[Co(N-(3-Aminopropyl)-1,3-propanediamine)(2-(Aminomethyl)pyridine) Cl][ZnCl_4]的一对差向异构体的合成及晶体结构

用过氧化物法合成了 [Co(3,3-tri)(amp)Cl][ZnCl4]的两个经式异构体,晶体结构解析表明两者互为差向异构体。其中反式异构体 (仲氢相对于 Cl)晶体属单斜晶系,空间群 C2/c, a=2.7663(7)nm, b=0.9505(1)nm, c=1.8288(4)nm,β =105.57(2)°, V=4.632(1)nm3, Dc=1.706g· cm-3, Z=8, F000=2432.00,μ (MoKα )=23.51cm-1, R=0.033, Rw=0.041;顺式异构体 (仲氢相对于 Cl)晶体属三斜晶系,空间群, a=1.0790(2)nm, b=1.1749(1)nm, c=0.8920(1)nm,α =90.73(1)°,β =109.573(9)°,γ =80.60(1)°, V=1.0500(2)nm3, Dc=1.71g· cm-3, Z=2, F000=548.00,μ (MoKα )=25.73cm-1, R=0.022, Rw=0.030。两异构体中 Co3＋为六配位,其差异仅表现在 3,3-tri仲胺上氢的取向不同。     

二苄基二氯化锡三苯基氧膦的合成及晶体结构研究

利用二苄基二氯化锡与三苯基氧膦反应 ,合成了目标化合物二苄基二氯化锡三苯基氧膦 ,其结构经元素分析表征。用X 射线单晶衍射测定其晶体结构属于三方晶系 ,空间群为P2 1,a =2 .0 2 7( 4 )nm ,b =0 .9714 ( 17)nm ,c =1.5 5 9( 3)nm ,α =90° ,β =90° ,γ =90° ,Z =4 ,V =3.0 4 9( 10 )nm3 ,Dc =1.4 0 7mg·m-3 ,u =1.0 81mm-1,F( 0 0 0 )=1312 ,R1=0 .0 370 ,wR2 =0 .0 6 88,晶体中心的Sn原子为五配位的畸变三角双锥构型     

[Co(aipamp或apamp)(amp)Cl][ZnCl4]两体系中四个几何异构体的合成、结构解析以及量子化学计算

利用单晶X射线衍射解析了[Co(aipamp)(amp)Cl][ZnCl4] (aipamp=2-[(2-氨基异丙基)氨基甲基]呲啶,amp=2-(氨基甲基)吡啶)体系中两个异构体Ⅱ的结构和[Co(apamp)(amp)Cl][ZnCl4](apamp=2-[(2-氨基丙基)氨基甲基]呲啶)体系中一异构体Ⅲ的结构.晶体Ⅰ属单斜晶系,空间群P21/n, a=1.08028(10) nm, b=1.84843(18) nm, c=1.25582(12) nm, α=90.00°, β=97.150(2)°, γ=90.00°, V=2.4881(4) nm3, Dc=1.620 g·cm-3, Z=6, F(000)=582, R=0.0361, wR=0.0974,晶胞中含4个配合物阳离子,4个[ZnCl4]2-阴离子;晶体II属三斜晶系,空间群 P1, a=0.9957(2) nm, b=1.0207(3) nm, c=1.1478(3) nm, α= 102.584(5)°, β=91.559(5)°, γ=98.462(5)°, V=1.1240(5) nm3, Dc=1.699 g·cm-3, Z=2, F(000)=580.00, R=0.0449, wR=0.0984,晶胞中含2个配合物阳离子,2个[ZnCl4]2-阴离子.晶体III属三斜晶系,空间群P1, a=0.82423(7) nm, b=1.7199(8) nm, c=1.36399(1) nm, α=86.6350(10)°, β=81.7140(10)°, γ=67.6230(10)°, V=1.10278(15) nm3, Dc=1.734 g·cm-3, Z=2, F(000)=582.00, R=0.0332, wR=0.0823,晶胞中含4个配合物阳离子,4个[ZnCl4]2-阴离子.三异构体中Co3+为六配位,且配合物阳离子中具有C-H…π 结构.用一、二维核磁共振技术解析了第四个配合物在溶液中的结构,论证了该异构体属于[Co(apamp)(amp)Cl][ZnCl4]体系.4个异构体具有共同的结构特征--分子内C-H…π结构.     

