基于3,6-二肼基-1,2,4,5-四嗪的两种高氮含能离子盐

本文通过3,6-二肼基-1,2,4,5-四嗪(DHT)分别与高氯酸和硝酸反应得到2种高氮含能离子盐,并通过X-射线单晶衍射技术对它们的结构进行了表征。(DHT)(NO₃)₂(1)属于单斜晶系,C2/c空间群,晶胞参数:a=1.3000(6)nm,b=0.8349(3)nm,c=1.0187(5)nm,β=118.89(5)°,Z=4;(DHT)(ClO₄)₂(2)属于正交晶系,P2₁2₁2空间群,晶胞参数:a=0.9804(4)nm,b=1.0747(4)nm,c=0.5325(2)nm,Z=2。采用DSC和TG-DTG技术研究了这两种含能离子盐的热分解机理,并对这两种含能离子盐的非等温动力学、爆热及感度进行了测试分析。研究表明这两种含能离子盐在敏感型含能材料领域具有潜在的应用前景。     

两个基于2-氨基-5-巯基-1,3,4-噻二唑乙酸的稀土配合物的合成、晶体结构和性质研究

用2-氨基-5-巯基-1,3,4-噻二唑乙酸(Hatma)为配体合成出2种新型同构的稀土配合物[Ln(atma)₃(H₂O)₂]_n(Ln=La(1),Nd(2))。配体和2个配合物的结构均由X-射线单晶衍射法确定,同时对配合物进行了IR,TGA及元素分析。单晶结构表明,配体属单斜晶系,C2/c空间群,晶胞参数为a=2.1419(9)nm,b=0.40076(17)nm,c=1.7500(8)nm,V=1.4950(11)nm³,Z=4;配合物1和2的晶体都属于三斜晶系,空间群为P1,配合物1的晶胞参数为a=0.8820(3)nm,b=1.2306(4)nm,c=1.2586(4)nm,V=1.2913(7)nm³,Z=2;配合物2的晶胞参数为a=0.8834(4)nm,b=1.2283(5)nm,c=1.2510(5)nm,V=1.2821(9)nm³,Z=2。2个配合物均形成一维链状空间结构,通过丰富的氢键连接形成三维超分子结构。抗菌试验表明,配合物比配体表现出更好的生物活性。初步的植物生长实验表明,配合物对油菜和小麦的生长具有一定的促进作用。     

一维链状μ-氯(氧)-三苄基锡的合成和结构研究

合成了两种具有新型结构的苄基锡化合物：一维链状μ-氯-三苄基锡(1)和一维链状μ-氧-三苄基锡(2)，经X-射线方法测定了化合物的晶体结构。晶体结构(1)属正交晶系，空间群为P2₁2₁2₁，晶体学参数：a=0.855 3(3) nm，b=1.081 4(4) nm，c=1.968 1(7) nm，V=1.820 4(11) nm³，Z=4，D_c=1.560 g·cm^-3，μ(Mo Kα)=15.47 cm^-1，F(000)=856，R₁=0.059 7，wR₂=0.141 5。晶体结构(2)属正交晶 系，空间群为P2₁2₁2₁，晶体学参数：a=1.982 3(4) nm，b=1.089 1(2) nm，c=0.861 1(17) nm，V=1.859 0(6) nm³，Z=4，D_c=1.458 g·cm^-3， μ(Mo Kα)=13.76 cm^-1，F(000)=820，R₁=0.032 7，wR₂=0.064 8。配合物中锡原子均呈五配位畸变三角双锥构型。     

2-吡嗪羧酸铜配合物的合成及其结构表征

Solvothermal reaction of 2-pyrazinic acid with Cu(SO₄)₂·5H₂O yields the title complex {[Cu₂(Pyz)₂(H₂O)₄]·SO₄}_n(1), which was characterized by elemental analysis, IR and single crystal X-ray diffraction structural analysis. The complex 1 crystallizes in Monoclinic system, space group P2₁/c, with lattice parameters a=1.126 87(6) nm, b=0.073 511(4) nm, c=1.185 06(7) nm, β=95.070(2)°, and V=0.977 83(9) nm³, Z=4, D_c=2.172 Mg·m^-3. CCDC: 692347.     

2-乙酰基吡啶缩异烟酰腙镍(Ⅱ)和铜(Ⅱ)配合物的合成、晶体结构与性质

采用常规溶液法合成了2-乙酰基吡啶缩异烟酰腙镍配合物[NiL₂](1)和铜配合物[Cu(Ac)L](2),采用元素分析、红外光谱、紫外光谱、荧光光谱和热重分析以及X-射线单晶衍射分析进行了表征.结果表明,1的晶体属正交晶系,Aba₂空间群,晶胞参数a=1.2059(3)nm,b=2.0741(5)nm,c=0.9115(2)nm,V=2.2798(10)nm³,Z=4;中心离子Ni(Ⅱ)的配位数为6,它处于畸变八面体配位环境.2属单斜晶系,P2₁/c空间群,晶胞参数a=0.86477(13)nm,b=1.3383(2)nm,c=1.3631(2)nm,β=105.650(4)°,V=1.5190(4)nm³,Z=4;中心离子Cu(Ⅱ)的配位数为5,它处于畸变四方锥配位环境,吡啶基与金属配位的结果使配合物形成一种Z形配位聚合物.配合物有很高的热稳定性,分解温度分别为340℃(1)和296℃(2).2-乙酰基吡啶缩异烟酰腙没有发光性质,而配合物1和2均可发射紫色荧光     

