5, 5’-二硫双（2-硝基苯甲酸）构筑的钴配合物的合成与晶体结构

以柔性配体5,5’-二硫双（2-硝基苯甲酸）为主配体,与含氮辅助配体在水热条件下合成了2个Co（Ⅱ）配合物{[Co（dtb）（bpp）·H₂O]}_n（1）,{[Co（dtb）（phen）·2H₂O]}_n（2）（H₂dtb=5,5’-二硫双（2-硝基苯甲酸）,phen=1,10-菲咯啉,bpp=1,3-二（4-吡啶）-丙烷）,通过X-射线单晶衍射、X-射线粉末衍射、红外光谱、热重分析和元素分析方法对其进行表征。结构测试表明1为正交晶系,Pbca空间群,晶胞参数为a=1.0149（2）nm,b=2.2159（5）nm,c=2.5291（6）nm,V=5.688（2）nm³,D_c=1.564g·cm^-3,Z=8。2为三斜晶系,P1空间群,晶胞参数为a=0.7401（3）nm,b=1.0742（4）nm,c=1.7837（6）nm,α=98.452（7）°,β=99.816（7）°,γ=98.979（7）°,V=1.3580（8）nm³,D_c=1.637g·cm^-3,Z=2。化合物1为三维网络结构,并包含单股双轴假螺旋结构。配合物2为一维链状结构,相邻一维链之间通过氢键作用形成二维超分子网络结构。     

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。     

二核双席夫碱铜(Ⅱ)配合物的合成、晶体结构及抗菌活性研究

合成了一对结构类似的双核铜配合物,[CuL¹]₂（1）和[CuL²]₂（2）,其中L¹是双席夫碱配体N,N’-二（5-氟水杨基）-1,3-丙二胺（H₂L¹）的二价阴离子,L²是N,N’-二（5-氟水杨基）-1,2-乙二胺（H₂L²）的二价阴离子,通过元素分析、红外光谱以及单晶X-射线衍射表征了它们的结构。配合物1以单斜晶系P2₁/c空间群结晶,其晶体学参数a=1.3488（1）nm,b=0.6814（1）nm,c=1.7087（1）nm,β=108.903（3）°,V=1.4857（2）nm³,Z=4,R₁=0.0480,wR₂=0.1141,Goof=1.115。配合物2以单斜晶系C2/c空间群结晶,其晶体学参数a=2.7568（2）nm,b=0.7036（1）nm,c=1.4547（1）nm,β=94.758（2）°,V=2.8118（5）nm³,Z=4,R₁=0.0472,wR₂=0.1139,Goof=1.094。X-射线分析表明2个化合物都是中心对称的双核配合物,其中Cu原子都是四方椎配位构型。通过MTT法研究了这2个配合物的抗细菌（枯草芽孢杆菌,金黄色葡萄球菌,大肠杆菌和荧光假单胞菌）和抗真菌（白假丝酵母菌和黑曲霉菌）活性。     

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。     

对位取代苯甲酸与2，2′-联吡啶配体构筑的两种二价铅配合物的合成、晶体结构及性质

水热条件下,合成了2个含对位取代苯甲酸和2,2′-联吡啶配体的二价铅配合物[Pb(4-HOBA)₂(2,2′-bipy)]·H₂O (4-HOBAH =4-hydroxybenzoic acid,2,2′-bipy=2,2′-bipyridine) (1)及[Pb(4-MBA)₂(2,2′-bipy)](4-MBAH=4-methylbenzoic acid) (2),并通过X-射线单晶结构分析、元素分析、红外光谱、紫外光谱、荧光光谱以及热重分析等手段对配合物进行了表征与研究。X-射线单晶结构测定表明,2种晶体的不对称单元中,六配位的二价铅离子分别与来自1个2,2′-联吡啶的2个N原子和2个对位取代苯甲酸的4个O原子螯合。配合物1属单斜晶系,P2₁/c空间群,a=1.094 83(4) nm,b=1.751 94(6) nm,c=1.204 79(4) nm,β=100.334(2)°,V=2.273 39(14) nm³,Z=4,final R₁=0.025 4,wR₂=0.067 4。广泛存在的分子间氢键和弱π…π堆积作用将配合物1组装成稳定的三维超分子结构。配合物2属三斜晶系,P1 空间群,a=0.955 10(11) nm,b=1.008 05(12) nm,c=1.324 83(15) nm, α=109.865(1)°,β=97.322(1)°,γ=90.643(1)°,V=1.187 8(2) nm³,Z=2,final R₁=0.028 4,wR₂=0.050 8。配合物2经由一对Pb…O(0.318 5(2) nm)弱相互作用被组装成二聚体结构,弱的Pb…O相互作用及与配合物1中类似的π…π堆积作用共同构筑了配合物2的三维结构。在配合物1和2中,铅的6s孤电子均显示了立体化学活性,使配位键分布于半球型区域。同时,两种配合物固体均具有光致发光特性,并在蓝光区有较强发射。     

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。     

以2,2’-联吡啶-4,4’-二甲酸和2-甲基吡嗪[3,2-f：2’,3’-h]喹喔啉为配体的三维锰（Ⅱ）配位聚合物的合成、晶体结构和荧光性质

采用水热法合成了一个锰的配合物[Mn（bpydc）（Medpq）]_n（1）（H₂bpydc=2,2’-联吡啶-4,4’-二甲酸,Medpq=2-甲基吡嗪[3,2-f：2’,3’-h]喹喔啉）,并利用元素分析、红外光谱、紫外可见光谱、热分析和X-射线单晶衍射对其结构进行了表征。单晶结构分析表明配合物1属于正交晶系,Cc空间群,晶胞参数a=2.0316（4）nm,b=1.5645（3）nm,c=0.71926（14）nm,β=103.97（3）,V=2.2185（8）nm³,Z=4。配合物1是一个锰(Ⅱ)离子经由bpydc^2-连接形成的三维网络结构。配合物1的固体荧光光谱表明它具有很强的荧光性。应用Gaussian03W程序,在HF/LANL2DZ水平上对标题化合物的自然键轨道（NBO）进行了分析,结果表明Mn(Ⅱ)与配位原子间的价键类型都属于共价键范畴。     

