两个三维柔性功能化双苯并咪唑金属N-杂环卡宾的合成和结构

由1,1'-双苄基-3,3'-氧双(亚乙基-2,1)-二苯并咪唑六氟磷酸盐(L1)和1,1'-双(吡啶-2-甲基)-3,3'-氧双(亚乙基-2,1)-二苯并咪唑六氟磷酸盐(L2)为配体合成了[Hg(C₃₂H₂₈N₄O)](CH₃COO)(PF₆)₂ (1)和[NiCl(C₃₀H₂₈N₆O)](PF₆)₂ (2),并对其进行了结构表征。配合物1是一个罕见的三价态Hg配合物,为单斜晶系P2₁/c空间群,配合物2为单斜晶系P2₁/n的配合物。1和2中存在O-H…F,C-H…F,C-H…Cl,C-H…π,P-F…π氢键作用和π-π堆积作用,并以此分别形成了3D超分子结构。     

钴、镍多齿吡啶-胺配合物的制备及晶体结构

设计合成了4个新的钴、镍多齿吡啶-胺配合物,[M(L1)](BF₄)₂(L1=N,N,N',N'-四(2-吡啶甲基)-1,2-乙二胺;C1,M=Co;C2,M=Ni)和[M(L2)](BF₄)_n(L2=N,N,N',N'-四(2-吡啶甲基)-1,3-丙二胺;C3,M=Co,n=3;C4,M=Ni,n=2)。利用红外光谱、元素分析和X-射线单晶衍射方法对这些配合物的组成及结构进行了分析和表征。这4个配合物的单晶结构均属于单斜晶系,空间群有所不同(C1为Cc空间群,C2为P2₁/n空间群,C3为C2/c空间群,C4为P2₁/c空间群),并且4个配合物具有不同的三维堆积结构。     

钴、镍多齿吡啶-胺配合物的制备及晶体结构

设计合成了4个新的钴、镍多齿吡啶-胺配合物,[M(L1)](BF₄)₂(L1=N,N,N',N'-四(2-吡啶甲基)-1,2-乙二胺;C1,M=Co;C2,M=Ni)和 [M(L2)](BF₄)_n(L2=N,N,N',N'-四(2-吡啶甲基)-1,3-丙二胺;C3,M=Co,n=3;C4,M=Ni,n=2)。利用红外光谱、元素分析和X-射线单晶衍射方法对这些配合物的组成及结构进行了分析和表征。这4个配合物的单晶结构均属于单斜晶系,空间群有所不同(C1为Cc空间群,C2为P2₁/n空间群,C3为C2/c空间群,C4为P2₁/c空间群),并且4个配合物具有不同的三维堆积结构。     

Cl和Br取代基在晶体堆积中的交替排列：席夫碱及其铜配合物的合成与结构研究

本文合成了2个新的席夫碱,N,N'-二(5-氯水杨基)-1,3-二氨基戊烷(H₂CAP)和N,N'-二(5-溴水杨基)-1,3-二氨基戊烷(H₂BAP),以及它们的铜(Ⅱ)配合物,[Cu(CAP)](1),[Cu(BAP)](2)和[Cu(CAP)_0.5(BAP)_0.5](3),并通过元素分析、红外和电子光谱表征了它们的结构。对于配合物,还利用单晶X-射线衍射进行了结构测试。在每个配合物中,铜原子都采取四面体畸变的平面四边形配位构型。通过将配合物1和2结合在一起形成了聚集体3。在该聚集体中存在有趣的氯和溴取代基交替排列现象。     

3,6-二(N-咪唑/苯并咪唑基)哒嗪配体配合物的合成、结构、荧光及光催化性能

用溶剂热法设计、合成了4个金属-有机配合物[Mn(L¹)₄(OH)₂](1),{[MnL¹(H₂O)₄]SO₄}_n(2),[CdL²(NO₃)₂]_n(3)和{[Co(L²)₂](PF₆)₂}_n(4),(L¹=3,6-二(N-咪唑基)哒嗪,L²=3,6-二(N-苯并咪唑基)哒嗪),并通过元素分析、红外、X射线单晶衍射对配合物结构进行了表征,测试结果表明配合物1具有单核结构,2为一维链结构,配合物3和4均为二维网状结构。此外,对配合物3和4的固态荧光性能及光催化的性能做了进一步研究。     

4-甲基苯硫乙酸与含氮配体构筑的两个化合物的合成，晶体结构，热稳定性与发光性质的研究

合成了2个配合物[ZnL₂(Him)₂] (1)和[ (Cu₂L₂(phen)₂( μ₂-Cl)₂)·(Cu₂( μ₂-L)₂(phen)₂Cl₂)] (2)(L=4-甲基苯硫乙酸,Him=咪唑,phen=1,10-邻菲咯啉),进行了元素分析、红外、热重等表征,并测定了其晶体结构。配合物1晶体属于单斜晶系,空间群为C2/c。配合物2晶体属于三斜晶系,空间群为P1。配合物1是由N-H…O氢键作用形成的一维带状结构。配合物2的单胞中含有2个分别由氯原子与羧基氧原子桥联的双核独立分子,通过C-H…O,C-H…Cl氢键以及C-H…π作用而构成三维结构。室温固体荧光分析显示配合物1具有较强荧光吸收。     

