Schiff碱吡啶-4-甲醛缩氨基脲钴(Ⅱ)配合物的合成及其晶体结构

由Co(C lO4)2.6H2O和Sch iff碱吡啶-4-甲醛缩氨基脲反应合成了标题化合物[Co(H4FoPyS)2(H2O)4](C lO4)2.2H2O(1,H4FoPyS为Sch iff碱吡啶-4-甲醛缩氨基脲),其结构经IR,单晶X-射线衍射和元素分析表征。1属三斜晶系,空间群P,īa=6.9015(13),b=10.2030(19),c=11.136(2),α=104.960(3)°,β=90.090(3)°,γ=108.177(4),V=716.9(2)3,Dc=1.613 mg.m-3,Z=1,Mr=696.29,μ=0.868 mm-1和F(000)=359,最终偏差因子分别为R1=0.0857和wR2=0.2361。在1的晶体结构中,Co(Ⅱ)是六配位的稍变形八面体构型,其中2个吡啶氮原子和2个配位水分子占据赤道平面,另外2个配位水分子处于轴向位置。配合物分子通过氢键(N-H┈O和O-H┈O)相连,形成三维超分子网状结构。     

基于5-甲基-3-吡唑甲酸为配体的钴(Ⅱ)、镍(Ⅱ)配合物的合成、晶体结构和电化学性质

利用5-甲基-3-吡唑甲酸、咪唑和相应醋酸盐在乙醇和水混合溶剂中反应,得到了配合物[M(MPA)2(Im)2].2H2O(1:M=Co;2:M=Ni)(HMPA=5-甲基-3-吡唑甲酸,Im=咪唑)。用元素分析、红外光谱、X-单晶衍射结构分析、热重分析、循环伏安等对其进行了表征。配合物1和2的晶体结构参数如下:配合物1和2的晶体都属于单斜晶系,空间群为P21/n。配合物1的晶胞参数为a=0.847 02(16)nm,b=1.461 5(3)nm,c=0.899 67(17)nm,β=101.759(6)°,V=1.090 3(4)nm3,Z=2;配合物2的晶胞参数为a=0.853 59(6)nm,b=1.451 77(9)nm,c=0.889 83(6)nm,β=102.382 0(10)°,V=1.077 04(12)nm3,Z=2。金属离子与来自2个5-甲基-3-吡唑甲酸配体中的2个氮原子及2个氧原子,2个咪唑分子中的2个氮原子配位,形成八面体配位构型。配合物中的独立结构单元[M(MPA)2(Im)2].2H2O通过2种分子间氢键(N-H…O和C-H…O)形成三维超分子。循环伏安性质测试表明配合物1和2的电解过程均为准可逆过程。     

新型8-氨基喹啉锌配合物的合成及其荧光性能

以8-氨基喹啉,高氯酸锌和叠氮酸钠为原料,通过溶剂热反应合成了一种新型的单核配合物[Zn(8-aminoql)2(N3)]·Cl O4(1),其结构经FT-IR,元素分析和X-射线单晶衍射表征。1(CCDC:1 028 430)属单斜晶系,P2/c空间群,晶胞参数a=8.445 2(7),b=6.878 1(6),c=16.437 3(13),β=93.72(3)°,V=952.78(14)3,Z=2,Dc=1.726 g·cm-3,μ=1.474 mm-1,F(000)=504,R1=0.052 4,wR2=0.140 4[I2σ(I)]。中心Zn(II)为五配位构型,分别与五个N原子配位,其中4个N原子来自两个8-氨基喹啉配体,一个N原子来自N3-。1通过分子间弱的氢键(N-H┈O)和芳环间π…π堆积作用构成三维超分子结构。固体荧光性能测定结果表明:在355.0 nm波长激发下,1的最大发射波长位于516.4 nm。     

