Thermal Decomposition Reaction Kinetics Model of Powdered Bastnaesite

Ｔｈｅｔｈｅｒｍａｌｄｅｃｏｍｐｏｓｉｔｉｏｎｏｆｂａｓｔｎａｅｓｉｔｅｃａｌｃｉｎｅｄｉｎａｉｒａｔｍｏｓｐｈｅｒｅｗａｓｏｎｅｏｆｔｈｅｐｒｅ ｔｒｅａｔｍｅｎｔｓｔｅｐｉｎｈｙｄｒｏｍｅｔａｌｌｕｒｇｙａｎｄｐｙｒｏｍｅｔ ａｌｌｕｒｇｙ[1,2 ] .Ｔｈｅｉｎｆｌｕｅｎｃｅｏｆｄｅｃｏｍｐｏｓｉｔｉｏｎｔｅｍｐｅｒａｔｕｒｅａｎｄａｔｍｏｓｐｈｅｒｅｏｎｔｈｅｄｅｃｏｍｐｏｓｉ ｔｉｏｎｐｒｏｄｕｃｔｓｗａｓｉｎｖｅｓｔｉｇａｔｅｄｂｙＸｉａｎｇｅｔａｌ[3～ 5 ] .Ｔｈｅｒｍａｌａｎａｌｙｓｉｓｔ…     

[Eu2(p-MOBA)6(phen)2](H2O)2配合物热分解动力学研究

采用ＴＧ－ＤＴＧ技术研究了「Ｅｕ２（ｐ－ＭＯＢＡ）６（ｐｈｅｎ）２」（Ｈ２Ｏ）２（ｐ－ＭＯＢＡ代表对甲氧基苯甲酸根离子;ｐｈｅｎ表示１,１０－邻啡罗啉）在静态空气中的非温热分解过程及动力学,根据ＴＧ曲线确定了热分解过程的中单产的及最终产物,动用Ａｃｈａｒ法与Ｃｏａｔｓ－Ｒｅｄｌｆｅｒｎ法对非等温动力学数据进行分析,推断出和线步的动力学方程为ｄａ／ｄｔ＝ＡｅｘＰ（－Ｅ／ＲＴ）「－ｌｎ（１－ａ）」＾－     

Synthesis and Crystal Structure of a 4f-3d Complex [La(DMF)_6(H_2O)_3][Cr(CN)_6]·2H_2O

Ｒｅｃｅｎｔｌｙ ,ｔｈｅｒｅｈａｓｂｅｅｎｃｏｎｓｉｄｅｒａｂｌｅｉｎ ｔｅｒｅｓｔｉｎｌａｎｔｈａｎｉｄｅ(Ⅲ )ｈｅｘａｃｙａｎｏｆｅｒｒａｔｅｓａｎｄｔｈｅａｎａｌｏｇｏｕｓｃｏｂａｌｔ(Ⅲ )ａｓｗｅｌｌａｓｃｈｒｏｍｉｕｍ(Ⅲ )ｃｏｍｐｌｅｘｅｓｂｅｃａｕｓｅｏｆｔｈｅｉｒｐｏｔｅｎｔｉａｌａｓｃａｔａｌｙｔｉｃ ,ｓｅｍｉｃｏｎｄｕｃｔｉｖｅ ,ａｎｄｍａｇｎｅｔｉｃｍａｔｅ ｒｉａｌｓ[1～ 4] .Ｆｏｒｅｘａｍｐｌｅ ,ｍａｇｎｅｔｉｃｓｔｕｄｉｅｓｏｎａｓｅｒｉｅｓｏｆｔｈｒｅｅ ｄｉｍｅｎｓｉｏ…     

Thermochemical Study on Ternary Solid Complex of La(Gly)2(Ala)3Cl3·2H2O (s)

The complex of lanthanum chloride with Glycine and Alanine, La(Gly)2(Ala)3Cl3·2H2O, was synthesized and characterized by IR, elementary analysis, thermogravimetric analysis, and chemical analysis. The dissolution enthalpies of LaCl3 ·7H2O(s), 2Gly(s) + 3Ala(s) and La(Gly)2(Ala)3Cl3 ·2H2O(s) were determined in 2 mol·L-1 HCl by a solution-reaction isoperibol calorimeter. By designing a thermochemical cycle in terms of Hess′ Law and through calculation, the reaction enthalpy of lanthanum chloride seven-hydrate with Glycine and Alanine was obtained: ΔrHθm (298.15 K)=(29.652±0.504) kJ·mol-1, and the standard enthalpy of formation of La(Gly)2(Ala)3Cl3·2H2O(s) ΔfHθm [La(Gly)2(Ala)3Cl3·2H2O, s, 298.15 K]=-4467.6±8.3 kJ·mol-1.     

