二苯基碘鎓镉碘[(C_6H_5)_2I~+]_2CdI_4的合成与晶体结构

用溶液挥发法合成了有机-无机杂化物1[(C_6H_5)_2I]_2CdI_4,通过X-射线单晶衍射仪进行了结构表征,并测试了其红外光谱。该化合物属于三斜晶系,P-1空间群。A=11.729(2)?,b=12.170(2)?,c=12.463(3)?,α=89.33(3)°,β=69.18(3)°,γ=68.06(3)°,V=1527.3(7)?3,Z=2。该化合物是由有机阳离子(C_6H_5)_2I~+和无机阴离子[CdI_4]_2-组成的一个零维簇结构。     

配合物[BiI3（5-NH2-phen）（DMAC）]n的合成与晶体结构

用溶液挥发法合成了一个新的配合物[Bi I3(5-NH2-phen)(DMAC)]n(phen=1,10-phenanthroline),并通过X-射线单晶衍射仪对其进行结构表征。化合物1属于单斜晶系,P21/n空间群,a=8.3181(17)?,b=17.621(4)?,c=15.374(3)?,β=96.16(3)°,V=2240.4(8)?3,Z=4。相邻的簇与簇之间通过π-π堆积和氢键作用形成二维超分子网状结构。     

5,6-二甲基-1,10-邻菲罗啉构筑的Pb/I配位化合物的合成和结构研究

采用溶液法以5,6-二甲基-1,10-邻菲罗啉为配体与碘化铅反应,合成一个1-D的有机-无机配位聚合物1[(5,6-dimethyl-phen)Pb I2]n,(phen=phenanthroline),通过X-射线单晶衍射仪测试了其晶体结构并用元素分析、红外、粉末衍射等手段进行了表征。该化合物属于单斜晶系,I2/a空间群,a=8.6061(15)?,b=12.7163(17)?,c=15.809(3)?,V=1675.6(5)?~3,Z=4。     

类金刚烷型配合物[Cd（C6H5O2N）2（H2O）]n的水热合成及其晶体结构研究

以Cd(CH3COO)2和烟酸(C6H5O2N)为原料,采用水热法合成了类金刚烷型配位聚合物[Cd(C6H5O2N)2-(H2O)]n,利用元素分析、X射线单晶衍射对其结构进行了表征。该配合物属于正交晶系,Pbca空间群,a=1.144 9(5)nm,b=1.208 3(5)nm,c=1.742 8(5)nm,α=β=γ=90°,V=2.411(16)nm3,Z=8,dc=2.064 g/cm3,μ=1.834 mm-1,F(000)=1 472,R1=0.022 6,wR2=0.041 8。     

超分子化合物(C10H10N2)Co（SCN）4的合成、晶体结构和热稳定性

在室温下合成了一个新的超分子配合物(C10H10N2)Co(SCN)4,通过元素分析、红外和单晶X-射线进行了表征。标题化合物属于正交晶系,P 21 21 2空间群,a=1.283 32(11)nm、b=1.297 53(12)nm、c=0.544 12(5)nm、V=0.906 04(14)nm3、Z=2。在化合物中,每个Co2+离子与4个SCN-的4个N原子形成变形的四面体几何构型、4,4’-联吡啶的两个氮原子双质子化,并与SCN-的S原子形成N—H…S氢键,构成一维氢键超分子链。通过热重分析研究该化合物的热稳定性。     

[（HOC2H4）2NCSS]3Cr配合物的合成及结构表征研究

合成了新型晶体配合物二羟乙基二硫代氨基甲酸铬[(HOC2H4)2NCSS]3Cr,对其结构进行解析和表征。用X-射线单晶衍射法测定了晶体的结构,结果表明配合物[(HOC2H4)2NCSS]3Cr晶体属于单斜晶系;空间群为C2/c,晶胞参数:a=17.9410(19),b=10.3755(11),c=14.4284(16),β=113.5710(10)°;晶胞参数比:a/b=1.7293,b/c=0.7191,c/a=0.8042。通过元素分析,红外光谱,紫外分析等表征手段对其结构进行分析,表明其结构均与X-射线单晶衍射法测定的晶体的结构吻合。     

