柔性多羧酸配体锶配合物的合成、晶体结构及拓扑学分析

利用水热合成制备了一个新颖的基于柔性多羧酸配体的碱土金属配合物Sr(BuTA)_0.5(H₂O)₂(1)(H₄BuTA=1,2,3,4-丁四酸)。利用元素分析及X-射线单晶衍射对其进行了表征。结构分析结果表明标题化合物1属于单斜晶系,P2₁/c空间群,晶胞参数为a=0.870 03(5) nm,b=0.793 03(5) nm,c=1.268 07(5) nm,β=127.689(3)°,晶胞体积V=0.692 36(7) nm³,Z=4,D_calc=2.290 g·cm^-3,F(000)=468,μ=7.768 cm^-1,R=0.015 8,wR=0.037 7。在化合物1中,每个Sr(Ⅱ)的配位环境为八配位的反四棱柱配位构型。在配合物中金属和配体互相连接形成一个三维的框架结构,其拓扑为(4⁶)₂(4¹².6¹².8⁴)。在其结构中配体是少见的八连接点。对配合物1的热稳定性也做了测试。     

二维镉配位聚合物[Cd(nip)(bix)0.5H2O]n构筑的新型(3，5，5)连接的三维氢键超分子体系

在水热条件下合成了一个新颖的配位聚合物[Cd(nip)(bix)_0.5H₂O]_n (1) (nip=5-硝基间苯二甲酸,bix=1,4-(二亚甲基)二咪唑)。单晶X-射线衍射分析表明,晶体属三斜晶系,P1 空间群,晶胞参数a=0.827 1(2) nm,b=1.016 5(3) nm,c=1.147 4(3) nm,α=70.862(4)°,β=68.988(4)°,γ=69.001(4)°。V=0.818 4(4)nm³,Z=2,D_c=1.861g·cm^-3,μ=1.380 mm^-1,F(000)=454,最终的R₁=0.040 0,wR₂=0.090 1。配合物1中,nip^2-离子以μ₃桥联的方式连接Cd(Ⅱ)中心形成含有交替8元环和16元环的一维聚合链,进而,bix配体柱撑一维链形成了(3,4)-连接的二维配位网;最后,通过R²₂(6)氢键环的作用,二维网拓展为具有(3,5,5)-连接{3.4.5}{3.4².5.6⁴.7.8} {3.4³.5².6².7²}拓扑结构的三维超分子体系。此外,本文还研究了配合物1的热稳定性和荧光性质。     

簇合物Co3(CO)7(μ3-S)[μ,η2-CNP(S)(C6H4OCH3)OC(Ph)CH]和Co3(CO)7(μ3-S)[μ,η2-SCNC(CH3)2P(S)(Cl)N(Ph)]的合成与晶体结构

用Co₂(CO)₈分别与两个杂环配体C(S)NHP(S)(C₆H₄OCH₃)OC(Ph)CH (L₁)和C(S)NHC(CH₃)₂P(S)(Cl)N(Ph) (L₂)反应,合成两个新的三核钴羰基硫簇合物Co₃(CO)₇(μ₃-S)[μ,η²-CNP(S)(C₆H₄OCH₃)OC(Ph)CH](Ⅰ)和Co₃(CO)₇(μ₃-S)[μ,η²-SCNC(CH₃)₂P(S)(Cl)N(Ph)](Ⅱ)。用元素分析,IR, ¹H NMR, ³¹P NMR及MS谱表征了它们的结构,同时用X射线衍射法测定了它们的晶体分子结构,二者属于三斜晶系,空间群P1,Ⅰ的晶胞参数为:a=0.84768(1)nm,b=1.19049(3)nm,c=1.43639(1)nm,α=86.926(1)°,β=81.601(3)°,γ=88.535(2)°,V=1.4318(5)nm³,Z=2,D_c=1.641g·cm^-3,F(000)=716,μ=1.893mm^-1,R=0.0602,R_w=0.1515。Ⅱ的晶胞参数为:a=1.2050(2)nm,b=1.2448(2)nm,c=0.8951(2)nm,α=97.49(1)°,β=93.552(4)°,γ=108.432(3)°,V=1.2554(3)nm³,Z=2,D_c=1.841g·cm^-3,F(000)=690,μ=2.419mm^-1,R=0.0423,R_w=0.1075。Ⅰ和Ⅱ的分子骨架Co3S为三角锥构型,S作为面桥基配体,所有CO作为端基配体与三个Co原子成键。Ⅰ中含有CoCoCN四元环组件,Ⅱ中含有CoCoSCN五元环组件。     