稀土对K11[Sm(AlW11O39H2)2]·21H2O的气相热扩渗及其导电性研究

参照文献合成了标题化合物. 对所合成化合物进行了高温气相多组分混合稀土化学热扩渗, 经ICP, XPS, IR, XRD和TG-DTA等测试分析证实, 微量稀土元素La和Ce等已渗入到杂多配合物的体相. 利用四电极法对扩渗后化合物的导电性能进行了研究, 其导电率δ为9.2×0-3 S·cm-1, 比扩渗前(δ=1.29×0-9 S·cm-1)提高了7.1×06倍.     

糠醛缩丙氨酸合Dy(Ⅲ)配合物的合成、表征及热分解反应动力学

合成了糠醛缩丙氨酸合Dy配合物,通过元素分析、红外光谱、紫外光谱、摩尔电导和热重分析,研究了配合物的组成和热分解反应机理。     

Hydrothermal synthesis and crystal structure study of two novel 3-D mellitates {Nd2[C6(COO)6](H2O)6} and {Ho2[C6(COO)6](H2O)6}

Two novel 3-D coordination compounds, Nd2[C6(COO)6](H2O)6(1)and Ho2[C6(COO)6](H2O)6(2), were hydrothermally synthe-sized from mellitic acid and neodymium perchlorate (or holmium perchlorate) in the alkaline aqueous solution and characterized with ele-mental analysis, TG, IR spectrum, and single crystal X-ray diffraction. The two compounds were isostructural and crystallized in the ortho-rhombic system, space group Pnnm, with a=1.3531 (4) nm, b=0.6687 (2) nm, c=1.0224(3) nm, V=0.92523(5) nm3, Z=4, D=2.630 g/cm3, F(000)=696.0, Goof=1.052. Final R indices [I 2Σ(I)]: R1=0.0195, wR2=0.0382 for 1; a=1.3411(2) nm, b=0.6586(1) nm, c=1.0116(2) nm, V=0.8935(3) nm3, Z=4, D=2.877 g/cm3, F(000)=724.0, Goof=1.061. Final R indices [I 2Σ(I)]: R1=0.0200, wR2=0.0479 for 2. In the two compounds 1 and 2, the mellitic acid ligand, in which all the carboxylate groups were deprotonated, had only one kind of coordination mode to bridge metal ions to form four-connected three-dimensional diamondiod networks.     

Lanthanide Complex [Nd(dpdo)_4(H_2O)_3][ClO_4]_3·4.5H_2O·dpdo Containing Framework Based on 4,4′-Dipyradine-Dioxide

Ｃｒｙｓｔａｌｅｎｇｉｎｅｅｒｉｎｇｏｆｃｏｏｒｄｉｎａｔｉｏｎｐｏｌｙ ｍｅｒｓｗｉｔｈｏｐｅｎｆｒａｍｅｗｏｒｋｓａｓｓｅｍｂｌｅｄｆｒｏｍｏｒ ｇａｎｉｃ ｍｅｔａｌｃｏｍｐｏｕｎｄｓｈａｓｂｅｅｎｏｆｇｒｅａｔｉｎｔｅｒ ｅｓｔｓｏｗｉｎｇｔｏｔｈｅｉｒｐｏｔｅｎｔｉａｌｐｒｏｐｅｒｔｉｅｓａｓｎｏｖｅｌｍａｔｅｒｉａｌｓｓｕｃｈａｓｇａｓａｄｓｏｒｐｔｉｏｎ[1,2 ] ,ｉｏｎ ｅｘ ｃｈａｎｇｅ[3] ａｎｄｃａｔａｌｙｓｉｓ[4] .Ｔｈｅｃｏｎｓｔｒｕｃｔｉｏｎｏｆｃｏｏｒｄｉｎａｔｉｏｎｐｏｌｙｍ…     

Synthesis and Characterization of Eu4(PMA)3(phen)0.75·7H2O Ternary Luminescent Complex

