环丙沙星-铜(Ⅱ)-TBZ/HPB配合物的合成、抗菌活性及与DNA作用

合成并表征了两个新的配合物：[Cu(HCP)(TBZ)](NO₃)₂·(H₂O)₂ (1)和[Cu(HCP)(HPB)](NO₃)₂·(H₂O)_1.5 (2)[HCP=环丙沙星,TBZ=2-(4′-噻唑基)苯并咪唑,HPB=2-(2-吡啶)-苯并咪唑]。配合物1属于三斜晶系,P1 空间群,a=0.909 5(2) nm,b=1.330 1(3) nm,c=1.355 2(3) nm,α=93.518(3)°,β=97.192(3)°,γ=106.361(3)°,V=1.552 6(6) nm³,Z=2,D_c=1.598 g·cm^-3,μ=0.849 mm^-1。用二倍稀释法研究了配合物的抗菌活性,发现配合物对大肠杆菌(Escherichia coli,G-)、沙门氏杆菌(Salmonella,G-)和枯草杆菌(Bacillus subtilis,G+)具有良好的抑制作用。应用电子吸收光谱、荧光光谱、粘度测定及凝胶电泳研究了配合物与DNA的作用,结果表明配合物以插入方式与DNA作用,在维生素C存在下通过·OH切割 pBR322 DNA双螺旋结构。     

基于1，2，4-苯三酸与[2，3-f]吡嗪并[1，10]菲咯啉配体的钴(Ⅱ)及镉(Ⅱ)配合物的水热合成与晶体结构

利用水热技术,合成了2个新的配合物{[Co(Hbtc)(Pyphen)(H₂O)]·H₂O}_n (1)和{[Cd₂(btc)(Pyphen)₂Cl]·2H₂O}_n(2) (H₃btc=1,2,4-苯三酸,Pyphen=[2,3-f]吡嗪并[1,10]-菲咯啉),并通过X-射线单晶衍射、元素分析、热重分析和荧光进行了表征。配合物1属三斜晶系,空间群P1,a=0.643 44(13) nm,b=1.202 9(2) nm,c=1.371 6(3) nm,α=95.03(3)°,β=90.46(3)°,γ=103.54(3)°,V=1.027 7(4) nm³,Z=2,CoC₂₃H₁₆N₄O₈,M_r=535.31,D_c=1.730 g·cm^-3,μ(MoKα)=0.900 mm^-1,F(000)=546,GOOF=1.089,R=0.099 2,wR=0.249 0;配合物2属三斜晶系,空间群P1,a=0.968 93(8) nm,b=1.223 82(10) nm,c=1.592 21(14) nm,α=67.486 0(10)°,β=73.158 0(10)°,γ=78.468 0(10)°,V=1.660 9(2) nm³,Z=2,Cd₂C₃₇H₂₃N₈O₈Cl,M_r=967.88,D_c=1.935 g·cm^-3,μ(MoKα)=1.432 mm^-1,F(000)=956,GOOF=1.051,R=0.077 9,wR=0.141 2。结构分析表明：配合物1为无限一维双链结构,配合物2为二维层状结构。此外,氢键和π-π相互作用在加固配合物的结构中起到重要作用。     

芳酰腙铜(Ⅱ)和锌(Ⅱ)配合物的合成、晶体结构及抗菌活性

合成了一对结构类似的双核铜和锌配合物,Cu₂(L¹)₂(1)和[Zn₂(L²)₂(CH₃OH)₂] (2),其中L¹和L²分别是2-溴-N''-(2-羟基-5-甲基苯亚甲基)苯甲酰肼(H₂L¹)和2-氯-N''-(2-羟基-5-甲基苯亚甲基)苯甲酰肼(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以三斜晶系P1空间群结晶,其晶体学参数:a=0.91411(6) nm,b=1.18004(7) nm,c=1.35936(9) nm,α=101.928(2)°,β=91.399(2)°,γ=107.873(2)°,V=1.3593(2) nm³,Z=2,R₁=0.0540,wR₂=0.1189,GOF=0.970。配合物2以单斜晶系P2₁/c空间群结晶,其晶体学参数:a=1.21697(9) nm,b=1.21496(9) nm,c=1.21283(9) nm,β=110.939(1)°,V=1.6748(2) nm³,Z=2,R₁=0.0341,wR₂=0.0689,GOF=1.024。X射线分析表明2个化合物都是中心对称的双核配合物,其中配合物1中的Cu原子是平面正方形配位构型,配合物2中的Zn原子是四方锥配位构型。还通过MTT法研究了这两个配合物的抗细菌(大肠杆菌,金黄色葡萄球菌,枯草芽孢杆菌和铜绿色假单胞菌)和抗真菌(白假丝酵母菌和黑曲霉菌)活性。     

