具有新颖结构的亚磷酸锌化合物的水热合成与表征

在水热体系中以二乙烯三胺为模板剂合成了结构新颖的亚磷酸锌化合物Zn(DETA)Zn₂(HPO₃)₃.单晶X射线衍射分析结果表明,该化合物属正交晶系,Cmca空间群,晶胞参数a=1.889 25(1)nm,b=1.001 04(5)nm,c=1.630 32(8)nm,β=90°,V=3.083 3(3)nm3,Z=4,DC=1.162 Mg.m^-3,最终因子R1[I>2σ(I)]=0.068 5,wR₂[I>2σ(I)]=0.160 5.该化合物的结构中含有{ZnO₄},{ZnO₂N₃}和{HPO₃}基本结构单元,其中{ZnO₄}和{HPO₃}通过桥氧原子共顶点相互交替连接形成具有4-,8-和12-元环的无限延伸的二维层.有趣的是,{ZnO₂N₃}结构单元以二聚体形式{ZnODETA}₂悬挂在12-元环孔道中,这种结构在亚磷酸锌中鲜有报道.     

新型Ce3+掺杂亚磷酸锰开放骨架材料的合成与荧光性质

通过高通量实验方法制备了一系列新型的Ce³⁺离子掺杂亚磷酸锰(NH₄)₄[Mn_4-xCe_x(HPO₃)₆](简称JIS-10∶xCe³⁺) 无机开放骨架材料. 通过粉末X射线衍射(PXRD)谱图、 扫描电子显微镜(SEM)、 微量元素能谱(EDS)、 X射线光电子能谱(XPS)、 傅里叶变换红外(FTIR)光谱和光致发光(PL)光谱等手段对该材料进行了表征, 并研究了Ce³⁺离子掺杂浓度、 反应温度和时间对晶体相变和发光性能的影响. 结果表明, 在波长260 nm的光激发下, Ce³⁺离子在500 nm处有1个绿光发射带而Mn²⁺离子在590 nm处有1个黄光发射带. 调变JIS-10∶xCe³⁺材料中Ce³⁺离子的掺杂浓度发现, 当x=0.06^{时, 即Ce3+离子的掺杂浓度较低时, 样品的发射颜色为黄绿色, 其CIE坐标为(0.38, 0.48); 当Ce3+离子的掺杂浓度增加时, 绿色发光带的增长快于黄色发光带的增长, 从而调整发射颜色; 在x=1.33时观察到最强的发射, 浓度过高发生浓度猝灭.}     

A New Non-centrosymmetric Microporous Fluorinated Iron Phosphate: Structural Elucidation,Spectroscopic Study and Hirshfeld Surface Analysis

The crystal structure of a new non-centrosymmetric microporous fluorinated iron phosphate, (H₃O)₂[Fe₄(H₂O)₂F₄(PO₄)₂(HPO₄)₂](H₂O), was determined by single crystal X-ray diffraction analysis and the result reveals that it belongs to the orthorhombic system with four molecules in the unit cell(space group P2₁2₁2₁). Thus, the complex was characterized by powder X-ray diffraction, spectroscopic techniques(Fourier transform infrared and Fourier transform Raman) and ¹⁹F MAS NMR. The elemental analysis of the sample was also carried out. The chiral inorganic sheets, which stacked along[100] showed the presence of FeF₂O₄ as well as FeF₂O₃H₂O octahedra, PO₄ besides HPO₄ tetrahedra, hydronium ions(H₃O⁺) and isolated water molecules. Hirshfeld surface analysis, especially d_nom surface and fingerprint plots, were used for decoding the intermolecular interactions in the crystal network and the contribution of component units for the construction of the 3D architecture. From the Hirshfeld surfaces and 2D fingerprint analysis, it was found that the subtle interactions, such as H…H associating the third intense interaction of all intercontacts, provide extra stabilization in addition to the presence of the strong hydrogen bonds mentioned above.     

Solvothermal Preparation of Mn3O4 Nanoparticles and Effect of Temperature on Particle Size

Hausmannite Mn₃O₄ nanoparticles were successfully prepared via a facile one-step solvothermal route with Mn(CH₃COO)₂·4H₂O as manganese source in the mixed solvent of acetone and water. Powder X-ray diffraction(XRD), Fourier transform infrared(FTIR) spectrometry and transmission electron microscopy(TEM) were used to characterize Mn₃O₄ nanoparticles. It was found that the particle size could be tailored by varying the synthesis temperature. On the whole, the particle size becomes larger with the rising of solvothermal reaction temperature. But there is no linear relation between them. According to the different temperatures(60-140℃), the average particle size is from about 9 nm to 15 nm. Magnetic properties of Mn₃O₄ samples prepared at 60, 100 and 140℃ were studied via a superconducting quantum interference device(SQUID), respectively.     