Eu(Ⅲ)-Pyromellitic acid[PMA]-1,10-phenanthroline (phen) ternary luminescent complex was prepared in ethanol and water mixed solvent. The elemental analysis, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) fourier-transform infrared spectroscopy (FT-IR) indicates that its chemical constitution is Eu4(PMA)3(phen)0.75·7H2O. TG-DTA curves indicated that the complex is heat stable at the temperature of 430 ℃. The XRD patterns showed that the complex is a new crystal different from the two ligands' structures. SEM image indicates that the complex is in block shape and disperses well. Photoluminescence (PL) analysis indicates that the complex emits Eu3 characteristic luminescence under ultraviolet excitation.     

Thermochemical Kinetics of Sm(Gly)_4Im(ClO_4)_3·2H_2O Reacting with Microbes

Ｒａｒｅｅａｒｔｈｉｏｎｓｐｏｓｓｅｓｓｏｂｖｉｏｕｓｆｏｓｔｅｒｅｆ ｆｅｃｔｏｎｔｈｅｇｒｏｗｉｎｇｏｆｃｒｏｐ[1] .Ａｍｉｎｏａｃｉｄｓａｒｅｔｈｅｃｏｍｐｏｎｅｎｔｓｏｆｐｒｏｔｅｉｎｓ ,ａｎｄｔｈｅｒｅａｒｅｍａｎｙｒｅｐｏｒｔｓａｂｏｕｔｔｈｅｓｔｕｄｙｏｎｔｈｅｂｉｎａｒｙｃｏｍｐｌｅｘｅｓｏｆｒａｒｅｅａｒｔｈｗｉｔｈａｍｉｎｏａｃｉｄｓ[2 ,3] .Ｉｍｉｄａｚｏｌｅｉｓａｈｅｔｅｒｏｃｌｙｃｌｉｃｃｏｍｐｏｕｎｄｐｏｓｓｅｓｓ ｉｎｇｂａｃｔｅｒｉｃｉｄｅａｎｄａｎｔｉ ｉｎｆｅｃｔｉ…     

Synthesis and Property of H2La2Ti3O10/CdS Layered Nanocomposite Photocatalyst

H2La2Ti3O10/CdS nanocomposite with er photoactivity was synthesized by a stepwise exchange process from H2La2Ti3O10, which was obtained by H^＋ -exchanging reaction of H2La2Ti3O10 with HCl other than the normally used HNO3. The pillaring process was investigated by XRD, TEM, FT-IR and BET methods. The photocatalytic decomposition of aniline was used as the model system to evaluate the photochemical properties of H2La2Ti3O10/CdS,H2La2Ti3O10 and K2La2Ti3O10. It is found that the photoactivity of layered H2La2Ti3O10 is greatly improved by the intercalation of CdS in the interlayer. In general, the excellent photoactivity of the H2La2Ti3O10/CdS nanocomposite might be attributing to the extremely small particle size of incorporated CdS and good contact between CdS and La2Ti3O10^2- layers. On the other hand, the coupling of two semiconductor particles with different energy gap is useful to achieve effective charge separation. In H2La2Ti3O10/CdS, a photo-generated electron can transfer from CdS to the La2Ti3O10^2- layer, while the holes remain in the CdS particles. This helps to diffuse the electrons and holes before reaching the interface, and the holes and electrons can be effectively captured by the electrolyte in the solution. Simuhaneously, the optimal operating condition of photodecomposition aniline was investigated.     

Syntheses and Crystal Structure of Nine-Coordinate Mononuclear Na[ EuⅢ (edta)(H2O)3] · 4H2O and Binuclear Na4[Eu2Ⅲ(Httha)2]·10H2O Complexes

