两个基于二噻吩乙烯结构单元双核钌乙烯配合物的合成, 表征和性质

合成了2个含二噻吩乙烯结构单元双核钌乙烯配合物[RuCl（CO）（PMe₃）₃]₂（μ-2,2’-（CH=CH）^2-DTE）（1a）和[RuCl（CO）（PMe₃）₃]₂（μ-2,5-（CH=CH）₂-DTE）（1b）,利用元素分析、红外、核磁共振谱和电化学对它们的结构进行了表征,X-射线单晶衍射分析表明,配合物1a晶体属单斜晶系,C2/c空间群,晶胞参数为：a=3.44575（6）nm,b=1.45945（2）nm,c=2.32191（5）nm,β=110.9770（10）°,V=10.9028（3）nm³,Z=8,D_c=1.467g·cm^-3,λ=0.071073nm,μ（MoKα）=0.956mm^-1,F（000）=4912。测定了它们光照前后的紫外-可见吸收光谱变化图,并对其光致变色性质进行了讨论。     

单核Ru（Ⅲ）-edta类配合物的合成、结构及性质研究

采用K[Ru（Hedta）Cl]·1.5H₂O（edta为乙二胺四乙酸根）与含氮杂环配体5-（4-吡啶）四唑（4-ptz）或2,5-吡啶二甲酸（2,5-Pydc）反应,设计合成了2个单核[Ru（Hedta）（4-ptz）]·4H₂O（1）和[Ru（Hedta）（2,5-Pydc）]·3H₂O（2）配合物。晶体结构解析表明配合物1属于单斜晶系C2/c空间群,晶胞参数为a=2.348 06（15） nm,b=1.301 23（8） nm,c=14.930 8（9） nm,β=101.075 0（10）°;配合物2属于单斜晶系I2/a空间群,晶胞参数为a=3.249 4（7） nm,b=0.966 23（19） nm,c=1.434 1（3） nm,β=93.88（3）°。对2个配合物分别进行了IR及UV-Vis的表征,并通过电子吸收光谱和荧光淬灭光谱研究了配合物与DNA的作用,实验结果表明这2个钌配合物通过插入方式与DNA作用。     

两个含二齿席夫碱配体单核镍(Ⅱ)和铜(Ⅱ)配合物的合成、结构及抗菌活性

在溶剂热条件下合成了2种含HL（HL=（N-（3-甲基亚水杨基）吲哚乙胺）配体的金属配合物Ni（L）₂（1）和Cu（L）₂（2）,并通过热重分析、红外光谱、元素分析和单晶X射线衍射表征其结构。配合物1和2均属于单斜晶系,空间群为P2₁/n。配合物1的晶胞参数为a=1.481 6（7）nm,b=1.310 0（6）nm,c=1.668 7（7）nm,β=111.346（7）°,配合物2的晶胞参数为a=1.479 7（2）nm,b=1.299 41（19）nm,c=1.667 6（2）nm,β=111.537（3）°。配合物1和2具有类似的单核结构,通过分子内C-H…O氢键和分子间D-H…π氢键作用分别将其进一步延伸为三维超分子结构。而且,通过琼脂扩散法对配合物和配体的抗菌活性进行了细致的筛选,实验结果表明配合物1和2比配体具有更优异的抑菌效应。     

3,4-二甲基吡咯-2-甲酰肼缩PMBP的镧系(Ce、Pr、Nd)配合物的合成、结构及荧光性质

合成并通过单晶衍射表征了3个稀土配合物[LnL（NO₃）₃（H₂O）][LnL（NO₃）₃（CH₃CN）]·2CH₃CN（Ln=Ce （1）,Pr （2）,Nd （3）,L=3,4-二甲基吡咯-2-甲酰肼缩PMBP）。3个配合物同构,属于单斜晶系,P2₁/n空间群,晶胞参数分别为：1：a=1.758 83（9） nm,b= 1.460 61（8） nm,c=2.626 28（14） nm,β=97.800 0（10）°;2：a=1.756 39（15） nm,b=1.459 97（11） nm,c=2.623 1（2） nm,β=97.771（2）°;3：a=1.758 7（2） nm,b=1.463 87（17） nm,c=2.626 3（3） nm,β=97.760（2）°。每个配合物包含2个不同的中性配合物分子。配合物中每个十配位的Ln（Ⅲ）离子与来自酰腙配体L的2个氧原子和1个氮原子,3个双齿配位硝酸根及1个溶剂分子配位,采取双帽四方反棱柱配位构型。乙腈溶液中,配合物1~3具有与配体完全不同的荧光发射,可能由配位荧光增强效应导致。     

