两个4-[(8-羟基-5-喹啉)偶氮]苯磺酸配合物的合成、结构及性质研究

以4-[(8-羟基-5-喹啉)偶氮]苯磺酸(H₂L)为配体,采用溶剂热合成法合成了两个配合物[CuL(en)]·0.5H₂O (1)和[CuL₂][Cu(en)₂]·2H₂O (2)(en=乙二胺),并采用单晶X-射线衍射、红外光谱、元素分析、X-射线粉末衍射和热重分析对其进行表征。化合物1和2通过氢键和π…π相互作用连接形成了三维超分子网格。此外,还研究了两个化合物的荧光性质。     

4-(3H)-喹唑酮Co(Ⅱ)、Ag(Ⅰ)配合物的合成、晶体结构、荧光和抗癌活性

以4(3H)-喹唑酮、Co(NO₃)₂·6H₂O、AgNO₃为原料,在相同物料比、溶剂和常温条件下,合成了配合物[Co(L)₂·(H₂O)₂·(NO₃)₂] (1)和[Ag(L)₂·(NO₃)] (2)(L=4-(3H)-喹唑酮).对其进行了X-射线单晶衍射表征和热重分析.X-射线单晶衍射分析表明,它们都属于三斜晶系,但1是六配位,2是三配位的.还测定了2的固体荧光和抗癌活性.配合物2的最大发射波长比配体红移了27 nm,其对NCI(人非小细胞肺癌细胞)有较好的抗癌作用.     

基于2-苯基-1H-1，3，7，8-四-氮杂环戊二烯并[l]菲的Pb（Ⅱ）、Co（Ⅱ）配合物的晶体结构与发光

采用水热法合成2种配合物[Pb₂（ptcp）₂（DDA）]（NO₃）₂·2H₂O（1）和[Co（ptcp）₂（DDA）（H₂O）]·0.5H₂DDA·H₂O（2）（ptcp=2-苯基-1H-1,3,7,8-四-氮杂环戊二烯并[l]菲,H₂DDA=1,12-十二烷二酸）,并采用单晶X-射线衍射、元素分析、红外光谱、X-射线粉末衍射和理论计算对其进行了结构表征。配合物1和2分别呈现双核和单核结构,通过π-π和氢键作用形成二维和三维结构。此外,配合物1具有较好的发光性质。利用Gaussian09W程序,采用B3LYP/LANL2DZ方法对配合物1进行自然键轨道（NBO）分析。结果表明配位原子与Pb（Ⅱ）离子之间存在明显的共价相互作用。     

两个基于羧基-水分子链构筑的超分子镉配合物的合成、晶体结构和荧光性质

以5甲基-3-吡唑甲酸(H₂MPCA)为主配体,在螯合配体菲咯啉(phen)或2,2'-联吡啶(2,2'-bpy)的存在条件下,与醋酸镉在常温下反应得到2个基于氢键构筑的羧基-水分子链的超分子化合物,[Cd(HMPCA)₂(2,2'-bpy)]·2H₂O(1)和[Cd(HMPCA)₂(phen)]·2.5H₂O(2),并通过元素分析、红外光谱、热重分析、X-射线衍射等对其结构进行了表征.结构分析表明,在化合物1和2中,单核镉的配合物和游离水分子通过氢键及π…π堆积作用形成了三维超分子结构,在此过程中,游离水和羧基构筑的链状水分子簇起着非常重要的作用.此外,我们还研究了化合物1和2的热重和荧光性质.     

咪唑-芳香多羧酸金属有机骨架化合物的合成、结构及性质

以5-(1H-咪唑)异酞酸(H₂L)为配体,在水热条件下合成了3个金属有机框架化合物:[PrL(HL)(H₂O)₂]·H₂O(1),Er(H_0.5L)₂(2)和[CoL(H₂O)₂]·H₂O(3)。单晶X-射线衍射测试结果表明,3个化合物都属于单斜晶系,P2₁/c空间群。化合物1中,Pr³⁺为九配位,而化合物2和3中,Er³⁺和Co²⁺均为六配位。在镧系配合物1和2中,配体中氮原子未参与配位。1为2D折叠形结构,2为3D框架结构。在过渡金属配合物3中,氮原子与Co²⁺配位,这有助于形成平面二维结构。化合物1和3通过分子间π-π堆积,进一步形成3D结构。3个化合物均展现出较好的热稳定性。     

基于5-(4-(2,6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸的Mn(Ⅱ)和Ca(Ⅱ)配位聚合物的合成与晶体结构