柔性多羧酸配体锶配合物的合成、晶体结构及拓扑学分析

利用水热合成制备了一个新颖的基于柔性多羧酸配体的碱土金属配合物Sr(BuTA)_0.5(H₂O)₂(1)(H₄BuTA=1,2,3,4-丁四酸)。利用元素分析及X-射线单晶衍射对其进行了表征。结构分析结果表明标题化合物1属于单斜晶系,P2₁/c空间群,晶胞参数为a=0.870 03(5) nm,b=0.793 03(5) nm,c=1.268 07(5) nm,β=127.689(3)°,晶胞体积V=0.692 36(7) nm³,Z=4,D_calc=2.290 g·cm^-3,F(000)=468,μ=7.768 cm^-1,R=0.015 8,wR=0.037 7。在化合物1中,每个Sr(Ⅱ)的配位环境为八配位的反四棱柱配位构型。在配合物中金属和配体互相连接形成一个三维的框架结构,其拓扑为(4⁶)₂(4¹².6¹².8⁴)。在其结构中配体是少见的八连接点。对配合物1的热稳定性也做了测试。     

二维镉配位聚合物[Cd(nip)(bix)0.5H2O]n构筑的新型(3，5，5)连接的三维氢键超分子体系

在水热条件下合成了一个新颖的配位聚合物[Cd(nip)(bix)_0.5H₂O]_n (1) (nip=5-硝基间苯二甲酸,bix=1,4-(二亚甲基)二咪唑)。单晶X-射线衍射分析表明,晶体属三斜晶系,P1 空间群,晶胞参数a=0.827 1(2) nm,b=1.016 5(3) nm,c=1.147 4(3) nm,α=70.862(4)°,β=68.988(4)°,γ=69.001(4)°。V=0.818 4(4)nm³,Z=2,D_c=1.861g·cm^-3,μ=1.380 mm^-1,F(000)=454,最终的R₁=0.040 0,wR₂=0.090 1。配合物1中,nip^2-离子以μ₃桥联的方式连接Cd(Ⅱ)中心形成含有交替8元环和16元环的一维聚合链,进而,bix配体柱撑一维链形成了(3,4)-连接的二维配位网;最后,通过R²₂(6)氢键环的作用,二维网拓展为具有(3,5,5)-连接{3.4.5}{3.4².5.6⁴.7.8} {3.4³.5².6².7²}拓扑结构的三维超分子体系。此外,本文还研究了配合物1的热稳定性和荧光性质。     

三嗪吡唑类铜配合物的合成、结构及光谱研究

以三齿吡唑-三嗪(类蝎型)化合物2,4-二(3,5-二甲基吡唑)-6-二乙基胺-1,3,5-三嗪(bpz^*eaT)为配体,在无水乙醇和甲醇溶剂中,合成了2个配合物Cu₂(mpz^*eaT-EtO)₂(N₃)₂Cl₂(1)和Cu₂(mpz^*eaT-MeO)₂(N₃)₄(2)(mpz^*eaT-EtO：2-(3,5-二甲基吡唑)-4-乙醇-6-二乙基胺-1,3,5-三嗪;mpz^*eaT-MeO：2-(3,5-二甲基吡唑)-4-甲醇-6-二乙基胺-1,3,5-三嗪)。通过元素分析、红外光谱、紫外光谱、热重分析以及X-ray单晶衍射方法对配合物进行了表征,并分析了其光谱及结构特征。晶体结构表明,配合物1属于三斜晶系,P1空间群,a=0.9949(2)nm,b=1.0216(2)nm,c=1.1480(2)nm,α=115.11(3)°,β=106.99(3)°,γ=100.39(3)°,V=0.9460(3)nm³,Z=1;配合物2属于单斜晶系,P2₁/c空间群,a=1.5464(5)nm,b=1.4008(5)nm,c=0.8905(3)nm,β=103.227(5)°,V=1.8779(10)nm³,Z=2。配合物1和2中的中心铜原子均为五配位,形成扭曲的四角锥构型。     