三碘-氯化四-(4-三甲基苯胺基)卟啉-羟基-水合锰水合物的合成与晶体结构

报道了标题化合物([Mn(Ⅲ)OH·H₂O·TMAP]·I₃·Cl·9H₂O)的合成和晶体结构。晶体属P2_1/a空间群,a=1.8502(1)nm,b=1.2738(1)nm,c=3.0458(2)nm,β=104.52(4)°,Z=4,R=0.096,R_w=0.087.用顺磁和光谱电化学证明卟啉配合物中心锰为三价,确定了锰卟啉轴向两个配位氧原子,一个属水分子,另一个属氢氧根。讨论了锰卟啉的稳定氧化态。     

亚磷酸锌无机-有机杂化化合物的合成与结构表征

在水热条件下, 以1,6-己二胺为模板剂合成了一个三维(3D)亚磷酸锌无机-有机杂化化合物(C₆N₂H₁₆)_0.5ZnHPO₃(ZnHPO-CJ15), 并对其单晶结构进行了解析. 结果表明, ZnHPO-CJ15晶体属单斜晶系, P2₁/c空间群, a=1.19587(7) nm, b=0.82766(5) nm, c=0.77756(5) nm, α=90.00°, β=95.8370(10)°, γ=90.00°, V=0.76562(8) nm³, Z=1. ZnHPO-CJ15具有层柱状结构, 其骨架结构是由ZnO₃N四面体和HPO₃假四面体连接构成的二维4×8元环网层结构, 层与层之间由1,6-己二胺分子与Zn配位柱撑连接形成三维结构.     

Two New Piperazine Templated Lanthanide Sulfates with 2D Corrugated Layered Crystal Structures

Two new piperazine templated lanthanide sulfates (C₄N₂H₁₂)_1.5[Ln(SO₄)₃(H₂O)]·H₂O[Ln=Gd(1), Tb(2)] have been synthesized solvothermally and structurally characterized by single crystal X-ray diffraction(XRD), infrared(IR) spectroscopy, thermal analysis, fluorescent spectra and inductively coupled plasma(ICP). Single crystal X-ray diffraction reveals that both compounds 1 and 2 crystallized in the monoclinic crystal system, with space group P2₁/c and cell dimensions: a=0.64468(19) nm, b=2.9979(9) nm, c=0.9818(3) nm, β=101.271(4)°, V=1.8608(10) nm³, Z=4 for compound 1; a=0.64259(19) nm, b=3.0010(9) nm, c=0.9812(3) nm, β=101.229(4)°, V=1.8560(10) nm³, Z=4 for compound 2. Compounds 1 and 2 are isomorphous and have similar 2D corrugated inorganic frameworks fabricated via the connection of single chains and S2O₄ groups, while fully protonated piperazine cations and water molecules are located between the inorganic layers. The solid state luminescent properties of compound 2 were investigated and it displayed a typical luminescent property of Tb³⁺ with excitation wavelength at 371 nm.     

Noncentrosymmetric K2Mn3(SO4)3F2·4H2O and Rb2Mn3(SO4)3F2·2H2O with pseudo-KTP structures

Two fluoride sulfates,K₂Mn₃(SO₄)₃F₂·4H₂O(Ⅰ) and Rb₂Mn₃(SO₄)₃F₂·2H₂O (Ⅱ) are obtained by water solution method.Single-crystal X-ray diffraction analysis indicated that they crystallize in space groups of Cmc2_1.Their structures feature a pseudo-KTP structure consisting of interconnecting[Mn₃(SO₄)3F₂(H₂O)2]_∞ layers,which are further packing along the a axis with alkali metal cations balancing the charges.The structure relationships between the two compounds are discussed.Secondharmonic generation measurements manifest that Ⅰ and Ⅱ have similar second-harmonic generation responses of about 0.2 and 0.25 times that of KH₂PO₄.     

Synthesis,Structure and Characterization of Three Metal Molybdate Hydrates: Fe(H2O)2(MoO4)2·H3O,NaCo2(MoO4)2(H3O2)and Mn2(MoO4)3·2H3O

Three metal molybdate hydrates,Fe(H2O)2(MoO4)2·H3O(FeMo),NaCo2(MoO4)2(H3O2)(CoMo)and Mn2(MoO4)3·2H3O(MnMo),were synthesized by the mixed-solvent-thermal methods and characterized by singlecrystal X-ray...     