两例弯曲型二酸Zn(Ⅱ)、Cd(Ⅱ)配合物的合成，结构与荧光性质

本文以弯曲型二酸2,2′-azanediyldibenzoic acid(H₂L)为配体，溶液法合成了2个新的配合物[Zn₂(L)₂(H₂O)₂]·H₂O (1)和[(NH₄)₂ Cd(L)₂]·C₂H₅OH (2)。通过X射线单晶衍射分别测定了他们的结构：配合物1属于单斜晶系，空间群为P2₁/c，a=1.487 9(2) nm，b=0.898 9(1) nm，c=1.210 0(2) nm，β=99.211(2)°，V=1.597 3(3) nm³。配体L的羧酸根均为单齿配位，桥连2个锌离子，形成一个零维的[2+2]扭曲环状结构，并由氢键作用连接成二维结构。配合物2属于正交晶系，空间群为Pbcn，a=2.060 2(2) nm，b=1.281 9(1) nm，c=2.246 1(1) nm，V=5.931 9(6) nm³。Cd(Ⅱ)取较少见的羧酸根螯合八配位结构，L与Cd(Ⅱ)也形成了二核环状结构，并通过共用1个镉离子而形成一维的阴离子链，抗衡阳离子为NH₄⁺。链间通过π…π作用堆积成三维结构。此外，还并测定了配体及配合物的荧光性质。     

DBBD及其Cu(I)配位聚合物[CuI(DBBD)2]n的合成

In this article we report the synthesis of (R,S)-4,4′-biquinoline-6,6′-dimethyl-3,3′-dicarboxylate (DBBD) (1) and the formation of copper(I) coordination polymer [CuI(DBBD)₂]_n (2) by inducing a bidentate organic ligand (DBBD). The crystal 1 belongs to monoclinic system with space group P2₁, and a=0.881 30(19) nm, b=1.966 0(6) nm, c=1.478 1(4) nm, β=119.429(12)°, V=2.230 5(10) nm³, D_c=1.276 g·cm^-3. The crystal 2 belongs to orthogonal system with space group Fmm2, and a=2.044 41(17) nm, b=1.543 06(13) nm, c=1.652 45(13) nm, V=5.212 9(7) nm³, D_c=1.669 g·cm^-3, Z=8. CCDC: 292931, 1; 292934, 2.     

二个含N-取代水杨基Schiff碱配体的镍配合物的合成和晶体结构

合成了二个N-取代水杨基Schiff碱的Ni(Ⅱ)配合物[Ni₂(dsh)(C₅H₅N)₆]·2C₅H₅N (H₄dsh=1，2-disalicyloylhydrazine) (1)和Ni(spmbh)(C₅H₅N) (H₂spmbh=N-salicylaldehyde-N-(4-methoxybenzoyl) hydrazone) (2)。化合物1：单斜晶系，P2₁/c空间群，a=1.274 74(5) nm，b=1.646 31(7) nm，c=1.199 59(5) nm，β=103.344(1)°，V=2.449 5(2) nm³，Z=2，D_c=1.381 g·cm^-3，M_r=1 018.44，μ=0.826 mm^-1，F(000)=1 060，R=0.033 1，wR=0.073 3；化合物2：单斜晶系，P2₁/c空间群，a=1.096 74(8) nm，b=0.946 44(6) nm，c=1.725 7(1) nm，β=91.006(4)°，V=1.791 0(2) nm³，Z=4，D_c=1.506 g·cm^-3，M_r=406.08，μ=1.109 mm^-1，F(000)=840，R=0.031 7，wR=0.049 0。具有晶体学中心对称性的双核镍化合物1中，1，2-二水杨酰基肼通过肼基N-N单键桥联二个Ni(Ⅱ)原子，Ni…Ni原子间距为0.468 83(4) nm，每个Ni(Ⅱ)原子具有轴向伸长的八面体配位构型。化合物2中，Ni(Ⅱ)原子具有平面正方形的配位构型。     