氨荒酸配合物（[M（MeBnNCS2）3], M=Sb（Ⅲ）, Bi（Ⅲ））的合成、晶体结构及抑菌活性

合成了2种新的N-甲基-N-苄基二硫代氨基甲酸锑[Sb（MeBnNCS₂）₃]（1）和铋[Bi（MeBnNCS₂）₃]（2）配合物。通过元素分析、红外光谱、¹H NMR、热重对其进行表征,并用X-射线单晶衍射测定了晶体结构。配合物1和2均属于单斜晶系,P2₁/c空间群。配合物1的晶胞参数为：a=0.9551（7）nm,b=1.3575（10）nm,c=2.4681（17）nm,β=104.01（2）°,Z=4,V=3.105（4）nm₃,D_c=1.520g·cm^-3,F（000）=1440,μ=1.314mm^-1,最终偏离因子R₁=0.0339,wR₂=0.0832,S=1.010;配合物2的晶胞参数为：a=1.3390（6）nm,b=0.9975（5）nm,c=2.4261（5）nm,β=98.433（7）°,Z=4,V=3.205（2）nm³,D_c=1.653g·cm^-3,F（000）=1568,μ=5.912mm^-1,最终偏离因子R₁=0.0398,wR₂=0.0864,S=1.089。在这2个配合物中,中心金属离子M（Ⅲ）与来自3个配体中的6个硫原子配位,配合物1形成6配位的畸变的八面体构型;配合物2则形成6配位的畸变的五角锥构型。在配合物2中,分子之间又通过Bi…S弱相互作用构成二聚体结构。利用琼脂扩散法测试了配合物的抑菌活性,结果表明配合物1对4种受试菌株具有较强的抑菌活性。     

2-乙酰基吡啶缩异烟酰腙镍(Ⅱ)和铜(Ⅱ)配合物的合成、晶体结构与性质

采用常规溶液法合成了2-乙酰基吡啶缩异烟酰腙镍配合物[NiL₂](1)和铜配合物[Cu(Ac)L](2),采用元素分析、红外光谱、紫外光谱、荧光光谱和热重分析以及X-射线单晶衍射分析进行了表征.结果表明,1的晶体属正交晶系,Aba₂空间群,晶胞参数a=1.2059(3)nm,b=2.0741(5)nm,c=0.9115(2)nm,V=2.2798(10)nm³,Z=4;中心离子Ni(Ⅱ)的配位数为6,它处于畸变八面体配位环境.2属单斜晶系,P2₁/c空间群,晶胞参数a=0.86477(13)nm,b=1.3383(2)nm,c=1.3631(2)nm,β=105.650(4)°,V=1.5190(4)nm³,Z=4;中心离子Cu(Ⅱ)的配位数为5,它处于畸变四方锥配位环境,吡啶基与金属配位的结果使配合物形成一种Z形配位聚合物.配合物有很高的热稳定性,分解温度分别为340℃(1)和296℃(2).2-乙酰基吡啶缩异烟酰腙没有发光性质,而配合物1和2均可发射紫色荧光     

基于2,5-噻吩二羧酸的稀土配合物的合成和表征

以2,5-噻吩二甲酸和稀土盐为原料,通过水热反应,合成了3个稀土金属配位聚合物{[La（OH）（SO₄）]}_n（1）,{[La₂（TDC）₂（SUC）]}_n（2）和{[Gd₂（TDC）₂（ox）（H₂O）₄]·2H₂O}_n（3）（H₂TDC=2,5-噻吩二甲酸,SUC=丁二酸,ox=草酸）,分别用X射线单晶衍射、元素分析、红外光谱对配合物2和3进行了表征。实验结果表明：配合物2和3均呈现三维网络结构,其中配合物2属于正交晶系,空间群为Pbca,a=1.372 8（4）nm,b=0.704 0（2）nm,c=2.136 2（6）nm,Z=8;配合物3属于单斜晶系,空间群为C2/c,a=1.934 3（4）nm,b=0.990 5（2）nm,c=1.252 8（3）nm,β=107.463（4）°,Z=4。     