三维配合物Ni_2(BTEC)(H_2O)_4·2H_2O的合成及其晶体结构

以1,2,4,5-苯四甲酸(H4BTEC)为原料,用水热法合成了新的三维配合物Ni2(BTEC)(H2O)4·2H2O(1),其结构经IR,元素分析和X-射线单晶衍射表征.1属三斜晶系,P-1空间群,晶胞参数:a=0.691 5(3) nm, b=0.740 2(3) nm, c=1.554 2(7) nm, α=88.344(6)°, β=85.070(6)°, γ=86.594(6)°, V=0.790 9(6) nm3, Z=2, Mr=475.63 g·mol-1, Dc=1.997 g·cm-3, μ=2.457 mm-1, F(000)=484, R1=0.029 2, wR2=0.064 8, S=1.011. 1中Ni原子均处于倒反中心上,与BTEC4-配体的四个羧基上的4个O原子和两个配位水上的2个O原子配位,形成一个畸变的八面体几何构型.H4BTEC完全去质子化,并以μ6-配位方式桥联6个Ni原子,形成罕见的(4,6)-连接点的三维超分子结构,其拓扑类型为(44.62)2(44.610.8).     

基于2,5-二甲基苯-1,4-二亚甲基二膦酸的钴、镍同构化合物的水热合成及晶体结构(英文)

在水热条件下,利用2,5-二甲基苯-1,4-二亚甲基二膦酸(H4L)与CoCl2·6H2O或NiSO4·6H2O反应得到2个同构的过渡金属有机膦酸化合物,[Co(H2O)4(H2L)]n(1),[Ni(H2O)4(H2L)]n(2),并用元素分析、红外光谱、粉末及单晶X-射线等方法对其进行了表征。晶体结构分析表明:化合物1和2都属于三斜晶系,空间群为P1,化合物1的晶胞参数为a=0.497 0(2)nm,b=0.711 3(3)nm,c=1.177 8(5)nm,α=97.779(7)°,β=92.103(7)°,γ=107.217(6)°,V=0.3927(3)nm3,Z=2;化合物2的晶胞参数为a=0.494 35(19)nm,b=0.708 9(3)nm,c=1.172 6(5)nm,α=97.919(6)°,β=92.130(6)°,γ=107.441(5)°,V=0.387 0(3)nm3,Z=2。金属离子采取了八面体构型,6个配位氧原子分别来自2个反式构型的H2L配体和4个配位水分子。每1个金属离子与2个反式构型的H2L配体配位形成了一维线型链状结构。这2个化合物最终通过O-H…O氢键作用形成了三维结构。此外,对2个化合物的热稳定性也进行了研究。     

基于一种酰腙和咪唑配体的铜(Ⅱ)、镍(Ⅱ)配合物的水热合成、晶体结构及体外抗癌活性

采用水热法合成了5-硝基水杨醛缩噻吩-2-甲酰腙的铜和镍配合物[Cu(Him)L]2(1)和[Ni(Him)L](2)(H2L=5-硝基水杨醛缩噻吩-2-甲酰腙,Him=咪唑)并经元素分析、红外光谱和紫外光谱表征。X射线单晶衍射分析表明,1的晶体属单斜晶系,空间群P21/c,晶胞参数:a=1.135 68(12)nm,b=0.770 45(8)nm,c=2.140 4(2)nm,β=97.405(3)°。2的晶体属三斜晶系,空间群P1,晶胞参数:a=0.726 91(4)nm,b=0.976 34(6)nm,c=1.265 74(8)nm,α=79.533(2)°,β=82.862(2)°,γ=68.985(2)°。1是中心对称的双核配合物,Cu(Ⅱ)处于四方锥配位环境;2是单核配合物,Ni(Ⅱ)处于平面四边形的配位环境。化合物1通过N-H…O氢键形成一维超分子链,而化合物2通过N-H…O和C-H…O氢键形成二维超分子网络。初步研究了配体和配合物的体外抗癌活性。结果表明,配合物1和2对人肝癌细胞HEPG2和人结肠癌细胞SW620均有较强的增殖抑制作用。     