[Co(N-(3-Aminopropyl)-1,3-propanediamine)(2-(Aminomethyl)pyridine) Cl][ZnCl4]的一对差向异构体的合成及晶体结构

用过氧化物法合成了[Co(3,3-tri)(amp)Cl][ZnCl4]的两个经式异构体,晶体结构解析表明两者互为差向异构体。其中反式异构体(仲氢相对于C1)晶体属单斜晶系,空间群C2/c,a=2．7663(7)nm,b=0．9505(1)nm,c=1.8288(4)nm,β=105.57(2)°,V=4.632(1)nm3,Dc=1.706g·cm-3,Z=8,F     

芳香碘基辅助的配位超分子自组装——锌(II)、镉(II)与7-碘-8-羟基喹啉-5-磺酸配合物的合成和结构

合成了锌 (II)、镉 (II)与 7 碘 8 羟基喹啉 5 磺酸 (IHQS)的两种单晶配合物 [Zn(IHQS) (H2 O) 3 ] 2 ·4H2 O ( 1)和 [Cd (IHQS) (H2 O) 2 ] n·2nH2 O ( 2 ) ,用X射线衍射法确定了结构 .结果表明 ,1和 2均由一对对映体配合物构成 :1中两个 [Zn (IHQS) (H2 O) 3 ]对映体通过磺酸基 -锌 (II)八面体轴向互补配位形成中心对称双分子聚合体 ,该聚合体通过分子间磺酸基氧 -配位水氢键形成独特的二维层状结构 ;2的两个 [Cd(IHQS) (H2 O) 2 ]对映体通过镉 (II) 磺酸基 -镉 (II)双向互补配位形成一维直线型聚合配位结构 .芳香碘基呈现新颖的碘 -芳环氢和碘 -磺酸基氧等弱相互作用模式 ,并对上述结构的支撑稳定发挥重要的结构辅助作用 .本文展示了芳香碘基、磺酸基和喹啉环三种弱相互作用基团在配位超分子自组装中的形状、空间匹配和协同促进模式 .结晶学参数配合物 1:单斜晶系 ,C2 /c空间群 ,a =2 2 2 43 ( 7)nm ,b =1 0 0 5 3 ( 3 )nm ,c =1 3 468( 4 )nm ,β =10 2 2 67( 5 )° ,V =2 942 8( 16)nm3 和Z =4.配合物 2 :三斜晶系 ,P1- 空间群 ,a =0 6949( 2 )nm ,b =1 0 183 ( 3 )nm ,c =1 0 989( 3 )nm ,α =76 0 69( 5 )° ,β =75 2 94( 5 )° ,γ =84 747( 5 )° ,V =0 72 95 ( 4 )nm3 和Z =2 .     

[Co(2,3-tri)(cmen)Cl][ZnCl4]配合物的合成及其两经式异构体的晶体结构

合成了[Co(2,3-tri)(cmen)Cl][ZnCl4](2,3-tri=N-(2-胺乙基)-1,3-丙二胺;cmen=1,2-二胺基丙烷)体系中的部分配合物异构体,解析了其中两异构体的晶体结构.其中晶体(Ⅰ)属单斜晶系,空间群P21/c,a=1.0211(2)nm,b=0.9208(2)nm,c=1.9511(4)nm,β=97.907(4)°,V=1.8161(7)nm3,Dc=1.803g@cm-3,Z=4,F(000)=1000.00,μ(MoKα)=29.66cm-1,R=0.0317,Rw=0.0923,晶胞中含4个配合物阳离子,4个[ZnCl4]2-阴离子;晶体(Ⅱ)属三斜晶系,空间群P1,a=0.90953(18)n,,b=0.9694(2)nm,c=1.1771(2)nm,α=110.669(4)°,β=92238(4)°,y=91.211(4)°,V=0.9697(3)nm3,Dc=1.750g@cm-3,Z=2,F(000)=52000,μ(MoKα)=27.84cm-1,R=0.0365,Rw=0.0975,晶胞中含2个配合物阳离子,2个[ZnCl4]2-阴离子及2个水分子.两异构体中Co3+为六配位,其差异仅表现在二元胺(cmen)中甲基的取向不同.在结构单元中对映体的比例为11.     

