以4,4-联苯二甲酸和咪唑基化合物为配体的钴配合物的合成和晶体结构

以4,4-联苯二甲酸(H₂BPDC)和4,4-二咪唑基二苯醚(BIDPE)为原料,与硝酸钴在不同温度下反应,得到2个结构不同的配位聚合物{[Co₂(BPDC)₂(BIDPE)₂(H₂O)]·2H₂O}_n(1)和{[Co(BPDC)(BIDPE)]·H₂O}_n(2)。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属于单斜晶系,C2/c空间群,a=1.45602(15) nm, b=1.55751(16) nm, c=2.5226(3) nm, β=90.8340(10)°, V=5.7202(10) nm³, Z=4, M_r=1256.98, D_c=1.460 g·cm^-3, μ=0.655, F(000)=2592, R₁=0.0367, ωR₂=0.0875(I>2σ(I))。配合物2属于三斜晶系,P1空间群,a=1.06192(10) nm, b=1.09851(11) nm, c=1.32451(13) nm, α=112.7250(10) nm, β=92.1120(10)°, γ=96.5740(10)°, V=1.4102(2) nm³, Z=2, M_r=619.48, D_c=1.459 g·cm^-3, μ=0.662, F(000)=638, R₁=0.0474, ωR₂=0.1165(I>2σ(I))。单晶结构分析显示,配合物1拥有一维链状结构,而配合物2具有二维两重贯穿结构,并表现出聚轮烷的结构特征。结果说明了反应温度在配合物组装过程中起着非常重要的作用。     

三维Mn(Ⅱ)-Sm(Ⅱ)杂核和二维同核Sm(Ⅱ)配合物的合成、晶体结构与性质

利用过渡金属锰盐与稀土盐水热合成了杂核化合物{[MnSm₂(INAIP)₄(H₂O)₄]·2H₂O}_n(1)和同核{[Sm(INAIP)(HINAIP)]·2H₂O}_n(2)(INAIP=异烟酰胺吡啶基异酞酸根),并对其进行了元素分析、IR及X-射线衍射法表征。晶体结构研究表明:配合物1属于三斜晶系,P1空间群。晶胞参数:a=1.0188(5)nm,b=1.08386(6)nm,c=1.38721(8)nm,V=1.475(14)nm³,Z=1,D_c=1.802g·cm^-3,μ=2.271mm^-1,F(000)=793,R_int=0.0105,R₁=0.0512,wR₂=0.1319。配合物2属于单斜晶系,P2₁/c空间群。晶胞参数:a=1.34305(18)nm,b=1.3765(17)nm,c=1.62408(15)nm,V=2.7028(6)nm³,Z=4,D_c=1.861g·cm^-3,μ=2.251mm^-1,F(000)=1500,R_int=0.0514,R₁=0.0322,wR₂=0.0887。配合物1是由配体INAIP连接稀土钐离子形成二维层状结构,该二维层通过Mn-O和Mn-N键连接成三维非贯穿网络结构。而配合物2是由配体INAIP连接稀土钐离子形成二维双层状结构,该二维层通过氢键连接成三维网络结构。配合物1失去水分子后具有稳定微孔结构,对二氧化碳具有一定的吸附,而对氮气没有吸附作用。此外,配合物1和2具有典型的稀土钐离子红色荧光性能。     

四(邻氟苄基)锡及一维链状三苄基锡二茂铁甲酸酯的合成、结构及性质

合成了四(邻氟苄基)锡(1)和一维链状三苄基锡二茂铁甲酸酯(2),经X射线衍射方法测定了化合物的晶体结构.化合物1属为四方晶系,空间群I4₁/a,晶体学参数a=1.967 94(16) nm,b=1.967 94(16) nm,c=0.593 16(5) nm,V=2.297 2(3) nm³,Z=4,D_c=1. 605 g·cm^-3,μ(Mo Kα)=11.58 cm^-1,F(000)=1 112,R₁=0.020 8,wR₂=0.057 6.化合物2属单斜晶系,空间群为P2₁/n,晶体学参数:a=1.593 54(12) nm,b=1.007 23(8) nm,c=1.700 26(13)56 nm,β=91.001(10)°,V=2.728 6(4) nm³,Z=4,D_c=1.521 g·cm^-3,μ(Mo Kα)=14.74 cm^-1,F(000)=1 256,R₁=0.038 4,wR₂=0.095 2.晶体的中心锡原子分别呈四配位畸变四面体构型和五配位畸变三角双锥构型.对其结构进行量子化学从头计算,探讨了配合物的稳定性、分子轨道能量以及部分前沿分子轨道的组成特征.测定了配合物的热稳定性和体外抗癌活性.     