三维超分子化合物[Zn(C6H4O2N)2·(H2O)4]n的水热合成及晶体结构

用2-羧基吡啶和六水合氯化锌反应制备了一种新的三维氢键超分子配合物,经X-射线衍射分析确定了单晶结构.该晶体属单斜晶系,P2(1)/n空间群,晶胞参数为a=9.836(2)(A),b=5.2256(10)(A),c=14.611(3)(A),Mr=381.64,β=90.01(3)°,V=751.0(3)(A)3,Z=2,Dc=1.688Mg·m-3,F(000)=392,μ=1.680mm-1,R=0.0258,wR=0.0612.共收集2159个衍射数据,其中1273个为独立衍射点(Rint=0.0332),可观测点数1139个(I＞2σ(I)).结果表明,在组成该超分子体系的基本结构单元[Zn(C6H4O2N)2·(H2O)4]中,Zn(Ⅱ)离子形成六配位的畸变的八面体构型,配合物单元之间通过氢键OH…O相互连接,形成了无限延伸的具有网状结构的三维超分子体系.     

一种铜配位聚合物[Cu(C_6H_4NO_2)(μ-Cl)]_n的合成、晶体结构及热稳定性

以止血环酸和2-吡啶甲醛为反应底物,采用溶剂热法,合成了一种新颖的配位聚合物[Cu(C6H4NO2)(μ-Cl)]n(C6H4NO2H=2-吡啶甲酸)。利用红外光谱、X-射线单晶衍射、热重分析对配合物结构进行了表征。结果表明:配位聚合物为四方晶系,空间群为P 42/n,晶胞参数:a=9.774(4)?,b=9.774(4)?,c=15.029(6)?,V=1435.7(11)?3,Z=16。在配位聚合物中,每个Cu2+离子与来自两个2-吡啶甲酸的3个O原子和1个N原子及2个Cl原子配位形成畸变的八面体构型。此外,每2个Cu2+通过2个Cl原子桥联形成二维网格状结构,层与层之间又通过π-π堆积和氢键作用,把二维网格状结构进一步堆积成三维超分子结构,从而更加稳定了晶体结构。     

Waugh型化合物（C7H7N2）5Mn0.5（H2O）2[MnMo9O32]·10H2O的合成、表征及晶体结构

以(NH4)6MnMo9O32.6H2O和苯并咪唑为原料,采用常规的水溶液法合成了Waugh型钼酸盐(C7H7N2)5Mn0.5(H2O)2[MnMo9O32].10H2O,并对其进行了单晶结构测定、红外光谱、固体紫外可见漫反射光谱及热重分析。晶体学参数为:单斜晶系,P2(1)/c空间群,a=10.813(6),b=15.848(9),c=36.395(2),β=95.143(10)°,V=6211.8.5(6)3,Z=2,Dc=9.841 g.cm-3,R1=0.0455,wR2=0.1005(I>2σ),GOF=1.032。     

新型镍配合物[Ni(C14H12N2)（H2O）（HCO2）2]·H2O合成及结构

溶解2,9’-二甲基邻菲咯啉的15ml乙醇水溶液中(v/v=2:1)加入新制备NiCO3沉淀,搅拌下再滴加入1.0mol/L的甲酸液,该溶液室温下静置缓慢蒸发5天,得到绿色块状的[Ni(C14H12N2)(H2O)(HCO2)2].H2O晶体。单晶X-射线衍射分析表明,该配合物晶体属三斜晶系,P-1空间群,晶胞参数为:a=7.399(2),b=10.373(2),c=11.442(2),α=82.42(3)°,β=81.77(3)°,γ=76.10(3)°,V=839.3(3)3,Z=2,C16H18NiN2O6,Mr=393.01。最后残差因子R1=0.0353,wR2=0.0835。中心金属离子Ni与邻菲咯啉配体的2个N原子及一个甲酸根中的2个O原子螯合形成八面体赤道面,轴向与结晶H2O与另一个甲酸根中的2个O原子与形成NiN2O4畸变八面体配位结构。     

Enhanced one-step purification of C2H4 from C2H2/C2H4/C2H6 mixtures by fluorinated Zr-MOF