碱性介质中制备纳米四氧化三锰及其超级电容特性

比较了不同碱溶液中纳米Mn₃O₄的制备及其超级电容性能。用X射线粉末衍射仪、扫描电子显微镜和原子力显微镜等技术手段分别测试了晶体结构和表面形貌。用循环伏安、恒流充放电和交流阻抗测试了材料的电化学性能。结果表明,在氢氧化钠、氨水中Mn²⁺沉淀氧化可以直接制备纳米Mn₃O₄;碳酸钠中先生成MnCO₃,加氢氧化钠可转化为纳米Mn₃O₄。NaOH、NH₃和Na₂CO₃ 3种介质中制备的Mn₃O₄晶粒尺寸分别为29.5、20.2和36.3 nm。纳米Mn₃O₄经连续充放电循环后可活化为Birnessite-type MnO₂。氨水中制备的Mn₃O₄活化后比容量最大,达到239 F/g,是一种具有应用前景的超级电容器材料。     

8-羟基喹啉镍配合物[Ni2(HQ)3Q3]ClO4的晶体结构

8-羟基喹啉(HQ)是在化学分析中常用的试剂, 它与铝离子形成的配合物(AlQ3)也是目前有机电致发光领域最引人注目的明星分子. 在化学工业中, 8-羟基喹啉是有效的稀土及过渡金属的萃取剂, 它同中心离子的配合强度随条件改变亦有很大变化. 我们在钇和镍离子共同存在的条件下得到了标题化合物, 并测得其单晶结构.     

纳米氧化锰负载钛基电催化膜制备及处理含酚废水性能研究

以多孔钛膜为基膜,醋酸锰为锰源,采用溶胶凝胶法制备出负载纳米氧化锰的钛基电催化膜（nano-MnO_x/Ti膜）. 运用X射线衍射(XRD)、 X射线光电子能谱(XPS)、场发射扫描电子显微镜(FESEM)、循环伏安法(CV)、交流阻抗法（EIS）和计时电流法(CA)等测试手段,对MnO_x/Ti膜电极的微观形貌、晶型、电化学性能等进行表征. 结果表明：所得催化剂是由直径为50 nm的γ-MnO₂和Mn₂O₃纳米棒所组成,且均匀分布于Ti膜上,负载催化剂后钛膜电极电化学性能和催化性能明显提高,催化剂与基体之间键合的形成提高其稳定性. 以棒状nano-MnO_x/Ti膜电极为阳极构建电催化膜反应器(ECMR)处理含酚废水,当苯酚溶液浓度为10mmol·L^-1,电流密度为0.25mA·cm^-2、停留时间为15 min时,COD去除率可达95.1%.     

Synthesis and Crystal Structure of 10-Phenyl-1,7-dithia-4-oxa-10-aza-12-crown-4

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Synthesis,Electrocatalytic Properties and Crystal Structure of a New Organic—Inorganic Hybrid Constructed from Dodecamolybdophosphoric Acid and Benzotriazole

IntroductionIn the last few years there has been a rapidlygrowing number of reports in the literature ad-dressing the use of polyoxometalate- based hybridmaterials as catalysts,non- linear optical materialsand anti- virus drugs[1— 5] . In all the cases men-tioned above,the size,the shape and the chargesof the inorganic counter anions strongly affect theproperties of the materials. Polyoxometalates arelarge in size and high in electron accepting abili-ty[6] .They can form novel compounds with …     

Taibaihenryiin C的构型、构象及晶体结构

从太白山产的鄂西香茶菜中分离得到新骨架的二萜类化合物TaibaihenryiinC,对其进行X射线衍射晶体结构分析,确定其分子中各取代基的相对构型、环构象及晶体结构.研究表明,C-3位的羟基和C-11位的乙酰氧基以C-20位的甲基为参考均位于β位;分子中的A环为椅式构象,B,C环接近于船式构象,D环接近于信封式构象.特别是在D环中存在较大的扭转角,使D环中有内应力存在,这表明该化合物具有潜在的生理活性.TaibaihenryiinC的晶体结构属正交晶系,P2₁2₁2₁空间群,晶胞参数a=0.6162(1)nm,b=1.2730(1)nm,c=2.5193(3)nm,Z=4.在晶体中分子间通过C-3位的-OH氢与C-11位的乙酰氧基上的羰基氧形成分子间氢键,使分子在晶体中沿a轴呈螺旋结构排列.     