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。     

以3-硝基邻苯二甲酸根构建的环状双核Zn（Ⅱ）, Cd（Ⅱ）配合物的合成及晶体结构

以3-硝基邻苯二甲酸和咪唑及2,2’-联吡啶为配体构筑了2种配合物[Zn₂（npa）₂（Im）₄]（1）和[Cd₂（npa）₂（2,2’-bipy）₂（H₂O）₂]·2H₂O（2）（npa^2-=3-硝基邻苯二甲酸根,Im=咪唑,2,2’-bipy=2,2’-联吡啶）。用元素分析、红外光谱对其进行了表征,并用单晶X-射线衍射测定了配合物的晶体结构;测定了配合物1和2的热稳定性。2个配合物均为双核分子,具有M₂C₈O₄十四元大环结构。配合物1的双核单元通过分子间氢键形成3D网络结构,配合物2的双核单元通过分子间氢键和π-π堆积形成2D层状结构。     

两个具stp三维拓扑构型的稀土配位聚合物{[Ln2（pda）3（H2O）2]2H2O}n（Ln=Nd/La）

本文利用水热合成方法,将稀土氧化物与邻苯二乙酸（H₂pda）反应得到了2个新颖的稀土配位聚合物{[Ln₂（pda）₃（H₂O）₂]·2H₂O}_n（Ln=Nd（1）,La（2））。测定了它们的晶体结构,并进行了X-射线单晶衍射、红外光谱、荧光光谱和热重分析等性质的表征。晶体结构测定表明这2个化合物为异质同晶化合物。属单斜晶系,C2/c空间群。晶体学参数分别为配合物1：a=2.62906（18）nm,b=1.61172（11）nm,c=0.78327（5）nm,β=93.173（5）°,V=3.3139（4）nm³,Z=4,F（000）=1840,μ=3.173mm^-1,D_c=1.878g·cm^-3,R₁=0.0226,wR₂=0.0609;配合物2：a=2.6271（14）nm,b=1.6149（8）nm,c=0.7966（4）nm,β=92.850（9）,V=3.375（3）nm³,Z=4,F（000）=1816,μ=2.570mm^-1,D_c=1.823g·cm^-3,R₁=0.0466,wR₂=0.1416。化合物中邻苯二乙酸配体连接相邻的稀土金属离子,形成复杂的具有stp拓朴构型的三维网络结构。     

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.     

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.     

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.     

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%.     

Catalyst free,visible-light promoted photoaddition reactions between C60 and N-trimethylsilylmethyl-substituted tertiary amines for synthesis of aminomethyl-1,2-dihydrofullerenes

An efficient and benign method for the preparation of aminomethyl-substituted fullerenes has been developed. The process, involving catalyst free, visible-light irradiation of 10% EtOH-toluene solutions containing fullerene C₆₀ and N-trimethylsilylmethyl-substituted amines by using a 20 W compact fluorescent lamp, leads to formation of aminomethyl-substituted fullerene adducts in a highly efficient manner. The photoaddition reaction takes place via a pathway initiated by visible light absorption by C₆₀, followed by SET from the amine to the triplet excited state of C₆₀. Ethanol-promoted desilylation of the resulting a minimum radical then generates the corresponding α-amino radical which couples with the C₆₀ radical anion to form the anion precursor of the fullerene adducts. The new approach using visible-light takes place under mild conditions and it does not require the use of photocatalysts. Thus, the method developed in this effort could broadens the range of functionalized fullerene derivatives that can be readily prepared.     

Highly efficient and stereoselective cycloaddition of nitrones to indolyl- and pyrrolylacrylates

The reactions of various nitrones with indolyl- and pyrrolylacrylates proceeds regioselectively with high diastereoselectivity in the case of aldonitrones, and represents an effective method for obtaining new indolyl- and pyrrolyl-substituted isoxazolidine carboxylates stabilized by weak (CH?O) and moderate (NH?N) strength intramolecular hydrogen bonding. The resulting cycloadducts exhibit promising in vitro anti-influenza activities.     

Transition metal-free direct amination of benzoxazoles using formamides as nitrogen sources

A transition metal-free method for the direct amination of benzoxazoles using formamides as nitrogen sources is reported, which was mediated by an inexpensive and environmentally friendly tetrabutylammonium iodide/tert-butyl hydroperoxide system and gave the 2-aminobenzoxazole derivatives with moderate to good yields.     

l-Proline-catalyzed five-component domino reaction leading to multifunctionalized 1,2,3,4-tetrahydropyridines

Multifunctionalized 1,2,3,4-tetrahydropyridines are concisely synthesized in good yields via l-proline-catalyzed or l-proline/FeCl₃-cocatalyzed one-pot multicomponent reactions (MCRs). The MCRs involve a domino hydroamination/prins reaction/Mannich-type reaction/intramolecular dehydration-cyclization process. The molecular structure of 5baa, one of multifunctionalized 1,2,3,4-tetrahydropyridines, was confirmed by single-crystal X-ray diffraction.