香草醛缩多胺Schiff碱Co(II)配合物固相合成及氧合性能研究

采用固相反应合成了三个新的席夫碱钴(II)配合物, 在室温下, 将其与O₂作用, 1 mol配合物吸收2 mol O₂, 得到三种固态氧合配合物[Co•(L₁)₂•(O₂)₂](NO₃)₂•2H₂O [L₁＝N,N-二(4-羟基-3-甲氧基苯亚甲基)二乙烯三胺], [Co•(L₂)₂•(O₂)₂](NO₃)₂•2H₂O [L₂＝N,N-二(4-羟基-3-甲氧基苯亚甲基)三乙烯四胺]和[Co•(L₃)₂•(O₂)₂](NO₃)₂•2H₂O (L₃＝N,N-二(4-羟基-3-甲氧基苯亚甲基)四乙烯五胺]. 通过元素分析、红外光谱、核磁共振氢谱(¹H NMR), TG/DTA、摩尔电导率、紫外等测试手段确定了氧合配合物的组成. 采用失重法测定了氧合配合物中的配位氧, 确定1 mol钴配合物吸收2 mol O₂, 其中1 mol O₂用来和钴离子配位形成超氧配合物.     

1-亚甲基苯并咪唑-1,4,7-三氮环壬烷配体及其铜配合物[Cu(C14H21N5)Br]2•[CuBr4]的合成与晶体结构

采用新的方法合成了1-亚甲基苯并咪唑-1,4,7-三氮环壬烷配体, 利用该配体合成了一个新的铜配合物[Cu(C₁₄H₂₁N₅)Br]₂•[CuBr₄] ([Cu(C₁₄H₂₁N₅)Br]^＋•[CuBr₄]^2－•[Cu(C₁₄H₂₁N₅)Br]^＋), 并测定了它的晶体结构, 结果表明: 该配合物的晶体属于单斜晶系的C2/c空间群, 晶胞参数a＝1.96209(15) nm, b＝0.82319(5) nm, c＝2.39249(15) nm, α＝90.00°, β＝102.996(2)°, γ＝90.00°, V＝3.7653(4) nm³, Z＝4, μ(Mo Kα)＝8.083 mm^－1, D_c＝2.097 Mg/m³, F(000)＝2308, R＝0.0417, wR＝0.0945, GOF＝0.933. 该配合物由两个1-亚甲基苯并咪唑-1,4,7-三氮环壬烷一溴合铜配阳离子和一个四溴合铜配阴离子组成. 在两个配阳离子中, 每个Cu(II)离子与五个配位原子配位(四个氮原子和一个溴阴离子), 位于一个变形四方锥的中心. 在配阴离子中, Cu(II)离子与四个溴阴离子配位, 位于一个稍变形四面体的中心.     

Eu(C10H9N2O4)(C10H8N2O4)(H2O)3]•0.5bipy•3H2O配合物的合成、晶体结构及荧光性质

在水-乙醇混合体系中, 以2-羰基丙酸水杨酰腙(C₁₀H₁₀N₂O₄)、2,2-联吡啶(C₁₀H₈N₂, 简写bipy)与Eu(NO₃)₃•4H₂O反应, 首次培养出黄色单晶[Eu(C₁₀H₉N₂O₄)(C₁₀H₈N₂O₄)(H₂O)₃]•0.5bipy•3H₂O. 该晶体属三斜晶系, 空间群为P-1, 晶胞参数a＝0.93392(16) nm, b＝1.3100(2) nm, c＝1.3895(2) nm, α＝97.205(3)°, β＝105.411(2)°, γ＝106.364(2)°, V＝15.35(2) nm³, Z＝2, μ＝2.118 mm^－1, D_c＝1.686 Mg/m³, F(000)＝786, R＝0.0116, wR＝0.0507, GOF＝0.995. 晶体测试结果表明, 该单晶结构为铕的9配位配合物, 两个2-羰基丙酸水杨酰腙分别以负一价和负二价酮式和三个水分子同时参与配位; 每个2-羰基丙酸水杨酰腙中的羧基氧、酰胺基中的羰基氧和C＝N中的氮与Eu^3＋配位, 形成两个共边的稳定五元环, 另三个配位原子则分别来自三个水分子中的氧原子, 该配合物在空间呈扭曲的单帽四方反棱柱, 而在不对称单位中还有游离的一个2,2-联吡啶分子和三个水分子, 这些游离分子与配位分子之间存在大量分子内和分子间氢键, 整个分子在空间呈三维网状结构. 发光性能测试表明该配合物具有很好的荧光性质.     