(μ-FcC≡CH)Co2(CO)6簇合物羰基取代衍生物的合成和分子结构

The substituted reactions of (μ-FcC≡CH)Co₂(CO)₆ with PPh₃, AsPh₃ and dppm have been studied and three new substituted derivatives have been obtained. The compounds were characterized by elemental analysis, IR, ¹H NMR, MS and X-ray crystallography. They have the following formula: (μ-FcC≡CH)Co₂(CO)_6-nL[n=1, L=PPh₃（2）, AsPh₃（3）; n=2, L=dppm (4)]. The cluster 2 crystallizes in monoclinic, space group P2₁/n, with a=1.342 4(8) nm, b=1.305 4(8) nm, c=1.875 0(9) nm, β=103.084(9)°, V=3.201(3) nm³, Z=4, F(000)=1 480, D_c=1.515 g·cm^-3, μ=15.62 cm^-1; final R indices [I > 2σ(I)]: R₁=0.040 9, ωR₂=0.076 9; S=1.007, Δρ_max=463e·nm^-3, Δρ_min=-395 e·nm^-3. The cluster 3 crystallizes in monoclinic, space group P2₁/n, with a=1.341 0(4) nm, b=1.307 9(4) nm, c=1.912 0(5) nm, β=103.043(5)°, V=3.267(15) nm³, Z=4, F(000)=1 552, D_c=1.574 g·cm^-3, μ=24.87 cm^-1; final R indices[I> 2σ（I）]：R₁=0.0437, ωR₂=0.078 2; S=0.995, Δρ_max=530 e·nm^-3, Δρ_min=-444 e·nm^-3. CCDC: 221860, 2; 221863, 3.     

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。     

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.     

二羟基萘二磺酸根构筑的一维链状镉配位聚合物的合成与晶体结构

采用常规溶液挥发法,3,6-二羟基-2,7-萘二磺酸二钠盐(Na₂H₂dhns)、咪唑(imdz)与Cd(NO₃)₂·4H₂O在甲醇-水溶液中反应合成了一种一维镉配位聚合物{[Cd₂(dhns)(imdz)₄]·H₂O}_n(1),并用元素分析、IR、UV、PL和TG等方法进行了表征。经X-射线单晶衍射分析确定了其晶体结构,晶体属单斜晶系,空间群C2/m,晶胞参数a=1.24597(6)nm,b=1.55833(9)nm,c=1.62999(10)nm,β=90.258(6)°,V=3.1648(3)nm³,Z=4,M_r=831.39,D_c=1.745g·cm^-3,μ=1.534mm^-1,F(000)=1640,R=0.0564,wR₂=0.1405,S=1.09。每个Cd(Ⅱ)处于畸变的八面体配位环境,2个八面体共同形成双核金属簇,金属簇经dhns^4-四重桥联形成一维配位聚合物。     