三维水网配合物[Ni(phen)_2(CO_3)]·7H_2O的水热合成、晶体结构及其电化学性质

用水热法合成了离子型配合物[Ni(phen)2(CO3)].7H2O(1,phen=1,10-邻菲啰啉),其结构经IR和元素分析表征。X-射线单晶衍射分析表明,1属单斜晶系,P21/c空间群,晶胞参数a=0.989 97(8)nm,b=2.637 60(2)nm,c=1.058 43(9)nm,β=105.917(2)°,V=2.657 8(4)nm3,Z=4,Dc=1.513 g.cm-3,F(000)=1 004,μ=0.795 mm-1,R1=0.050 1,wR2=0.110 4。相邻的1中结晶水和配位的碳酸根通过O-H┈O和C-O┈H构成三维超分子氢键网络。在水溶液中测试了1的电化学性质,循环伏安法表明1具有较好的电化学性质,存在一对氧化还原峰,其峰电位分别为0.31 V和-0.40 V。     

配合物Cu(pico)(4,4′-bipy)(H2O)ClO4·H2O的合成及其晶体结构

利用水热法合成了新型一维配合物Cu(pico)(4,4′-bipy)(H2O)ClO4·H2O(1,bipy=联吡啶,pico=邻吡啶甲酸根),其结构经IR,元素分析和X-射线单晶衍射表征.1属于单斜晶系,P21/n空间群,晶胞参数:a=0.853 57(8)nm,b=1.610 58(14)nm,c=1.416 85(13)nm,β=99.407(2)°,V=1.921 6(3)nm3,Z=4,Mr=477.31 g·mol-1,Dc=1.650 g·cm-3,μ=1.326mm-1,F(000)=972,R1=0.078 1,wR2=0.239 1,S=1.102.1中Cu2 与邻吡啶甲酸配体上一个N原子和一个O原子、两个4,4′-联吡啶的N原子以及一个水分子的O原子配位,形成了四方锥配位几何构型.在a c轴方向,Cu2 与两个4,4′-联吡啶分子经桥联作用形成一维zig-zag链;链与链通过氢键形成三维结构.     

镍(Ⅱ)/2,4,6-吡啶三酸配合物的合成和结构(英文)

采用水热方法合成了镍(Ⅱ)/2,4,6-吡啶三酸(H3L=2,4,6-pyridinetricarboxylic acid)的配合物(1);利用红外光谱和单晶X射线衍射表征了其晶体结构.配合物1属三斜晶系,P-1空间群,晶胞参数为:a=1.020 27(15)nm,b=1.112 93(17)nm,c=1.461 6(2)nm,α=75.026(3)°,β=78.291(2)°,γ=65.384(2)°,V=1.449 0(4)nm3,Z=2.配合物中的镍(Ⅱ)离子处于两种不同的配位环境.其中部分镍(Ⅱ)离子与配体中的两个羧基及氮原子配位,其余的镍(Ⅱ)离子与六个水分子配位;而配体吡啶环上的4-位羧基未与Ni(Ⅱ)离子配位.与此同时,配合物中形成复杂的氢键,通过氢键连接形成三维结构.     

新型2-(1,3-二噻烷-2-亚基)丙二酸Cd(Ⅱ)配合物的合成及晶体结构

合成了新型2-(1,3-二噻烷-2-亚基)丙二酸镉(Ⅱ)配合物[Cd(dyma)2(phen).H2O][dyma=2-(1,3-二噻烷-2-亚基)丙二酸,phen=1,10-菲啰啉],并通过元素分析和X-射线单晶衍射等手段对其进行了结构表征.结果表明:[Cd(dyma)2(phen).H2O]属于三斜晶系,空间群Pī;晶胞参数a=0.905 17(14)nm,b=1.221 94(19)nm,c=1.338 1(2)nm,α=69.761(2)°,β=72.313(2)°,γ=83.650(3)°,V=1.323 0(4)nm-3,Z=2,Dc=1.810 g.cm-3,μ=1.199 mm-1,F(000)=724,R1=0.037 5,wR2=0.085 7.中心Cd原子为七配位,分别与1,10-菲咯啉2个N原子、2个2-(1,3-二噻烷-2-亚基)丙二酸的羧基4个O原子和1个水分子配位.配位水分子与2个不同Cd(dyma)2(phen)分子中没有配位的羧基O原子形成分子间氢键,构筑成三维网状超分子配位聚合物.     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

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.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

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.