由芳香羧酸和1,3,5-三咪唑基苯为配体构筑的锌、镉配合物的合成、结构和荧光性质

通过水热法得到了2个配位聚合物{[Zn(timb)(BTEC)_0.5]·H₂O}_n(1)和{[Cd(timb)(DPA)]·H₂O}_n(2)(timb=1,3,5-三咪唑基苯,H₄BTEC=均苯四甲酸,H₂DPA=2,2-联苯二甲酸),对它们进行了元素分析、红外光谱分析,并利用X射线衍射测定了它们的单晶结构。 配合物1属于三斜晶系,P1空间群。配合物2属于单斜晶系,C2/c空间群。配合物1拥有一个不寻常的三维框架结构,其拓扑为(4.6³·8⁶)₂(4²·8⁴)(6³)₂;而配合物2具有一维单层纳米管结构。结果说明了金属离子和有机羧酸配体在配合物组装过程中起着非常重要的作用。此外,在室温下对2个配合物进行了荧光性质分析。     

一种含咔唑基团的混配型钌(II)配合物的合成、表征和酸碱性质研究

合成了钌(II)配合物cis-[Ru(HL)(Hdcbpy)(NCS)₂]^－•[N(C₄H₉)₄]^＋ (HL＝2-(9-乙基-9H-3-咔唑基)-1H-咪唑[4,5-f] [1,10]邻菲啰啉, H₂dcbpy＝4,4'-二羧酸-2,2'-联吡啶). 采用元素分析、核磁共振氢谱、红外光谱、紫外-可见吸收光谱、质谱(MS)对配合物进行了表征. 通过紫外-可见吸收光谱和稳态荧光光谱, 研究了该配合物的基态和激发态酸碱性质. 结果表明该配合物在基态时能发生5步质子化/去质子化反应, 表现出基于光致发光强度和激发态能量转移途径的质子化/去质子化诱导的分子开关性质.     

钒卤代过氧化物酶构象模型分子的设计、合成及仿生催化活性

基于钒卤代过氧化物酶(V-HPOs)活性中心的N、O配位环境及活性中心与氨基酸残基、水分子之间的氢键作用的模拟, 我们设计、合成了两种钒氧配合物: (C₃H₅N₂)₂[(VO)₂(μ₂-C₂O₄)(C₂O₄)₂(H₂O)₂] (1)和(VO₂)₂(μ₂- C₂O₄)(C₂H₄N₂)₂ (2), 并通过X射线单晶衍射方法确定了它们的结构. 晶体结构分析表明上述钒氧配合物的配位环境与(V-HPOs)活性中心十分相似, 且在配合物的三维堆积结构中具有类α-螺旋结构. 溴化反应活性研究发现这些钒氧配合物在仿生催化实验中表现出较高的催化活性.     

一个基于2-(2-羧基苯基)-1H-咪唑并[4,5-f][1,10]邻菲啰啉配体的二维铅(Ⅱ)配合物的水热合成及晶体结构

在水热条件下,利用邻菲啰啉衍生物2-(2-羧基苯基)-1H-咪唑并[4,5-f][1,10]邻菲啰啉(HL)和Pb(NO₃)₂反应合成了一个配合物[PbL₂]_n (1),并用红外、元素分析和X射线单晶衍射对其结构进行了表征。配合物1属于单斜晶系,空间群为P2₁/c,晶胞参数a=1.345 9(9) nm,b=0.709 4(5) nm,c=3.265 5(2) nm,β=99.6260(10)°,V=3.074 0(4) nm³,Z=4,C₄0H₂₂N₈O₄Pb,M_r=885.85,D_c=1.914 g·cm^-3,μ(Mo Κα)=5.551 mm^-1,F(000)=1 728,GOOF=1.038,R=0.027 0,wR=0.058 1,其中5 067个可观测点(I>2σ(I))。结构分析表明配合物1为二维层状结构。此外,对配合物的热稳定性和发光性质也进行了研究。     