基于烟酰腙Schiff碱的Cu(Ⅱ)和Ni(Ⅱ)配合物的合成、晶体结构和性质

采用缓慢挥发法合成了2个烟酰腙类Schiff碱配合物[Cu(Py)(HL¹)]₂ (1)和[Ni(L²)₂] (2), 其中, H₃L¹=2, 4-二羟基苯甲醛缩烟酰腙, HL₂=2-乙酰基吡啶缩烟酰腙。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和2的晶体均属单斜晶系, P2₁/c空间群;1的晶胞参数a=0.739 86(12) nm, b=1.903 7(3) nm, c=1.154 86(19) nm, β=105.090(3)°, V=1.570 5(4) nm³;该化合物是中心对称的双核配合物, 每个Cu(Ⅱ)离子都处于畸变四方锥配位环境;结构基 元通过π-π相互作用和O-H…N氢键形成三维超分子。2的晶胞参数a=2.034 0(5) nm, b=1.183 2(3) nm, c=1.020 7(3) nm, V=2.456 1(11) nm³;中心离子Ni(Ⅱ)的配位数为6, 它处于畸变八面体配位环境。配合物有很高的热稳定性, 分解温度分别为315 ℃ (1)和358 ℃ (2)。     

锡(Ⅳ)N,N-二取代荒酸配合物Ph3SnS2CN(CH3)C6H5、 Ph3SnS2CN(C4H8NH)和SnCl2(S2CNEt2)2的合成、表征及晶体结构

Three tin (Ⅳ) complexes with N,N-dialkyl dithiocarbamates Ph₃SnS₂CN(CH₃)C₆H₅ (1),Ph₃SnS₂CN(C₄H₈NH) (2) and Sn(Cl)₂(S₂CNEt₂)₂ (3) have been synthesized. The crystal structures have been determined by X-ray sin- gle crystal diffraction. A crystal of the complex 1 is triclinic with space group P1, a=0.9485(3)nm, b=1.0491(3)nm, c=1.3631(4)nm, α=70.996(4)°, β=72.294(4)°, γ=79.609(4)°, Z=2, V=1.2168(6)nm³, D_c=1.453g·cm^-3, μ=1.234mm^-1, R=0.0442, wR=0.0858. A crystal of the complex 2 is monoclinic with space group P2(1)/c, a=1.2214(2)nm, b=1.1651(2)nm, c=1.5769(3)nm,β=99.039(2)°, Z=2, V=2.2162(7)nm³, D_c=1.532g·cm^-3, μ=1.352mm^-1, R=0.0267, wR=0.0591. A crystal of the complex 3 is triclinic with space group P1, a=0.7179(2)nm, b=0.9256(3)nm, c=1.5327(5)nm,α=93.857(4)°,β=98.992(4)°, γ=109.481(4)°, Z=2, V=0.9405(5)nm³, D_c=1.717g·cm^-3, μ=2.076mm^-1, R=0.0263, wR=0.0662. In the complexes 1 and 2 the tin atoms rendered five-coordination in a distorted tigonal bipyramidal structure and in the complex 3 the tin atom rendered six-coordination in a distorted octahedron structure. CCDC: 1, 179918; 2, 180024; 3, 180004.     

基于刚性四面体含硅配体构筑的两个钴配位聚合物及其结构多样性

基于四齿刚性羧酸配体H₄L(H₄L=4,4',4",4"'-silanetetrayltetrabenzoic acid)在水热条件下合成了2个微孔配位聚合物,分别是[CoL][NH₂(CH₃)₂]₂·2.25H₂O(1)和[Co₃L₂]H₃O]₂·4DMA(2)(DMA=N,N-二甲基乙酰胺)。晶体结构分析表明这2个化合物均属于正交晶系,晶体1的空间群是Pbca,晶胞参数是a=2.2702(2)nm,b=1.4565(7)nm,c=2.8264(7)nm,晶体2的空间群是Pnna,晶胞参数是a=2.6982(3)nm,b=2.1882(2)nm,c=1.3821(9)nm。化合物1是由四面体型的单核钴和4-连接的配体构成的sra拓扑的三维结构。化合物2是由三核钴{Co₃(COO)₈}和4-连接的四面体型配体构成的、带有一维孔道的双节点(4,8)-连接的alb三维网络结构。讨论了由H₄L构成的配位聚合物的结构多样性。     

不对称Fe-Fe双金属化合物[Cp*Fe(dppe)(C≡CFc))[PF6]n(n=0，1)的合成、结构及光谱性质的研究(英)

A biased bimetallic Fe-Fe complex Cp^*Fe(dppe)(C≡CFc) (1) was synthesized from FcC≡CH (Fc=C₅H₄FeC₅H₅) and Cp^*Fe(dppe)Cl (Cp^*=C₅Me₅). Its one-electron oxidation species [Cp^*Fe(dppe)(C≡CFc)][PF₆] (1a) was also prepared and the spectroscopic properties of 1a was studied. The single-crystal X-ray diffraction analysis of 1 shows that ferrocenylacetylene is bonded at the terminal carbon to the iron center in the Cp^*Fe(dppe) part. Crystallographic data for 1: monoclinic, space group C2/c, with a=4.067 65(14) nm, b=1.260 74(4) nm, c=1.649 89(5) nm, β=104.387(10)°, V=8.195 7(5) nm³, Z=8, D_c=1.354 g·cm^-3, F(000)=3512, μ=0.822 mm^-1. The structure was refined to R₁=0.038 4, wR₂=0.100 0. CCDC: 234893.     

