Synthesis,Structure and Physical Properties of Mn and Cd Complexes with 1,1,2,2-Tetracarboxyl-ethylene Acid

Complex [Mn（tce） 0.5（H2O） 4]（1） was obtained from Mn（OAc） 2 and tce,where tce is 1,1,2,2-tetracarboxyl-ethane. The structure of 1 is a single molecule,in which Mn（II） is a distorted octahedron coordinated to six oxygen atoms. Complex [Cd（tce） 0.5（H2O） 3]（H2O） （2） fea-tures a pillared layer architecture. The Cd（II） atom is in an octahedral environment coordinated by six oxygen donors from water molecules and tce ligands. Cd（II） atoms are interlinked by the tce ligand to generate a 2-D wavelike layer. The layers are strutted by the intermolecular O-H···O hydrogen bonds to form a 3-D open framework. Luminescence property of complex 2 was investigated. Magnetic property of complex 1 was also studied. 1 belongs to triclinic,space group P1 with a = 6.2901（12） ,b = 8.0212（15） ,c = 8.0769（15） A,α = 108.522（3） ,β = 95.068（3） ,γ = 97.086（3） °,V = 379.92（12）A^3,Mr = 456.08,Dc = 1.993 g/cm^3,F（000） = 232,μ = 1.748 mm^-1,Z = 1,the final R = 0.0297 and wR = 0.0731 for 1575 observed reflections with I 〉 2σ（I） . 2 is of monoclinic system,space group P21/c with a = 6.4367（14） ,b = 9.495（2） ,c = 13.907（3）A,β = 117.405（8） °,V = 754.6（3） A^3,Mr = 285.51,Dc = 2.513 g/cm^3,F（000） = 556,μ = 2.905 mm^-1,Z = 4,the final R = 0.0375 and wR = 0.0737 for 1521 observed reflections with I 〉 2σ（I）.

Syntheses and Crystal Structures of Two New Hg(Ⅱ) and Cd(Ⅱ) Complexes with 2,3,5,6-Tetrakis-(2-pyridyl)Pyrazine

Under thermal gradient in solution phase, the reaction of Hg（Ⅱ） and Cd（Ⅱ） salts with 2,3,5,6-tetrakis-（2-pyddyl）pyrazine （tppz） in 1：1 molar ratio afforded dinuclear [{HgI2}2}- tppz）] （1） and mononuclear [CdI2（tppz）] （2） complexes. Single-crystal X-ray diffraction structural analysis reveals that the tppz acts as bis-tridentate and tridentate chelating ligands in 1 and 2, respectively. Metal（Ⅱ） ions adopt a distorted square pyramidal geometry and have the same coor- dination environment in both complexes. Based on the 1H NMR spectroscopy measurements, both complexes decompose in solution and release free tppz.

Synthesis,Structure and Luminescent Property of a New Cd(Ⅱ) Complex Containing 2-Propyl-imidazole-4,5-dicarboxylate

A new Cd（Ⅱ） complex（[Cd（H2PIDC）2]n） with singly deprotonated 2-propyl-imidazole-4,5-dicarboxylate as bridging ligand was synthesized and characterized by X-ray diffraction method.Crystal data：monoclinic,space group P21/c,with a=8.2547（11）,b=10.7071（15）,c=13.9131（14）A,β=126.164（5）o,V=992.8（2）A^3,C16H18N4O8Cd,Mr=506.74,Z=2,Dc=1.695g/cm^3,F（000）=508,μ=1.151 mm^-1,R=0.0296 and wR=0.0812 for 1581 observed reflections.Singly deprotonated ligands（H2PIDC-） act as μ3-bridge and join the Cd（Ⅱ） atoms into a 2-D layer structure.The 2-D layers are further linked by intermolecular hydrogen bonds into a 3D network.The luminescent property of the complex was also investigated.

Hydrothermal Syntheses, Crystal Structures and Luminescence Properties of Cu(Ⅱ) and Cd(Ⅱ) Complexes Assembled by 6-Hydroxypicolinic Acid and 1,10-Phenanthroline

Two new complexes based on 6-hydroxypicolinic acid(H_2picO) and 1,10-phenanthroline(phen), such as [Cu_4(picO)_4(phen)_4]·12 H_2O(1) and {[Cd_4(picO)_4(phen)_4(H_2O)_2]·5H_2O}_n(2), have been synthesized and characterized by IR, elemental analyses, thermogravimetric analyses and X-ray diffraction technique. Single-crystal X-ray diffraction analyses revealed that the two complexes both crystallize in the triclinic system, space group P(16)-. For complex 1, the picO ligands adopt a tridentate coordination mode to link copper(Ⅱ) ions into dimmers. PicO ligands also adopt a tridentate mode in complex 2, which connects the cadmium(Ⅱ) to form a one-dimensional chain. Moreover, luminescent properties of 1 and 2 were also investigated.

