O(en=乙二胺)(1)和[Cu(en)2(H2O)]2[Cu(en)2]4[CuSiW11O39]2·7H2O (2).化合物1是由过渡金属配...     

由Keggin型簇和过渡金属配合物构筑的杂多钨酸盐锯齿链的合成和结构（英文）

采用水热法合成了一维锯齿链状的有机-无机杂化杂多钨酸盐[Cu(en)2(H2O)]{[Cu(en)2(H2O)][Cu(en)2](α-SiW12O40)}(OH)2·H2O(记作1;en=1,2-乙二胺);利用元素分析、红外光谱和X射线单晶衍射对其结构进行了表征.结果表明,化合物1属于三斜晶系,P-1空间群;其晶格参数为:a=1.297 6(6)nm,b=1.473 5(7)nm,c=1.909 9(9)nm,α=86.736(8)°,β=88.833(8)°,γ=74.840(8)°,V=3.519(3)nm3,Z=2.就分子结构而言,化合物1由一个常见的Keggin型多阴离子[α-SiW12O40]4-、两个不同的铜配位阳离子[Cu(en)2(H2O)]2+和[Cu(en)2]2+、一个游离的铜配位阳离子[Cu(en)2(H2O)]2+、两个氢氧根离子和一个结晶水组成;相邻的[α-SiW12O40]4-多阴离子通过两个配位阳离子[Cu(en)2)]2+相连,形成一维锯齿链状结构.     

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.