两个基于2,2’-联吡啶-3,3’-二羧酸的稀土配合物的晶体结构和荧光性质

采用水热法合成了2个具有二维结构的吡啶羧酸类稀土配位聚合物{[Ln₂（bpdc）₃（H₂O）₂]·5H₂O}_n,（Ln=Nd（1）,Eu（2）,2,2’-Bipyridyl-3,3’-dicarboxylicacid）。单晶衍射分析显示1、2结构相似,均属于单斜晶系,P2/c空间群。1、2的晶胞参数分别为a=1.24100（19）nm,b=0.74835（59）nm,c=2.06050（20）nm,β=94.84（1）°;a=1.24100（19）nm,b=0.74301（20）nm,c=2.05250（30）nm,β=94.95（2）°。配合物是由之字形一维链构成的二维网络结构,其拓扑符号为{3^9;4^18;5}。热重测试结果表明1、2热稳定性较好。配合物2显示出很好的荧光性能。     

刚性1,4-二(4-甲基咪唑)苯配体构筑的两个d10配位聚合物的合成、结构及荧光性质

利用过渡金属镉（锌）盐与1,4-二（4-甲基咪唑）苯、间苯二甲酸分别采用分层和水热法合成了化合物{[Cd（BMIB）（H₂O）₂]（NO₃）₂}_n（1）和{[Zn₂（BMIB）_1.5（OH）（IP）_1.5]·H₂O}_n（2）（BMIB=1,4-二（4-甲基咪唑）苯,IP²-=间苯二甲酸根）,并对其进行了元素分析、IR及X射线衍射法表征。晶体结构研究表明：配合物1属于三斜晶系,P1空间群。晶胞参数：a=0.382 08（3）nm,b=0.904 72（7）nm,c=1.378 29（10）nm,α=98.581（4）°,β=97.020（3）°,γ=94.398（3）°。配合物2属于单斜晶系,C2/c空间群。晶胞参数：a=3.764 07（9）nm,b=1.017 18（5）nm,c=2.015 31（11）nm,β=120.860（2）°。配合物1是由配体BMIB连接镉离子形成一维链状结构,由氢键连接成二维层结构。而配合物2是由配体IP^2-连接锌离子形成一维梯状结构,该一维梯通过羟基和BMIB连接成三维网络结构。此外,配合物1和2具有较好的荧光性能。     

3,5-二氨基苯甲酸构筑的Zn（Ⅱ）、Cd（Ⅱ）两种配合物的合成及晶体结构

利用3,5-二氨基苯甲酸配体合成了2种新的配合物[Cd（diaba）（phen）₂]NO₃·H₂O（1）和[Zn（diaba）（2,2’-bipy）₂]（2）（H₂diaba=3,5-diaminobenzoicacid;phen=1,10-phenanthroline,2,2’-bipy=2,2’-bipyridine）,并对其进行了元素分析、红外光谱和X射线单晶衍射测定。配合物1属于正交晶系,空间群为Fddd,a=1.42581（7）nm,b=2.56462（13）nm,c=3.09247（17）nm。配合物2属于单斜晶系,空间群为C2/c,a=1.27362nm,b=1.59278nm,c=1.51935nm,β=107.334°。配合物1和2都为单核晶体。配合物1的结构单元由1个Cd^Ⅱ、1个3,5-二氨基苯甲酸和2个phen构成。配合物2的结构单元由1个Zn^Ⅱ、1个3,5-二氨基苯甲酸和2个2,2’-bipy构成。两种配合物再通过氢键或π-π堆积形成三维超分子网络。研究了配合物的热稳定性和荧光性质。     

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.     

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.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

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.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

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.