采用对苯二甲酸为模板剂, 溶剂热法合成了2个以5-(4-(2, 6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸(H₂L)为配体的金属-有机配位聚合物:{[MnL] ·0.5H₂O}_n (1), {[CaL(H₂O)₂]·H₂O}_n (2)。通过X-射线单晶衍射, 元素分析和红外光谱进行了结构表征。结构分析表明, 1具有(3, 3)-连接的不同手性型二维层面结构, 这些交替出现的单手性左旋型和右旋型二维平面通过配体的吡啶环与吡嗪环间π…π堆积作用构成了三维超分子结构;2是通过L^2-配体羧基桥连接相邻的Ca(Ⅱ)金属中心, 形成一条平行于b轴方向的一维链结构。研究了配位聚合物的热稳定性和2的荧光性质。     

基于5-(4-(2,6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸的Mn(Ⅱ)和Ca(Ⅱ)配位聚合物的合成与晶体结构

采用对苯二甲酸为模板剂,溶剂热法合成了2个以5-(4-(2,6-二(2-吡嗪基)-4-吡啶基)苯氧基)间苯二甲酸(H₂L)为配体的金属-有机配位聚合物：{[MnL] ·0.5H₂O}_n (1),{[CaL(H₂O)₂]·H₂O}_n (2)。通过X-射线单晶衍射,元素分析和红外光谱进行了结构表征。结构分析表明,1具有(3,3)-连接的不同手性型二维层面结构,这些交替出现的单手性左旋型和右旋型二维平面通过配体的吡啶环与吡嗪环间π…π堆积作用构成了三维超分子结构;2是通过L^2-配体羧基桥连接相邻的Ca(Ⅱ)金属中心,形成一条平行于b轴方向的一维链结构。研究了配位聚合物的热稳定性和2的荧光性质。     

咪唑-芳香多羧酸金属有机骨架化合物的合成、结构及性质

以5-(1H-咪唑)异酞酸(H₂L)为配体,在水热条件下合成了3个金属有机框架化合物:[PrL(HL)(H₂O)2]·H₂O (1),Er(H_0.5L)₂ (2)和[CoL(H₂O)2]·H₂O (3)。单晶X-射线衍射测试结果表明,3个化合物都属于单斜晶系,P2₁/c空间群。化合物1中,Pr³⁺为九配位,而化合物2和3中,Er³⁺和Co²⁺均为六配位。在镧系配合物1和2中,配体中氮原子未参与配位。1为2D折叠形结构,2为3D框架结构。在过渡金属配合物3中,氮原子与Co²⁺配位,这有助于形成平面二维结构。化合物1和3通过分子间π-π堆积,进一步形成3D结构。3个化合物均展现出较好的热稳定性。     

基于三联吡啶-4-羧酸的系列配合物的结构多样性和发光性质

在溶剂热条件下制备了系列新配合物：[Cr₂(tpc)₂(HCOO)₂(OH)₂] ·4H₂O (1)、[Ba(tpc)₂(H₂O)₂]_n (2)、[Zn₂(tpc)₂(NO₃)₂]_n (3)、[Pb(Htpc)(NO₃)₂]·2H₂O (₄)和[Rh(Htpc)Cl₃]·CH₃OH·H₂O (5)(Htpc=2,2''∶6,2″-三联吡啶-4-羧酸)。X射线单晶衍射分析表明,有机配体呈4种不同的配位方式;配合物1~5通过C—H…O/N氢键和π…π相互作用形成了新颖的超分子网络。研究了这些配合物的发光性能。在365 nm紫外辐射下,晶体2~5分别呈现绿色、蓝色、蓝紫色和金色。     

金属氯化物-苯并噻唑有机-无机杂化化合物的合成、表征及荧光性质

金属卤化物MCl₂（M=Pb²⁺,Cd²⁺,Co²⁺）分别与苯并噻唑（btz）在浓盐酸中、80 ℃下反应,合成了3种有机-无机杂化化合物：（btzH）[（PbCl₃）] （1）,（btzH）₂[CdCl₄]·2H₂O （2）和（btzH）₂[CoCl₄]·2H₂O （3）,其中化合物2和3结构相似。对化合物1~3进行了粉末衍射、红外和紫外光谱、元素分析、热重分析以及X射线单晶衍射表征。荧光测试发现：化合物1~3在393 nm处有发射峰,该荧光来源于苯并噻唑环中电子的π…π跃迁。     

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.