Solvent extraction separation of In/III/-Tl/III/ and Hg/II/-Cd/II/-Co/II/ with sulphoxides

Solvent extraction studies have been made on some metals: In/III/-Tl/III/ and Hg/II/-Cd/II/-Co/II/, from ammonium thiocyanate solutions by dialkyl sulphoxides. Separation of these metals from one another can be achieved by suitable choice of the extracted conditions. The nature of the extractable metal species has been elucidated.     

Synthesis of chlorobis/β-diketonato/oxotechnetium/V/ and tris/β-diketonato/technetium/III/ complexes

Chlorobis/-diketonato/ oxotechnetium/V/ complexes [TcOCl/-dik/₂, -diketone=acetylacetone, benzoylacetone and dibenzoylmethane] were newly synthesized using macroamount of⁹⁹Tc. These complexes were further separated into geometrical isomers. Furthermore, an improvement of the yields for the syntheses of tris/-dike-tonato/technetium/III/ complexes [Tc/-dik/₃, -diketone=acetylacetone, benzoylacetone and 2-thenoyltrifluoroacetone] was examined using Tc/III/-thiourea complexes as a starting material.     

Crystal structure of Na3PO4 · 12H2O

The crystal structure of trisodium monophosphate hemihydrate was determined. The space group is $\text{C2}\text{c}$ and a unit cell contains eight formula units. The unit cell dimensions of $\text{Na}{}_3\text{PO}{}_4\text{·}\text{1}\text{2}\text{H}{}_2\text{O}$ are a = 9.631(3), b = 5.416(2), c = 16.938(8) Å, β = 102.60(5)°. The final R value is 0.027 for a set of 1430 independent reflections. This atomic arrangement is mainly a three-dimensional network of distorted NaO₆ octahedra. The hydrogen bonding scheme is given.     

Simultaneous propane dehydrogenation andco2hydrogenation overCrOx/SiO2catalyst

Summary Single reverse water-gas shift (RWGS) and dehydrogenation of propane with CO₂(DH-CO₂) reactions in the presence and absence of the CrO_x/SiO₂ catalyst have been studied between 673 and 873 K. It was found that the CrO_x/SiO₂ catalyst is active both in the dehydrogenation of propane and in the RWGS reactions. The obtained results suggest that the dehydrogenation of propane to propene in the presence of CO₂on CrO_x/SiO₂can be facilitated by the RWGS reaction.</o:p>     

Direct synthesis of dimethyl carbonate ?from CH3OH AND CO2 by H3PW12O40/CexTi1-xO2 catalyst

Summary Ce_xTi_1-xO₂ and H₃PW₁₂O₄₀/Ce_xTi_1-xO₂ catalysts were prepared using a sol-gel method, and applied to the direct synthesis of dimethyl carbonate from methanol and carbon dioxide. H₃PW₁₂O₄₀/Ce_xTi_1-xO₂ showed a better catalytic performance than the corresponding Ce_xTi_1-xO₂, due to the bifunctional catalysis of Br?nsted acid sites (provided by H₃PW₁₂O₄₀) and base sites (provided by Ce_xTi_1-xO₂). H₃PW₁₂O₄₀/Ce_0.1Ti_0.9O₂ showed the highest catalytic performance among the H₃PW₁₂O₄₀/Ce_xTi_1-xO₂ catalysts.     