Indirect Spectrophotometric Determination of Sulphide with the Complex of Cd(Ⅱ)-5-Br-PADAP-CPB

By the use of CPB, Cd(Ⅲ) forms a highly sensitive complex with 5-Br-PADAP in aqueous solution, molar absorptivity εis 1. 21 ×105 1. mol-1. cm-1.Trace amount of sulphide can be determined from its effect on the complex of Cd (Ⅲ)-5-Br-PADAP-CPB, sulphide in the range 0~3. 2 ×10-6mol dm-3 causes a decrease in absorption, that is a linear function of the concentration, For 13ng cm-3 sulphide, common metal ions such as Na+, K+, Ca2+, Mg2+, Al3+ and anions such as CO (24μg cm-3). S2O (22μg cm-3). PO (20μg cm-3) etc. do not interfere. A method for the indirect determination of sulphide in beer and in dustrial waste water with good selectivity and accuracy is described.

Syntheses,Structures and Photoluminescent Properties of Cd(Ⅱ)Polymeric Complexes Based on 5-Aminoisophthalic Acid and Bipyridine Co-ligands

Two novel complexes, namely {[Cd（AIP）（4,4＇-bpy）]·1.3DMF}n（1） and [Cd（AIP）（2,2＇- bpy）]n（2）, have been synthesized through solvothermal reaction（H2AIP = 5-aminoisophthalic acid, 2,2＇-bpy = 2,2＇-bipyridine, 4,4＇-bpy = 4,4＇-bipyridine, and DMF = N,N＇-dimethylformamide） and structurally determined by single-crystal X-ray diffraction. Complex 1 shows a three-dimensional（3D） layer-pillar framework with rectangular channels, while complex 2 displays a two-dimensional（2D） wave net architecture. Furthermore, 1 and 2 were characterized by elemental analysis, infrared spectra（IR）, thermal gravimetric analyses（TGA） and fluorescence measurements. The luminescent properties of 1 dispersed in various organic solvents have been investigated systematically, demonstrating high selectivity for acetone via the fluorescence quenching effect.

The First Hybrid Wells-Dawson-type Polytungstate Monosupported by Cd-coordination Complex via Di-bridging O-atom

Polyoxometalates（POMs） with Cd-coordination complexes acting as supporting units are rarely reported. The linkage of the supporting units with inorganic building block（polyanion） is generally established on terminal O-atoms, but scarcely via bridging O-atoms. By introducing liquid small organic molecule（pyridine, C5NH5） as assistant ＂structure-directing agent＂, we obtained a novel organic-inorganic hybrid polytungstate,（Hpy）4[Cd（phen）2（P2W18O62）]·nH2O（1, n ≈ 3, py = pyridine, phen = 1,10-phenanthroline）, under hydrothermal conditions. The single-crystal X-ray diffraction analysis shows that 1 is the first compound containing an asymmetric heteropolyanion, [Cd（phen）2（P2W18O62）]4–, a Wells-Dawson-type polyanion monosupported by Cd-coordination complex via di-bridging O-atoms.

一种CdⅡ-MOF作为传感Fe(Ⅲ)和Cr(Ⅵ)的多响应荧光探针

通过水热法合成了一种金属有机骨架[Cd_(3)(L)_(2)(H_(2)O)_(9)]·9H_(2)O(MOF1),其中H_(3)L=5-(((4-羧基苯基)氧基)甲基)苯-1,3-二甲酸,并通过单晶X射线衍射、粉末X射线衍射和元素分析对其进行了表征。MOF1表现为一个二维微孔结构,孔隙可利用体积为22.4%。荧光性能研究表明,MOF1可以用作检测Fe(Ⅲ)和Cr(Ⅵ)的荧光传感器。它具有高选择性和低检测限,而且不受其他离子的干扰。此外,通过金属有机骨架主体和目标分析物客体的紫外可见吸收光谱研究了主体配合物的选择性荧光猝灭机制。这种荧光猝灭的可能机制是荧光共振能量转移。

Syntheses,Crystal Structures and Thermal Properties of Two Dicadmiun(II) Complexes Cd_2L_2X_2(HL=N-(3-Methoxylsalicylidene)-3-dimethylaminopropylamine,X = Cl(1),NCS(2))