含联苯三羧酸及二咪唑基吡啶配体的两个锌配位聚合物的合成、结构及荧光性质

以3,3’,5-联苯三羧酸(biphenyl-3,3’,5-tricarboxylicacid,H₃bpta)、2,6-二(1-咪唑基)吡啶(2,6-bis(imidazole-1-yl)pyridine,bip)、Zn(NO₃)₂·6H₂O和ZnCl₂为原料,在水热条件下合成了配位聚合物{[Zn₃(H₂O)₇(bpta)₂]·5H₂O}_n(1)和{[Zn₂Cl(bpta)(bip)₂]·2H₂O}_n(2)。并利用红外、元素分析和X-射线单晶衍射等对其结构进行表征。X-射线单晶衍射分析表明：化合物1属于单斜晶系,C2/c空间群,a=3.3171(11)nm,b=1.4957(5)nm,c=0.6951(2)nm,β=91.50°,Z=4;化合物2属于单斜晶系,P2/c 空间群,a=1.9604(4)nm,b=1.0357(2)nm,c=1.9987(4)nm,β=101.97(3)°,Z=4。化合物1通过bpta桥联Zn(Ⅱ)形成1D链,通过配位水与羧基氧之间的氢键作用构筑成3D结构。化合物2中bip桥联Zn(Ⅱ)构成1D螺旋链状结构,进一步通过bpta桥连形成2D网状结构。此外,对化合物1和2进行了热稳定性分析和荧光性质研究。     

手性3,5-二甲基-2-芳基-2-吗啉醇盐酸盐的合成及其晶体结构

以(S)-2-氨基丙醇为手性源与α-溴-3-氯苯丙酮反应, (R)-2-氨基丙醇为手性源与6-甲氧基-2-(2-溴丙酰基)萘反应, 分别合成了手性纯化合物(2R,3R,5S)-3,5-二甲基-2-(3-氯苯基)-2-吗啉醇盐酸盐(4a)和(2S,3S,5R)-3,5-二甲基-2-(6-甲氧基-2-萘基)-2-吗啉醇盐酸盐(4b), 利用X射线单晶衍射仪测定了两化合物的晶体结构和两化合物的空间结构, 并初步分析两化合物空间结构, 化合物4a晶体属正交晶系, 空间群为P2₁2₁2, 晶胞参数为: a＝0.8718(2) nm, b＝0.7883(2) nm, c＝2.0247(6) nm, Z＝4, V＝1.3915(7) nm³, D_c＝1.328 g/cm³, F(000)＝584, R₁＝0.0399, wR₂＝0.0797, S＝1.042. 化合物4b晶体属正交晶系, 空间群为P2₁2₁2₁, 晶胞参数为: a＝0.71035 (9) nm, b＝0.77703(10) nm, c＝2.9820(4) nm, Z＝4, V＝1.6318(4) nm³, D_c＝1.318 g/cm³, F(000)＝688, R₁＝0.0520, wR₂＝0.1108, S＝0.994.     

两个7-氧杂-二苯芴-3，11-二磺酸镉化合物的合成、结构与荧光性质研究(英)

通过使用浓硫酸对2，2′-二羟基-1，1′-二萘的磺化与成环反应得到一种新配体，7-氧杂-二苯芴-3，11-二磺酸。通过水热方法得到了它的两个化合物，[CdL(bipy)₂(H₂O)][Cd(bipy)₂(H₂O)₂]·L·H₂O (1)和[CdL(phen)₂(H₂O)]·5H₂O (2)，并通过X-射线单晶衍射分析进行结构表征。化合物1以P1空间群结晶，晶胞参数为a=1.205 5(6)，b=1.576 4(8)，c=1.954 5(10) nm，α=75.755(9)，β=88.093(10)，γ=89.035(10)°。化合物2以P2₁/ c空间群结晶，晶胞参数为a=2.104 0(7)，b=1.358 0(4)，c=1.428 9(5) nm，β=94.543(6)°。在化合物1中，有两个独立的镉(Ⅱ)离子不对称单元，在其中镉(1)离子和两个联吡啶上的四个氮原子，磺酸配体上的一个氧原子及一个水分子配位；镉(2)离子和两个联吡啶上的四个氮原子和两个水分子配位。两种固体化合物在室温下均显示强的蓝色荧光。     

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。     

3-(2,4-二羧基苯基)-2,6-二羧基吡啶原位脱羧构筑两个配位聚合物的结构及磁性

通过水热法合成了2个配位聚合物:[Cu(H₂dpcp)₂]_n (1)和[Mn₂(Hdpcp)₂(H₂O)₂·2H₂O]_n (2)[H₃dpcp=5-(2,4-二羧基苯基)-2-羧基吡啶],H₃dpcp由3-(2,4-二羧基苯基)-2,6-二羧基吡啶(H₄dpdp)原位脱羧生成.X-射线单晶衍射测得2个化合物都属于单斜晶系,化合物1结晶在P2₁/c空间群,a=0.639(13) nm,b=1.835(4) nm,c=1.115(2) nm,β=102.29(3)°,Z=2;化合物2结晶在C2/c空间群,a=3.126(6) nm,b=1.004(2) nm,c=1.080(2) nm,β=93.73(3)°,Z=4.化合物1以配体H₂dpcp-桥连Cu(Ⅱ)形成一维链状结构.化合物2通过Hdpcp²-桥连Mn(Ⅱ)形成二维层状结构,并进一步通过氢键作用形成三维超分子结构.负的Weiss常数θ表明化合物2存在反铁磁耦合作用.     

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%.     

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.     

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.     

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.     

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.     

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.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.