以对苯二氧基二乙酸和咪唑基化合物为配体的镍、镉配合物的合成和晶体结构

以对苯二氧基二乙酸(H₂BDOA)和4,4-二咪唑基二苯醚(BIDPE)为原料,分别与氯化镍、氯化镉在水热条件下反应,得到2个结构不同的配位聚合物[Ni(BDOA)(BIDPE)(H₂O)]_n (1)和[Cd(BDOA)_0.5(BIDPE)Cl]_n (2)。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,a=0.934 97(8) nm,b=1.032 31(9) nm,c=1.352 91(12) nm,α=96.398 0(10),β=90.729 0(10),γ=102.027 0(10),V=1.268 31(19) nm³,Z=2,M_w= 603.22,D_c=1.580 g·cm^-3,μ=0.827,F(000)=624,R₁=0.039 5,wR₂=0.089 5(I >2σ(I))。配合物2也属于三斜晶系,P1 空间群,a=1.017 51(7) nm,b=1.042 99(7) nm,c=1.173 38(8) nm,α=68.723 0(10)°,β=71.826 0(10)°,γ=76.091 0(10)°,V=1.091 05(13) nm³,Z=2,M_w=562.26,D_c=1.711 g·cm^-3,μ=1.163,F(000)=562,R₁=0.021 0,wR₂=0.053 7(I >2σ(I))。配合物1中镍离子通过2种配体桥联成二维波浪形层状结构,而配合物2中镉离子通过2个Cl离子连接成一个双核Cd₂单元,双核单元再通过2种配体连接成一维链状结构。结果说明了金属离子在配合物组装过程中起着非常重要的作用。此外,研究了它们的荧光性质。     

两个基于双(4-吡啶-4-苯基)胺的钴(Ⅱ)、锌(Ⅱ)配合物的合成和晶体结构

以双(4-吡啶-4-苯基)胺(BPPA)和4,4-(六氟)双(苯甲酸)(H₂hfipbb)或对苯二甲酸(p-H₂bdc)为配体,采用溶剂热法与M(NO₃)₂·6H₂O(M=Co、Zn)组装合成了2个新的配合物{[Co₂(BPPA)(hfipbb)₂·(H₂O)₃]·6H₂O}_n(1)、{[Zn₂(BPPA)₂(p-bdc)₂]·H₂O·DMF}_n(2),X射线单晶衍射测定结果表明:配合物1和2均为二维结构。配合物1具有新的拓扑结构。配合物2的二维结构又可以组成三维框架结构。配合物1为正交晶系,Pnna空间群,a=2.6409(2) nm,b=1.71578(13) nm,c=1.50411(11) nm,V=6.8154(9) nm³,Z=4,μ=0.571 mm^-1,F(000)=2592,D_c=1.245 g·cm^-3,M_r=1383.76,R₁=0.0666,ωR₂=0.2089(I>2σ(I));配合物2为单斜晶系,C2/c空间群,a=2.79670(9) nm,b=1.81482(6) nm,c=2.30313(7) nm,β=102.1360(10)°,V=11.4283(6) nm³,Z=8,μ=0.906 mm^-1,F(000)=4944,D_c=1.391 g·cm^-3,M_r=1196.85,R₁=0.0398,ωR₂=0.1064(I>2σ(I))。此外,热重分析表明配合物1和2均具有良好的热稳定性。     

基于2, 5-二甲基苯-1, 4-二亚甲基二膦酸的钴、镍同构化合物的水热合成及晶体结构

在水热条件下,利用2,5-二甲基苯-1,4-二亚甲基二膦酸（H₄L）与CoCl₂·6H₂O或NiSO₄·6H₂O反应得到2个同构的过渡金属有机膦酸化合物,[Co（H₂O）₄（H₂L）]_n（1）,[Ni（H₂O）₄（H₂L）]_n（2）,并用元素分析、红外光谱、粉末及单晶X-射线等方法对其进行了表征。晶体结构分析表明：化合物1和2都属于三斜晶系,空间群为P1,化合物1的晶胞参数为a=0.4970（2）nm,b=0.7113（3）nm,c=1.1778（5）nm,α=97.779（7）°,β=92.103（7）°,γ=107.217（6）°,V=0.3927（3）nm³,Z=2;化合物2的晶胞参数为a=0.49435（19）nm,b=0.7089（3）nm,c=1.1726（5）nm,α=97.919（6）°,β=92.130（6）°,γ=107.441（5）°,V=0.3870（3）nm³,Z=2。金属离子采取了八面体构型,6个配位氧原子分别来自2个反式构型的H₂L配体和4个配位水分子。每1个金属离子与2个反式构型的H₂L配体配位形成了一维线型链状结构。这2个化合物最终通过O-H…O氢键作用形成了三维结构。此外,对2个化合物的热稳定性也进行了研究。     

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%.     

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.     

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.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

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 novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.