Two Cd（Ⅱ） complexes, Cd2L2Cl2 （1） and Cd2L2（NCS）2 （2） （HL = N-（3-methoxylsalicylidene）-3-dimethylaminopropylamine） were synthesized and determined by EA, IR, TG and single-crystal X-ray diffraction. The crystallographic data are as follows： monoclinic, space group P21/n, a = 9.2710（9）, b = 18.0069（18）, c = 18.5562（19） A^°, β= 99.741（4）°, V = 3053.1（5）, Z = 4,μ = 1.605, F（000） = 1536, R = 0.0264 and wR = 0.0699 for 1; orthorhombic, space group Pca21, a = 16.196（3）, b = 11.506（2）, c = 36.126（7） A^°, V = 6732（2）, Z = 8,μ = 1.428, F（000） = 3264, R = 0.0376 and wR = 0.0877 for 2. There are two geometrically different octahedral Cd（Ⅱ） atoms, with N4O2 and O4Cl2 donor sets for 1 while N4O2 and N2O4 for 2. In the dinuclear Cd（Ⅱ） centers, the Cd（Ⅱ） atoms are held together by two deprotonted phenolate oxygen atoms from tetradentate L^- ligands. The thermal gravity data show two step decompositions with the residues of CdO for two complexes.

Synthesis and Crystal Structure of a Novel Terpyridine-based Cd(Ⅱ) Complex

A novel terpyridine-based complex CdL＇S2 （L＇ = oxide of L; L = 10-hexyl-3-（2,6- di（pyridine-2-yl）pyridine-4-yl）-10H-phenothiazine） has been solvothermally synthesized and characterized by FT-IR spectroscopy, elemental analysis, 1HNMR and X-ray crystallography. The sulfur of phenothiazine moiety was oxidized when the crystal is formed. The complex C36H37CdN5O2S3 crystallizes in triclinic, space group P1 with a = 9.4452（9）, b = 13.0181（14）, c = 14.6721（18） A, a = 73.872（1）, β = 81.531（1）, y = 87.547（2）°, V= 1714.2（3） A3, Mr = 780.29, Dc= 1.512 g.cm-3,μ = 0.861 mm-l, F（000） = 800, Z = 2, the final R = 0.0456 and wR = 0.1059 for I 〉 2σ-（I）. The Cd（II） is coordinated by two terminal sulfur ions and three pyridyl nitrogen atoms in a distorted trigonal bipyramidal geometry. Universal hydrogen bonds between the neighboring molecules have generated a supramolecular arrangement which contributes to the stability of the title complex. Fluorescence property and thermogravimetry of the complex have also been investigated and discussed.

A Porous 3D Supramolecular Architecture of Cd(II) Complex with Water Clusters as Pillars

A supramolecular complex of Cd（II） with 1D water tapes as pillars[Cd2（dpa）2（phen）2（H2O）2]·6H2O 1 （H2dpa = diphenic acid, phen = phenanthroline）, has been synthesized and characterized by elemental analysis, IR spectroscopy, and single-crystal X-ray diffraction analysis. The crystal is of triclinic, space group P1^- with a = 9.7029（4）, b = 11.9601（5）, c = 12.1788（4） A, α = 71.6990（10）, β = 71.8740（10）, γ = 74.4680（10）°, V = 1252.39（8） A^3, C52H48Cd2N4O16, Mr = 1209.76, Z= 1, Dc = 1.604 g/cm^3,μ = 0.925 mm^-1, F（000） = 612, R = 0.0679 and wR = 0.2514 for 3870 observed reflections （I 〉 2σ（I））. Two intramolecular Cd（II） centers of this complex are encircled by two dpa^2- ligands forming an 18-membered ring, which is further assembled into a pillared three-dimensional （3D） supramolecular architecture through the synergetic effect of intermolecular face-to-face π…π stacking and weak O-H…O hydrogen-bonding interactions. Moreover, this complex exhibits photoluminescence with the main emission bands located at about 456 nm upon excitation at 355 nm in the solid state at room temperature.