硝酸钍氧化膦取代杯芳烃配合物的合成与结构

合成了一种硝酸钍与氧化膦取代杯芳烃衍生物的配合物 ,[L·Th(OH2 ) (NO3 ) 2 ] [Th(NO3 ) 6]·CH3 CN {L =四 (亚甲基二苯基氧化膦 )杯 [4 ]芳烃 }.通过元素分析和红外光谱对配合物进行了表征 .用X射线单晶衍射法测定了其晶体结构 .晶体属三斜晶系 ,P 1空间群 ,晶胞参数a =1 990 ( 7)nm ,b =2 2 17( 8)nm ,c =2 890 ( 10 )nm ;α =10 4 92 ( 12 )° ,β =10 0 76( 14 )° ,γ =93 13 ( 10 )° ,Z =4;V =12 0 3 3 ( 7)nm3 ,R1=0 0 90 1,wR2 =0 190 7.此配合物由配阳离子和配阴离子构成 .配阳离子中 ,1个Th4+ 与杯芳烃中的 4个磷氧键上的氧原子 ,2个双齿配位的硝酸根中的 4个氧原子 ,以及 1个水分子的氧原子配位 ,构成 1个九配位的单帽四方反棱柱体 ;配阴离子中 ,1个Th4+ 与 6个双齿配位的硝酸根离子配位     

[Co(2,3-tri)(een)Cl][ZnCl4]配合物的合成及部分异构体的晶体结构测定

用过氧化物法合成、分离了[Co(2,3-tri)(een)Cl][ZnCl4](2,3-tri=N-(2-胺基乙基)-1,3-丙二胺,een=N-乙基乙二胺)体系中的部分异构体,解析了其中两异构体的晶体结构.其中晶体(Ⅰ)属单斜晶系,空问群p21/n,a=0.8611(4)nm,6=1.7906(9)nm,c=1.3374(7)nm,β=107.627(8)°,V=1.9653(16)nm3,Dc=1.713g·cm-3,Z=4,F(000)=1032,μ(MoKc)=27.43cm-1,R=0.0725,Rw=O.1798;晶体(Ⅱ)同属单斜晶系,空间群P21/c,a=0.9799(3)nm,b=2.6815(9)nm,c=0.8107(3)nm,β=107.595(6)°,V=2.0305(11)nm3,Dc=1.658g·cm-3,Z=4,F(000)=1032,μ(MoKa)=26.62em-1,R=0.0660,Rw=0.1536.两异构体中Co3+为六配位,其差异仅表现在二元胺(een)中乙基的取向不同.晶胞中含4个配合物阳离子,4个[ZnCl4]2-阴离子.在结构单元中对映体的比例为11.     

钴的二膦酸配合物[ Co(en) 3 ] [ Co2 (Hedbbp) 2 ]· 7H2O的合成与晶体结构

水热条件下合成了一个新的有机二膦酸钴配合物[Co(en)3][Co2(Hedbbp)2]·7H2O,[H4edbbp=N,N'-二(苄基膦酸)乙二胺].X射线单晶衍射结构分析表明配合物属三斜晶系,空间群P-1,晶胞参数a=1.505.6(3)nm,b=1.524 8(3)nm,c=1.649 7(3)nm,α=63.10(3)°,β=78.12(3)°,γ=75.62(3)°,晶胞 体积为V=3.2524(11)nm3,Z=2.配合物结构单元中包含一个二膦酸钴的二聚单元阴离子[Co2(Hedbbp)2]2-和一个三乙二胺合钴螯合阳离子单元[Co(en)3]2+和七个水分子.     

有机三膦酸锌配合物的合成与晶体结构

合成了一种新型的有机三膦酸配体H6aptp[1-氨基-丙基-1,1,3-三膦酸],并在水热条件下合成了它的锌配合物[Zn(H4aptp)(2,2′-bipy)(H2O)].2H2O.用红外、质谱、元素分析、热重分析等手段对其进行了表征并解析了它的单晶结构.实验结果表明:配合物属三斜晶系,空间群为P,ī晶胞参数为a=0.66814(5)nm,b=1.00929(7)nm,c=1.5438(11)nm,α=81.544(10)°,β=79.066(10)°,γ=82.278(10)°,Z=2,V=1.00495(13)nm3,配合物在空间上以一维链状方式排列.     

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.     

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.     

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.     

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.     

关于"对‘燃料电池物理及化学性能的有限时间热力学分析方法'的讨论”答复

把有限时间热力学理论用于化学过程的研究,将会得到一系列新的结论,开展这方面的研究是很有意义的.文献[1]以燃料电池为例,在同时考虑化学反应及传热不可逆性的情况下,研究了燃料电池的性能界限,文献[2]指出了文献[1]计算化学反应及传热不可逆性而引起系统与有关环境的总熵产生率的错误以及由此而导致的结论所存在的问题,并进行了富有启发性的分析与讨论.但文献[2]对于系统与有关环境的总熵产生率的计算也是不正确的,由此得到的其它结论自然不能成立.本文将就此情况下系统与有关环境的总熵产生率的计算再次进行讨论,并给出电池功率和效率的有限时间热力学性能界限.