The crystal and molecular structures of the Na[Eu Ⅲ (edta) ( H2 O) 3] · 4H2O ( edta = ethylenediaminetetraacetic acid) and Na4[Eu2Ⅲ (Httha)2] · 10H2 O ( ttha = triethylenetetraminehexaacetic acid) complexes were determined by single-crystal X-ray structure analyses.The crystal of Na[ EuⅢ (edta) (H2O)3] · 4H2O belongs to orthorhombic crystal system and Fdd2 space group.The crystal data are as follows: a = 1.9415 (15)nm, b = 3.544(3 )nm, c = 1.203(9)nm, V = 8.327(5)nm3, Z = 16, M = 589.27, Dc= 1.880 g· cm-3, μ= 3.108mm-1 and F(000) = 4704.The final R and wR values are 0.0312 and 0.0750 for 2091[I ＞ 2.0σ (I)] reflections, and 0.0344and 0.0766 for all 3932 unique reflections, respectively.The[EuⅢ (edta) (H2O) 3] - anion has a nine-coordinate pseudo-monocapped square antiprismatic structure in which the nine coordinate atoms, two N and seven O, are from one edta ligand and three water molecules.The crystal of Na4[Eu2Ⅲ (Httha)2] · 10H2O belongs to orthorhombic system and Pccn space group.The crystal data are as follows: a = 2.610(3)nm, b = 2.089(3)nm, c = 2.239(3)nm, V =12.208 ( 28 ) nm3, Z = 8, M = 1548.92, Dc= 1.686g·cm-3,μ = 2.115 mm-1andF(000) = 6272.Thefinal R and wR are 0.0625 and 0.1091 for 9834[I ＞ 2.0σ(I)] reflections, and 0.1608 and 0.1471 for all 37818 unique reflections, respectively.The whole complex molecule is composed of two close parts in which each one has a nine-coordinate structure with distorted monocapped square antiprismatic prism.The ttha ligand in the[Eu2Ⅲ (Httha)2] 4- anion coordinates to one Eu Ⅲ ion with three N atoms and four O atoms and to the other Eu Ⅲ ion with two O atoms.     

Synthesis and Structural Determination of Eight Coordinate NH_4[Yb(Ⅲ)(Cydta)(H_2O)_2]·5H_2O

ｅｃａｕｓｅｓｏｍｅｒａｒｅｅａｒｔｈｍｅｔａｌｃｏｍｐｏｕｎｄｓｈａｖｅｔｈｅｐｒｏｍｏｔｉｖｅａｃｔｉｏｎｔｏｔｈｅｇｒｏｗｔｈｏｆａｎｉ ｍａｌｓａｎｄｐｌａｎｔｓ[1 ] ,ａｎｄｔｈｅｆｕｎｃｔｉｏｎｏｆａｎｔｉｉｎ ｆｌａｍｍａｔｉｏｎ ,ａｎｔｉｂａｃｔｅｒｉｕｍ ,ａｎｔｉｃｏａｇｕｌａｎｔｉｏｎａｎｄａｎｔｉｃａｎｅｒ[2 ] ,ｔｈｅｉｎｖｅｓｔｉｇａｔｉｏｎｏｎｔｈｅｓｙｎ ｔｈｅｓｅｓａｎｄｓｔｒｕｃｔｕｒｅｓｏｆｔｈｅｅｖｅｒｙｋｉｎｄｓｏｆｒａｒｅｅａｒｔｈｍｅｔａｌｃｏｍｐｏｕｎｄｓ…     

Synthesis, Characterization and Antitumor Activity of Lanthanum(Ⅲ) Complex with Demethylcantharidate

A novel complex of lanthanum(Ⅲ) with demethylcantharidate group (DCA), Na[La(DCA)2(H2O)], was synthesized in aqueous solution and characterized by elemental analysis, molar conductance, IR, UV, 1H-NMR spectra and TG-DTA. The results suggest that lanthanum ion is seven-coordinated. Six oxygen atoms are from carboxyl groups and cyclic ethers of two DCA ligand, and on oxygen is from a H2O. The antitumor activities of the complex against HL-60 human leukemia, BGC-823 human gastric carcinoma, Bel-7402 human hepatic carcinoma, Hela human cervical carcinoma were investigated with MTT or SRB assays. Na[La(DCA)2(H2O)] exhibits stronger inhibition against certain kinds of cancer cells than Na2DCA in vitro.     