Synthesis,Crystal Structure and Magnetic Property of a New Cd(Ⅱ) Complex with Four Nitronyl Nitroxide Radicals

A new Cd（Ⅱ） complex with four nitronyl nitroxide radicals [Cd（NIT4Py）4Cl2]（NIT4Py = 2-（4＇-pyridinyl）-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide） has been synthesized and structurally characterized by X-ray diffraction analysis.It crystallizes in triclinic,space group P1 with a = 7.2441（4）,b = 13.6964（8）,c = 13.7354（8） ,α = 89.8610（10）,β = 77.9180（10）,γ = 87.2250（10）°,V = 1331.01（13） 3,C48H64CdCl2N12O8,Mr = 1120.41,Z = 1,Dc = 1.398 g/cm3,μ（MoKα） = 0.573 mm-1,F（000） = 582,S = 1.043,the final R = 0.0257 and wR = 0.0641 for 4333 observed reflections（I 〉2σ（I））.The title complex exists in the mononuclear-metal structures,in which each Cd（Ⅱ） ion adopts a distorted octahedral geometry and is coordinated by two Cl-anions and four pyridyl-N atoms from four NIT4Py ligands.The magnetic measurements show weak antiferromagnetic interactions between the nitroxide radicals.

Solvothermal Synthesis and Crystal structure of a Two-dimensional Cd(Ⅱ) Complex Based on a Flexible Carboxylate Ligand

A two-dimensional Cd（Ⅱ） coordination polymer, [Cd（dtb）]n （dtb = 5,5 ＇-dithiobis（2- nitrobenzoic acid）, has been solvothermally synthesized and characterized by elemental analysis, IR, TG analysis and single-crystal X-ray diffraction analysis. The complex crystallizes in the monoclinic P21/c space group, with a = 10.7147（10）, b = 7.4518（7）, c = 22.053（2） A, β = 95.477（2）°, V = 1752.7（3） A3, Z = 4, Mr = 524.74, Dc= 1.989 g/cm3 and F（000） = 1032. The final R = 0.0453 and wR = 0.1201 for 2950 observed reflections with 1 〉 2σ（I）. In the complex, the Cd（Ⅱ） ion is coordinated with six oxygen atoms from four different carboxylate groups of dtb ligands and one lattice water molecule. The adjacent Cd centers are interconnected by the flexible carboxylate ligand to form a two-dimensional （2D） structure.

Synthesis,Crystal Structure and Magnetic Behavior of a Novel Cd(Ⅱ) Complex with Four Nitroxide Radicals

A novel diamagnetic-metal Cd（Ⅱ） complex with four nitroxide radicals[Cd（IM4Py）4Cl2]（IM4Py=2-（4＇-pyridinyl）-4,4,5,5-tetramethylimidazoline-1-oxyl） was synthesized and characterized by elemental analyses,IR spectra,UV-Vis spectra and X-ray single crystal diffraction.The complex crystallized in triclinic space group P1 with a=0.93285（14） nm,b=1.16827（18） nm,c=1.3660（2） nm,α=112.759（2）°,β=104.524（2）°,γ=92.008（3）°,V= 1.3143（3） nm3,Z=1,Dc=1.335 g/cm3,the final R1=0.0423 and wR2=0.1009.In the title complex,each Cd（Ⅱ） ion adopting a distorted octahedral geometry is coordinated by two Cl-anions and four pyridyl-N atoms from four IM4Py ligands.The magnetic measurements show the weak antiferromagnetic interactions between the nitroxide radicals.

磷霉素氨基葡萄糖盐β-CD包合物的制备与研究

目的 制备磷霉素氨基葡萄糖盐(FA)-β-环糊精(β-CD)包合物,解决磷霉素氨基葡萄糖盐高温不稳定、引湿性强的问题。方法 采用冷冻干燥法制备FA-β-CD包合物,以包合率和收率为评价指标,单因素考察投料质量比、包合时间、包合温度对包合效果的影响;通过红外光谱分析、X-射线衍射法对FA-β-CD包合物进行鉴定;对FA、FA-β-CD包合物以及β-CD进行抗菌活性测试;对FA和FA-β-CD包合物及其溶液在不同温度下进行稳定性考察。结果冷冻干燥法制备FA-β-CD包合物的最佳工艺为m(β-CD)∶m(FA)=1.25∶1,包合时间为2h,包合温度为20℃;抗菌活性测试和稳定性考察结果均表明β-CD能够较好的保护FA。结论冷冻干燥法可以成功制备FA-β-CD包合物,并能提高FA的稳定性。

Synthesis and CD Spectra of Chiral Molybdenum-fullerenyl Complexes with Pineno-bipyridine Ligands

The synthesis and characterization of two chiral fullerene complexes (+)_(430)^(CD)-[Mo(η~2-C_(60))(CO)_3(L^(RR))] 1 and (-)_(430)^(CD)-[Mo(η~2-C_(60))(CO)_3(L^(SS))] 2 were described. The CD spectra of 1 and 2 inthe visible range show weak Cotton effects, which are approximately of mirror image, indicatingthat the appended pineno-groups with opposite chirality in bipyridines can perturb the fullerenechromophores through the molybdenum centers and lead to induced CD effects.