3,6-二(N-咪唑/苯并咪唑基)哒嗪配体配合物的合成、结构、荧光及光催化性能

用溶剂热法设计、合成了4个金属-有机配合物[Mn(L¹)₄(OH)₂] (1),{[MnL¹(H₂O)₄]SO₄}_n (2),[CdL²(NO₃)₂]_n (3)和{[Co(L²)₂](PF₆)₂}_n (4),(L¹=3,6-二(N-咪唑基)哒嗪,L²=3,6-二(N-苯并咪唑基)哒嗪),并通过元素分析、红外、X射线单晶衍射对配合物结构进行了表征,测试结果表明配合物1具有单核结构,2为一维链结构,配合物3和4均为二维网状结构。此外,对配合物3和4的固态荧光性能及光催化的性能做了进一步研究。     

联吡啶钌(Ⅱ)配合物的合成、晶体结构及其在染料敏化太阳能电池中的应用

制备了一个多吡啶钌(Ⅱ)配合物[Ru(bipy)₂(Pyap)](PF₆)₂ (1)(bipy=2，2′-联吡啶，Pyap=4-(2-吡啶亚甲氨基)-苯酚)，研究了它在染料敏化太阳能电池中的应用，对它进行了元素分析、IR、 ¹H NMR、UV-Vis、PL、XRD、CV、IV等表征。将配合物1的水溶液自然蒸发，得到配合物[Ru(bipy)₂(Pyap)](PF₆)₂·H₂O (2)的晶体，我们测定了它的单晶结构，配合物2的晶体属单斜晶系，P2₁/c空间群。配合物1的乙腈溶液在410～490 nm处有较宽的对应于MLCT跃迁的紫外吸收峰。在波长为400 nm光的激发下，分别在436、463、490 nm处各出现了1个荧光发射峰。其CV曲线表明1有2对可逆的氧化还原峰，在-0.158 V处有1个不可逆的氧化峰。用配合物1作为光敏染料组装成电池，测得最大输出功率P_max为0.025 mW，短路电流I_sc为0.142 mA，开路电压V_oc为402 mV，填充因子ff为0.444，光电转化效率η为0.025%。     

铜(Ⅱ)-N-(2-羟苄基)-DL-α-苯丙氨酸-2，2′-联吡啶(或1，10-邻菲咯啉)三元配合物的合成、晶体结构及抑菌活性

合成了铜(Ⅱ)与N-(2-羟苄基)-DL-α-苯丙氨酸(H₂sphe)和2，2′-联吡啶(2，2′-bipy)及1，10-邻菲咯啉(phen)的三元配合物 [Cu(Hsphe)(phen)](ClO₄)·3H₂O (1)、[Cu(Hsphe)(2，2′-bipy)](ClO₄) (2)、[Cu(Hsphe)(2，2′-bipy)](NO₃) (3)。用X射线单晶衍射测定了配合物的晶体结构。3种配合物中Cu(Ⅱ)离子配位数均为5，处于变形四方锥配位环境中。抑菌活性试验结果表明，3种配合物均对金黄色葡萄球菌、铜绿假单胞菌和枯草杆菌有一定的抑制作用。配合物1还对大肠杆菌、伤寒杆菌有较强的抑制作用，而配合物3对伤寒杆菌亦有一定的抑制作用。     

两个含2,4-二氯苯氧乙酸及氮杂环配体的Ag(Ⅰ)配合物的合成及晶体结构

以2,4-二氯苯氧乙酸、2,2'-联吡啶、4,4'-联吡啶和硝酸银为原料,采用自然挥发法制备了2个配合物{[Ag₂(ELBA)(4,4'-bipy)₂(NO₃)]·2H₂O}_n (1)和[Ag₂(ELBA)2(2,2'-bipy)]_n (2)(ELBA=2,4-二氯苯氧乙酸,4,4'-bipy=4,4'-联吡啶,2,2'-bipy=2,2'-联吡啶),并对其进行了元素分析、红外光谱、热稳定性和X-射线单晶衍射的表征,研究了配合物2的荧光性质。结果表明,配合物1和2均为一维结构,其中,配合物1是通过4,4'-联吡啶和银离子间的作用形成梯状结构;而配合物2是通过Ag…Ag作用构筑S状结构。配合物中存在氢键和π-π堆积等弱的分子间作用力。     

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%.     

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.     

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.     

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.     

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.     

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.     

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.