Syntheses and Structures of Two Heteronuclear Complexes with Glycine {[CuEr(Gly)_5(H_2O)_2](ClO_4)_5·H_2O}_n and {[Cu_2Gd_2(Gly)_10 (H_2O)_4](ClO_4)_10·4H_2O}_n

Ｉｎｔｈｅｐａｓｔｆｅｗｙｅａｒｓ ,ｔｈｅｍａｇｎｅｔｉｃｐｒｏｐ ｅｒｔｉｅｓｏｆｃｏｍｐｌｅｘｅｓｃｏｍｐｒｉｓｉｎｇｌａｎｔｈａｎｉｄｅａｎｄｔｒａｎｓｉｔｉｏｎｍｅｔａｌｉｏｎｓｈａｖｅａｔｔｒａｃｔｅｄｉｎｃｒｅａｓｉｎｇｉｎｔｅｒｅｓｔ[1～ 6 ] .Ｔｈｅｓｅｃｏｍｐｌｅｘｅｓａｒｅｉｍｐｏｒｔａｎｔｉｎｔｈｅｓｔｕｄｉｅｓｏｆｍａｇｎｅｔｉｃｅｘｃｈａｎｇｅｉｎｔｅｒａｃｔｉｏｎｂｅｔｗｅｅｎｌａｎｔｈａｎｉｄｅａｎｄｄ ｔｒａｎｓｉｔｉｏｎｍｅｔａｌｉｏｎｓ,ａｎｄｔｈｅｙｃａｎｐｒｏ…     

Synthesis and Structure of Polynuclear Complex [La(bphsb)2(NO3)3]n

Ｓｏｍｅｌａｎｔｈａｎｉｄｅｃｏｍｐｌｅｘｅｓｗｉｔｈｄｉｓｕｌｆｏｘｉｄｅｓｈａｖｅｂｅｅｎｓｔｕｄｉｅｄ［１，２］．Ｈｏｗｅｖｅｒ，ｒｅｌａｔｉｖｅｌｙｌｉｔｌｅｗｏｒｋｈａｓｂｅｅｎｄｏｎｅｏｎｃｒｙｓｔａｌｓｔｒｕｃｔｕｒｅｏｆｔｈｅｓｅｃｏ...     

Conductivity of K_(10)H_3[Dy(SiW_4Mo_7O_(39))_2] Treated by Chemistry-Heated Diffusion of Sm and Gd Permeation

Inthelastfewyears ,theapplicationsofpolyox ometalates (POMs)havereceivedmuchattention[1～ 3]fortheiruniquestructuresandproperties ,however ,thepreparationofthemareallofsolid solidorliquid liquidreactions[1] .Fromtheknowledgeoffundamen taltheory ,wethinkthatrareearthelementscanbepermeatedintoPMOsthroughthesolid gasinterfacereaction ,andtoourknowledgethiskindofexperi menthasnotbeencarriedoutuntilnow .Inthispaper ,thechemistry heateddiffusedperme ationmethod[4 ] wasusedtotreatK10 H3[Dy(SiW4 M…     

La(C7H5O3)2·(C9H6NO)的合成及热化学研究

研究由七水氯化镧与水杨酸、8-羟基喹啉反应合成镧与水杨酸、8-羟基喹啉多元混合配合物,并对该配合物进行表征.测定该合成反应的标准摩尔反应焓以及配合物的标准摩尔生成焓.通过红外光谱、元素分析、摩尔电导率、差热热重分析以及化学分析等方法来确定配合物的组成.应用溶解量热法分别测定了七水氯化镧、水杨酸、8-羟基喹啉和配合物在298.15 K、混合量热溶剂(VDMFVEtOHVHClO4=110.5)中的标准摩尔溶解焓.通过设计热化学循环,根据盖斯定律计算了合成反应的标准摩尔反应焓以及配合物的标准摩尔生成焓.该配合物的分子式是La(C7H5O3)2·(C9H6NO).各物质的溶解焓分别为△sH(I○)mLaCl3·7H2O(s),298.15 K]=-96.45±0.18 kJ·mol-1,△sH(I○)m[2 C7H6O3(s),298.15 K]=14.99±0.17 kJ·ml-1,△SH(I○)m[C9H7NO(s),298.15 K]=-3.86±0.06kJ·mdl-1及△S(I○)m[La(C7H5O3)2·(C9H6NO)(s),298.15K]=-117.78±0.11kJ·mol-1.反应LaCl3·7H2O(s)+2C7H6O3(s)+C9H7NO(s)=La(C7H5O3)2·(C9H6NO)(s)+3HCl(g)+7H2O(1)的标准摩尔反应焓为91.57±0.33 kJ·mol-1.La(C7H5O3)2·(C9H7NO)(s)的标准摩尔生成焓为△sH(I○)m[La(C7H5O3)2·(C9H6NO)(s),298.15 K]=-2076.5±3.9 kJ·mol-1.