稀土配合物[Pr(C3H7NO2)2(C3H4N2)(H2O)](ClO4)3的标准生成焓及热分解动力学研究

合成了高氯酸镨和咪唑(C₃H₄N₂), DL-α-丙氨酸(C₃H₇NO₂)混配配合物晶体. 经傅立叶变换红外光谱、化学分析和元素分析确定其组成为[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃. 使用具有恒温环境的溶解-反应量热计, 以2.0 mol•L^－1 HCl为量热溶剂, 在T＝(298.150±0.001) K时测定出化学反应PrCl₃•6H₂O(s)＋2C₃H₇NO₂(s)＋C₃H₄N₂(s)＋3NaClO₄(s)＝[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s)＋3NaCl(s)＋5H₂O(1)的标准摩尔反应焓为Δ_rH_m^ө＝(39.26±0.11) kJ•mol^－1. 根据盖斯定律, 计算出配合物的标准摩尔生成焓为Δ_fH_m^ө{[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s), 298.150 K}＝(－2424.2±3.3) kJ•mol^－1. 采用TG-DTG技术研究了配合物在流动高纯氮气(99.99%)气氛中的非等温热分解动力学, 运用微分法(Achar-Brindley-sharp和Kissinger法)和积分法(Satava-Sestak和Coats-Redfern法)对非等温动力学数据进行分析, 求得分解反应的表观活化能E＝108.9 kJ•mol^－1, 动力学方程式为dα/dt＝2(5.90×10⁸/3)(1－α)[－ln(1－α)]^－1exp(－108.9×10³/RT).     

3-羟基-1-金刚烷甲酸镉(Ⅱ)配合物的合成、表征、晶体结构和热分解动力学研究

以氧化镉,邻菲咯啉(phen)和3-羟基-1-金刚烷甲酸(C₁₀H₁₅(OH)COOH)为原料,水热合成配合物[Cd(C₁₀H₁₅(OH)COO)₂(phen)₂]·C₁₀H₁₅(OH)COOH·5H₂O。用元素分析、红外光谱、¹H NMR核磁共振、热重分析以及单晶衍射等手段进行表征,测定了它的晶体结构;晶体属于三斜晶系,空间群P1。测定了配合物的热分解情况,并用TG-DTG方法研究了热分解动力学机理。     

稀土配合物[Pr(C3H7NO2)2(C3H4N2)(H2O)](ClO4)3的标准生成焓及热分解动力学研究

合成了高氯酸镨和咪唑(C₃H₄N₂), DL-α-丙氨酸(C₃H₇NO₂)混配配合物晶体. 经傅立叶变换红外光谱、化学分析和元素分析确定其组成为[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃. 使用具有恒温环境的溶解-反应量热计, 以2.0 mol•L^－1 HCl为量热溶剂, 在T＝(298.150±0.001) K时测定出化学反应PrCl₃•6H₂O(s)＋2C₃H₇NO₂(s)＋C₃H₄N₂(s)＋3NaClO₄(s)＝[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s)＋3NaCl(s)＋5H₂O(1)的标准摩尔反应焓为Δ_rH_m^ө＝(39.26±0.11) kJ•mol^－1. 根据盖斯定律, 计算出配合物的标准摩尔生成焓为Δ_fH_m^ө{[Pr(C₃H₇NO₂)₂(C₃H₄N₂)(H₂O)](ClO₄)₃(s), 298.150 K}＝(－2424.2±3.3) kJ•mol^－1. 采用TG-DTG技术研究了配合物在流动高纯氮气(99.99%)气氛中的非等温热分解动力学, 运用微分法(Achar-Brindley-sharp和Kissinger法)和积分法(Satava-Sestak和Coats-Redfern法)对非等温动力学数据进行分析, 求得分解反应的表观活化能E＝108.9 kJ•mol^－1, 动力学方程式为dα/dt＝2(5.90×10⁸/3)(1－α)[－ln(1－α)]^－1exp(－108.9×10³/RT).     

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.     

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.     

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.