The extraction of C₂H₄ from C₂H₆/C₂H₄/C₂H₂ mixtures is of great significance in the chemical industry for C₂H₄ production but the process remains challenging due to the similarity of these C₂ hydrocarbon species in their molecular size and physical properties. Here, we report the fluorination of a stable Zr-MOF, UiO-66, to fine-tune the pore dimensions and pore functionality. In particular, UiO-66-CF₃ shows notably preferential adsorption of C₂H₆ and C₂H₂ over C₂H₄, with C₂H₂/C₂H₄ and C₂H₆/C₂H₄ selectivities of 1.4 and 1.9, respectively. Theoretical calculations provide insight into the binding sites of UiO-66-CF₃ for C₂ hydrocarbon adsorption. Breakthrough experiments further confirmed the capability of the material for purification of C₂H₄ from C₂H₂/C₂H₄/C₂H₆ ternary mixtures, evidenced by the high purity C₂H₄ (99.9%+) obtained directly from outlet gas.     

Stable mixed metal-organic framework for efficient C2H6/C2H4 separation

In view of lacking efficient ethane-selective adsorbent for ethane/ethylene separation, a highly stable microporous mixed metal-organic framework, termed as MUV-10(Mn), was synthesized by the solvothermal method and it could efficiently separate C₂H₆/C₂H₄ mixture. The structure and morphology of synthesized material was confirmed by XRD, SEM, TGA and BET, etc. Selectivity and corresponding adsorption heat of C₂H₆ and C₂H₄ were calculated based on single component adsorption results measured in details. The results show that MUV-10(Mn) features C₂H₆/C₂H₄ selectivity about 1.42 and can absorb more C₂H₆ than C₂H₄ at room temperature. And it has high acid, alkali and water vapor stability. Addtionally, dynamic breakthrough experiment showed MUV-10(Mn) could extracted low concentration of C₂H₆ from C₂H₆/C₂H₄ mixture (V_{{\mathrm{C}}_{\mathrm{2}}{\mathrm{H}}_{\mathrm{6}}}\text{?}/\text{?}{V}_{{\mathrm{C}}_{\mathrm{2}}{\mathrm{H}}_{\mathrm{4}}}=1∶9 and 1∶15) to collect C₂H₄ gas with high purity, which indicates the promising future of MUV-10(Mn) in C₂H₄ purification.     

高稳定双金属MOF材料用于低浓度乙烷的高效分离

针对乙烷/乙烯分离过程中,缺乏高效稳定的乙烷选择吸附剂,采用溶剂热法合成了一种具有高稳定性的双金属微孔MOF材料MUV-10(Mn),通过吸附分离的方式,实现了乙烯中低浓度乙烷的高效分离。采用XRD、SEM、TGA、比表面分析等表征手段对所制备材料的结构及形貌进行了确认和分析,详细测试了MUV-10(Mn)对乙烷和乙烯单组分气体的吸附性能,并进行了选择性和吸附热的计算。结果表明,MUV-10(Mn)在室温下的乙烷吸附量高于乙烯对于乙烷/乙烯混合气的选择性为1.42,且具有高的酸、碱和水蒸气稳定性。混合气体穿透实验表明,MUV-10(Mn)能够高效去除乙烯中的低浓度乙烷,得到高纯乙烯气体,在乙烯提纯方面显示出良好的应用前景。     

Study of the preparation of bulk tungsten carbide catalysts with C2H6/H2 and C2H4/H2 carburizing mixtures

The influence of the preparation procedure of tungsten carbide on the mechanism of carburization is discussed. This work is focused on the reduction and the carburization of tungsten trioxide by a mixture of hydrocarbon and H₂ to form WC. Temperature-programmed reaction spectra obtained with CH₄, C₂H₆ and C₂H₄ have been measured. In presence of the CH₄-H₂ mixture, H₂ is the reducing agent and the hydrocarbon is consumed for the carburization whereas C₂H₆ or C₂H₄ participates in the reduction of the tungsten oxide. The temperatures of reduction and carburization are lower by about 150 K using C₂H₆ or C₂H₄ instead of CH₄. Such a decrease of the temperature of reduction of tungsten oxide is needed to avoid the formation of poorly reducible compounds that can occur during the preparation of supported tungsten carbide. Furthermore, the surface area of the resulting carbide is 25 m²/g with C₂H₆ and C₂H₄ and 10 m²/g with CH₄. During the carburization, the deposit of excess carbon on the WC surface is larger with the C₂ hydrocarbons than with CH₄, but it protects the carbide and can be removed by hydrogen treatment. This revised version was published online in July 2006 with corrections to the Cover Date.     