Oxygen defect K2NiF4-type oxides: The compounds La2−xSrxCuO4−x2+δ

Oxygen defect K₂NiF₄-type oxides $\text{La}{}_{\mathrm{2?x}}\text{Sr}{}_{\mathrm{x}}\text{CuO}{}_{\mathrm{<mtext>4?</mtext><mtext>x</mtext><mtext>2</mtext><mtext>+\delta </mtext>}}$ have been synthesized for a wide composition range: 0 ≤ x ≤ 1.34. From the X-ray and electron diffraction study three domains have been characterized: orthorhombic compounds with La₂CuO₄ structure for 0 ≤ x < 0.10, tetragonal oxides similar to LaSrCuO₄ for 0.10 ≤ x < 1 and several superstructures derived from the tetragonal cell ( with n = 3, 4, 4.5, 5, 6) for 1 ≤ x ≤ 1.34. The compounds corresponding to 0 < x < 1 differ from the other oxides in that they are characterized by the presence of copper with two oxidation states: + 2 and + 3. A model structure for La_0.8Sr_1.2CuλO_3.4, in which copper has only the + 2 oxidation state, and for which the actual cell is tegragonal—a = 18.80₄ Å and c = 12.94 Å—has been established. The particular structural evolution of these compounds is discussed in terms of a competition between the capability of Cu(II) to be oxidized to Cu(III) and the ordering of oxygen vacancies.     

An investigation of the promotional effect of propylene or propane traces on the activity of sulfatedPt/g-Al2O3andPt-Sn/g-Al2O3inCH4combustion

Summary A strong promoting effect of the presence of C₃H₈or C₃H₆was determined for the combustion of CH₄in excess oxygen, over pre-sulfated 1%Pt/g-Al₂O₃and pre-sulfated 1%Pt-2%Sn/g-Al₂O₃catalysts.</o:p>     

A study of the spinel materials LiTi2O4 and Li43Ti53O4 by photoelectron spectroscopy

HeI-excited valence-band ultraviolet photoelectron spectra and MgKα-excited Ti-2p X-ray photoelectron spectra are reported for the spinel materials LiTi₂O₄ and $\text{Li}{}_{\mathrm{<mtext>4</mtext><mtext>3</mtext>}}\text{Ti}{}_{\mathrm{<mtext>5</mtext><mtext>3</mtext>}}\text{O}{}_4$. The presence of a Fermi edge in the ultraviolet photoelectron spectrum of LiTi₂O₄ confirms the metallic nature of this material, although the measured density of states at the Fermi energy is much lower than that expected from an independent-electron interpretation of the magnetic susceptibility. This difference is attributed to a strong interaction of the conduction electrons with the lattice vibrations. The localization of conduction electrons that occurs in the final state in the Ti-2p X-ray photoelectron spectrum of LiTi₂O₄ is attributed to a Coulomb interaction with a core hole.     

Synthesis and characterization of Ti1−2xNbxNixO2−x/2 solid solutions

Doped-rutile has been traditionally used in ceramic pigments for its intense optical properties. In this paper, we compare the classical ceramic synthesis of Ti_1−2xNb_xNi_xO_2−x/2 system with the sol-gel methodology, which allows a reduction of the anatase-rutile transformation temperature. The composition was optimised in order to obtain a unique rutile phase with the minimum amount of pollutant Ni(II) and enhanced chromatic coordinates. Incorporation of the doping ions in the rutile structure was corroborated by XRD and Rietveld refinements. The species responsible for the colour mechanism were studied by different techniques. UV-VIS spectroscopy showed the characteristic features of Ni²⁺ ions, whose existence was corroborated by EPR and magnetic measurements. From these results, (Ni,Nb)doped-TiO₂ powder samples can be now shaped as thin films, monoliths, etc. by using sol-gel methodology without modifying their properties. This study introduces new possibilities of coloured TiO₂-based solid solutions in new combined advanced applications (colouring agent and photocatalyst, etc.).     

LixNi0.8-yCo0.2ZnyOp的合成及电化学性能研究

A series of single-phase Li_xNi_0.8-yCo_0.2Zn_yO_p(0.96 ≤x≤ 1.10， 0 ≤y≤ 0.05， 2 ≤p≤ 2(1+y) ) (different in the y values) were synthesized by a two-step solid state reaction method， in which LiOH·H₂O， Zn-doped spherical Ni(OH)₂ and Co₂O₃ were used as the precursors. The ICP-AES analyses proved that the Zn-doped compounds synthesized had the nonstoichiometric form. The results of the XRD， SEM identified that the uniform particles of the as-prepared materials having a good layered structure were fine， narrowly distributed and well crystallized. The electrochemical performance test was carried out and the results showed that the as-prepared Zn-doped materials had not only a high capacity， but also a better cycling stability characterization than the un-doped one. The Li_1.06Ni_0.75Co_0.22Zn_0.03O_2.03 material has an initial reversible capacity as high as 160.5mAh·g^-1; and a first discharge efficiency 89.2%， and exhibits satisfactory cyclic stability with 90% retainable capacity after 50 cycles.