新型层状氟化磷酸铝[C4H12N2][Al2(PO4)2(H2O)2F2]的水热合成与表征

自从1982年Wilson等发现一类新型微孔材料磷酸铝分子筛(AlPO4-n)以来,大量具有新颖结构的磷酸铝化合物被合成出来,它们在催化、离子交换、吸附和主-客体组装等方面均具有潜在的应用前景,这类化合物大多是在水热或溶剂热体系中和有机模板剂存在条件下合成的,1978年,Flanigen等首先在反应体系中加入氟离子作矿化剂合成了硅晶体,后来,氟离子方法在硅铝体系和金属磷酸盐体系中也得到了广泛的应用,氟离子在反应过程中起到矿化剂或结构导向剂的作用,     

层状磷酸铝化合物Na4[Al4P4O18]·H2O的合成及质子电导性能研究

在无有机模板剂的条件下, 以Na⁺离子为结构导向剂, 通过水热合成法制备了一种与利用1,3-丙二胺合成的Uio-14具有相同层结构的二维磷酸铝化合物Na₄[Al₄P₄O₁₈]·H₂O(1), 通过单晶X射线衍射确定了其拓扑结构. 利用粉末X射线衍射、 扫描电子显微镜、 电感耦合等离子体( ICP)元素分析和热重分析等对其物理化学性质进行了表征. 结果表明, 化合物1属于单斜晶系, 空间群为P2₁/c, 晶胞参数a=1.00887(9) nm, b=0.86747(8) nm, c=0.97580(9) nm, V=0.77387(12) nm³, Z=2, 其阴离子层由铝氧三角双锥(AlO₅)和磷氧四面体(PO₄)构成, 层间通过Na⁺离子平衡电荷; 与Uio-14相比, 化合物1具有更高的热稳定性, 在400 ℃空气条件下煅烧后结构仍然保持完好. 对化合物1的质子电导性能测试结果表明, 相比于传统的分子筛类材料, 化合物1展现出优异的质子电导性能, 在55 ℃下质子电导率可达到1.19×10^-3 S/cm.     

A Novel Hydrogen-bonded Three-dimensional Network Complex Containing Nickel

A novel complex, (H3O)2[Ni(2,6-pydc)2] · 2H2O was synthesized in an aqueous solution and characterized by means of single-crystal X-ray diffraction, elemental analyses and IR spectra. The X-ray structural analysis revealed that the novel compound forms three-dimensional(3D) networks by both π-π stacking and hydrogen-bonding interactions. The crystal data for the complex are a = 13. 853 (3) nm, b= 9. 6892 (19) nm,c=13.732(3) nm, α=90. 00°, β=115.52(3)°, γ=90.00°, Z=3, R1=0. 0786, wR2=0.1522.     

Hydrothermal synthesis, crystal structure and characterization of [Zn(H2O)4]2 [H2As6V15O42(H2O)]·2H2O

The compound [Zn(H₂O)₄]₂[H₂As₆V₁₅O₄₂(H₂O)]·2H₂O (1) has been synthesized and characterized by elemental analysis, IR, ESR, magnetic measurement, third-order nonlinear property study and single crystal X-ray diffraction analysis. The compound 1 crystallizes in trigonal space group R3, a=b=12.0601(17) Å, c=33.970(7) Å, γ=120°, V=4278.8(12) Å³, Z=3 and R1(wR2)=0.0512 (0.1171). The crystal structure is constructed from [H₂As₆V₁₅O₄₂(H₂O)]⁴⁻ anions and [Zn(H₂O)₄]²⁺ cations linked through hydrogen bonds into a network. The [H₂As₆V₁₅O₄₂(H₂O)]⁶⁻ cluster consists of 15 VO₅ square pyramids linked by three As₂O₅ handle-like units.     

堇青石蜂窝陶瓷负载锰氧化物催化分解臭氧性能

为了提高臭氧分解催化剂的实际应用能力,通过采用过渡金属锰氧化物为原料与铝胶混合涂覆到堇青石蜂窝陶瓷载体表面,制备了不同锰氧化物负载的整体式催化剂。 然后在常温常压下考察了整体式催化剂分解臭氧的性能。 通过X射线衍射(XRD)、扫描电子显微镜(SEM)、拉曼(Raman)光谱、X射线光电子能谱仪(XPS)、BET比表面积法和程序升温还原技术(H₂-TPR)对催化剂进行了表征。 研究结果表明,不同锰氧化物催化剂的活性按以下顺序排列:氧化锰八面体分子筛(OMS-2)＞MnO₂＞Mn₂O₃＞Mn₃O₄＞MnO。 相比其它锰氧化物,OMS-2负载的整体式催化剂对臭氧的反应活性最高,这可能归因于OMS-2具有较大的比表面积和较好的还原性能,从而有利于表面氧空位的生成和参与臭氧分解反应。 研究结果为提高堇青石蜂窝陶瓷负载型整体式催化剂应用于臭氧分解的性能提供了理论依据。