Boosting C2H6/C2H4 separation in scalable metal-organic frameworks through pore engineering

The development of ethane (C₂H₆)-selective adsorbents for ethylene (C₂H₄) purification, although challenging, is of prime industrial importance. Pillared-layer metal-organic frameworks (MOFs) possess facilely tunable pore structure and functionality, which means they have excellent potential for high-performance C₂H₆/C₂H₄ separation applications. Herein, we report a family of isostructural pillared-layer MOFs with various metal centers M and co-ligands L, M₂(D-cam)₄L₂ (denoted M-cam-L; M = Cu, Co, Ni; L = pyz, apyz, dabco), with a variety of pore surface properties. All of the M-cam-L materials exhibit preferential adsorption for C₂H₆ over C₂H₄. In particular, Ni-cam-pyz exhibits the highest C₂H₆ capture capacity (68.75 cm³ g⁻¹ at 1 bar and 298 K), Cu-cam-dabco possesses the greatest C₂H₆/C₂H₄ adsorption selectivity (2.3), and the lowest isosteric heat of adsorption is demonstrated for Cu-cam-pyz (20.1 kJ mol⁻¹). Dynamic column breakthrough experiments also confirmed the excellent separation performance of M-cam-pyz and M-cam-dabco materials. The synthesis route of the M-cam-L materials is easily scaled-up under laboratory conditions, and hence this class of MOFs is promising for practical C₂H₄ purification.     

CH4, C2H6, and C2H4 Phase Equilibria on SAPO-34 Using the Vacancy Solution Theory

Adsorption data of single, binary, and ternary mixtures of methane, ethane, and ethylene on Silicoalumina-Phosphate molecular Sieve (SAPO-34) were obtained experimentally in the pressure range of 0 to 600 kPa at 303, 313, and 323 K. The adsorbed equilibrium concentration was predicted based on the vacancy solution theory (VST) using excess Gibbs energy (EGE) models of activity coefficients. EGE models were studied comparatively, i.e., the Wilson, Flory Huggins, and NRTL equations. The VSM-model results were compared with the mixture adsorption data. The results revealed higher capability of EGE models against the extended Langmuir equation in predicting adsorption behavior of the so-called gas mixture.     

Boosting selective C2H2/CH4, C2H4/CH4 and CO2/CH4 adsorption performance via 1,2,3-triazole functionalized triazine-based porous organic polymers

Nitrogen-rich porous organic polymers have shown great potentials in gas adsorption/separation, photocatalysis, electrochemistry, sensing and so on. Herein, 1,2,3-triazole functionalized triazine-based porous organic polymers (TT-POPs) have been synthesized by the copper-catalyzed azide-alkyne cycloaddition (Cu-AAC) polymerization reactions of 1,3,5-tris(4-azidophenyl)-triazine with 1,4-diacetylene benzene and 1,3,5-triacetylenebenzene, respectively. The characterizations of N₂ adsorption at 77 K show TT-POPs possess permanent porosity with BET surface areas of 666 m²·g^-1 (TT-POP-1) and 406 m²·g^-1 (TT-POP-2). The adsorption capacities of TT-POPs for CO₂, CH₄, C₂H₂ and C₂H₄, as well as the selective separation abilities of CO₂/N₂, CO₂/CH₄, C₂H₂/CH₄ and C₂H₄/CH₄ were evaluated. The gas selective separation ratio of TT-POPs was calculated by the ideal adsorbed solution theory (IAST) method, wherein the selective separation ratios of C₂H₂/CH₄ and C₂H₄/CH₄ of TT-POP-2 was 48.4 and 13.6 (298 K, 0.1 MPa), which is comparable to other adsorbents (5.6-120.6 for C₂H₂/CH₄, 10-26 for C₂H₄/CH₄). This work shows that the 1,2,3-triazole functionalized triazine-based porous organic polymer has a good application prospect in natural gas purification.     

[(C_2H_5)_4N]_2｛Fe_4S_4[S_2CN(C_2H_5)_2]_4｝的晶体和分子结构

本文报导含类立方烷型簇核Ｆｅ４ｓ４的金硫配位化合物［（Ｃ２Ｈ５）４Ｎ］２｛Ｆｅ４Ｓ４［Ｓ２ＣＮ（Ｃ２Ｈ５）２］４｝的合成、晶体和分子结构测定的结果。