A COMPARISON OF THE DETERMINATION OF STABILITY CONSTANTS OF COMPLEXES OF Cd(Ⅱ)WITH AMINO ACIDS AND SIMPLE PEPTIDES USING MICRO—pH—METRIC TITRATIONS AND CYCLIC VOLTAMMETRY

This paper reports the determination of stability constants for complexes of Cd(Ⅱ)with Gly, Ala,Val,Asp,Gly—Asp,Asp Gly,Gly—Gly and Gly—Gly—Gly using both micro—pH—metric titra- tions and the application of convolution—deconvolution cyclic voltammetry at 25℃ and I=0.10 mol· dm^(-3)(KNO_3).Stability constants were calculated from pH—metric data using the SUPERQUAD com- puter program and cyclic voltammograms were collected,stored and manipulated using the EG and G CONDECON 300 software.A considerably larger ligand:metal ratio(e,g.50:1)was possible using voltammetry.Evaluation of results from the two techniques suggests that stability constants for the species[CdL_2]and[CdL_3]are reliable when calculated fromvoltammetry while those for[CdL]are more reliable when determined by pH-metric titration.

复合改良剂对稻田Cd、As活性与累积的协同调控

为同时降低水稻糙米中Cd、As含量,以达到国家标准食品污染物限量标准,选取湘南某矿区Cd-As复合污染稻田土壤,以盆栽实验研究复合改良剂QFJ（羟基磷灰石＋沸石＋酸改性炭化秸秆）对土壤中Cd、As生物有效性及对水稻各部位累积Cd、As的影响,探讨QFJ对土壤Cd、As生物活性与稻米Cd、As累积的协同调控.结果表明：施用QFJ降低了水稻糙米中的Cd、As含量,施加量2g/kg时,糙米中Cd、As含量分别为0.19mg/kg和0.14mg/kg,均低于对照组的0.49mg/kg和0.27mg/kg,且同时低于0.2mg/kg,达到了国家标准食品污染物限量标准.施用QFJ提高了土壤p H值0.02~0.68单位,增加了土壤CEC、OM含量,同时土壤中Cd的酸可提取态、交换态及TCLP提取态含量分别降低了7.3%~32.5%、12.6%~39.8%和40.7%~60.1%,对As的交换态和TCLP提取态含量的影响趋势是先降低后增大.糙米中Cd含量与土壤中Cd的3种提取态含量存在极显著正相关关系,As含量与其土壤中TCLP提取态含量存在极显著正相关关系.当QFJ施加量在2g/kg水平时,土壤中Cd、As的生物活性可协同控制在较低水平,从而同时降低了糙米中Cd、As含量.施用QFJ使得Cd在水稻根表铁膜中的含量呈增大趋势,在水稻其他部位含量呈减小趋势;As在谷壳中含量呈减少趋势,在其他各部位呈先减小后增大的趋势.水稻吸收的Cd和As大部分累积在根部和茎叶部,各部位Cd累积率大小是白根〉茎叶〉糙米〉谷壳,As是茎叶〉白根〉糙米〉谷壳.根据Cd-As污染程度不同,可考虑施用2~4g/kg QFJ以达到水稻的安全生产.

土壤-植物系统中模拟酸雨与Cd复合污染的短期环境效应——黄豆盆栽试验

通过盆栽实验,研究了在黄豆(Glycine max)的一个生长周期内,模拟酸雨与Cd复合污染对土壤基本性质的影响,模拟酸雨作用下土壤-植物系统中Cd的迁移转化规律以及模拟酸雨与Cd复合污染对黄豆生长与生理特性的影响,探讨了土壤-植物系统中这种复合污染的短期环境效应.结果表明,短期内模拟酸雨和Cd污染对土壤-植物系统都有致害作用,但Cd污染的效应大于模拟酸雨的效应,模拟酸雨与Cd复合污染环境效应大于这2种污染物的单因素效应,且表现出明显的协同作用.在本试验条件下,pH值为3·5的模拟酸雨和20mg·kg-1Cd的处理组合对土壤-植物系统的危害最严重.尽管在短期内,协同作用仅在土壤交换态Cd含量、黄豆茎和根中的Cd含量这3项指标上得到一定程度的体现,但这种复合污染的化学机制和环境效应值得关注,这2种污染物长时期共同作用对土壤-植物系统的影响也值得深入研究.