3，4-二甲氧基苯乙酸邻菲咯啉轻稀土配合物的合成、晶体结构、荧光光谱及热行为

合成了3,4-二甲氧基苯乙酸邻菲咯啉轻稀土配合物：[RE₂(DMPA)₆(phen)₂](RE=Ce (1),Pr (2),Nd (3),Eu (4);HDMPA=3,4-二甲氧基苯乙酸,C₁₂H₁₂O₄;phen=1,10-邻菲咯啉),用元素分析、红外光谱、热重分析对产物进行表征,用单晶X-射线衍射方法测定了配合物3的晶体结构。配合物C₈₄H₈₂Nd₂N₄O₂₄ (3)属于三斜晶系,P1 空间群,晶胞参数：a=1.242 06(9) nm,b=1.244 56(9) nm,c=1.477 88(11) nm,α=90.617(4)°,β=103.486(4)°,γ=116.870(3)°,晶胞体积：V=1.963 8(2) nm³,晶胞内结构基元数Z=1,分子量M_r=1 820.02,电子数F(000)=926,密度D_c=1.539 g·cm^-3,吸收系数μ(Mo Kα)=1.389 mm^-1。测定了铕配合物的荧光光谱,荧光光谱表明,配合物显示了铕(Ⅲ)离子的特征发射,这表明配体将吸收的能量有效地转移给了中心离子,配体起到了很好的敏化作用。同时也测定了铕配合物的热分解情况,并利用TG-DTG曲线采用非等温积分法和微分法研究了热分解动力学机理。     

一个不常见的Ni(Ⅱ)的戊三酮二水杨酰腙配合物的合成和晶体结构

合成了镍的戊三酮二水杨酰腙配合物Ni(C₁₉H₁₆N₄O₅)的两个同质异晶,测定其晶体结构。该配合物的两个晶体均属单斜晶系,空间群为C2/c,晶体1晶胞参数为:a=1.03076(9)nm,b=1.9105(1)nm,c=0.93305(8)nm,β=101.490(4)°,Z=4,μ=1.119mm^-1,R=0.0370;晶体2晶胞参数为:a=2.1949(3)nm,b=0.9901(2)nm,c=0.8568(1)nm,β=92.799(6)°,Z=4,μ=1.084mm^-1,R=0.0440。两个晶体中镍原子由多啮配体的二个酰氧原子和二个肼氮原子形成平面正方形配位。对配合物的红外光谱进行归属。     

二维Cd(Ⅱ)配合物的晶体结构及其对对硝基苯酚、四环素、2,6-二氯-4-硝基苯胺的荧光识别

通过水热反应合成了一种 Cd(Ⅱ)配合物, 分子式为{(H₂dbim)_0.5[Cd(Hbptc)]·H₂O}_n (1), 其中 dbim=1-(4-(2, 6-二甲基-2H-苯并[d]咪唑-3(3H)-酰基)甲基)苄基)-2, 7-二氢-2, 5-二甲基-1H-苯并[d]咪唑, H₄bptc=3, 3'', 4, 4''-二苯甲酮四羧酸。配合物 1为 2D层状结构, 点符号为{4⁴·6⁶}。配合物 1可用于一些常见环境污染物的荧光识别。研究结果表明, 配合物 1能有效检测对硝基酚、四环素、2, 6-二氯-4-硝基苯胺。计算得到对硝基苯酚、四环素和 2, 6-二氯-4-硝基苯胺对 1的猝灭常数分别为 2×10²、5.4×10⁴和 2×10⁴ L·mol^-1。     

配位聚合物[Fe(HL)(H2O)]n的合成、晶体结构及磁性质

通过水热方法,采用H₃L(H₃L=2-(4-carboxypyridin-3-yl)terephthalic acid)与FeSO₄·7H₂O反应,合成了一个具有二维结构的配位聚合物[Fe(HL)(H₂O)]_n (1),并对其结构和磁性质进行了研究。结构分析结果表明该聚合物的晶体属于正交晶系,Pnna空间群,a=1.45465(11) nm,b=2.47423(15) nm,c=0.73565(4) nm,V=2.6477(3) nm³,D_c=1.802 g·cm^-3,Z=8,R=0.0468,wR=0.1256(I>2σ(I))。HL^2-配体交替连接相邻的铁(Ⅱ)离子形成了一维链结构单元,这些链又通过配体与铁(Ⅱ)离子的配位作用形成了二维层。最后这些层通过氢键作用形成了一个复杂的三维超分子框架。拓扑分析表明,配合物1具有一个双节4,4-连接的拓扑网络结构,其拓扑符号为(4³.6².8)。研究表明,该聚合物中相邻铁(Ⅱ)离子之间存在反铁磁相互作用。     

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%.     

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.     

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.     

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.     

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.