几种螯合剂解镍致小鼠胰脏毒作用比较

小鼠腹腔注射氯化镍溶液(5 mg Ni/kg)染毒，观察了N-苯甲基-D-葡糖氨基二硫代甲酸钠(BGD)、二乙氨基二硫代甲酸钠(DDTC)、二羟乙氨基二硫代甲酸钠(DHED)及meso-2，3-二巯基丁二酸钠(DMSA)等螯合剂对镍致小鼠胰脏毒性的解毒作用。镍染毒后引起小鼠胰脏胰蛋白酶活性升高和羧肽酶A活性降低以及组织中镍、钙、锌浓度增加；镍染毒30 min和24 h后进行各螯合剂治疗(剂量均为400 μmol/kg)，BGD、DDTC和DMSA可明显抑制上述变化，其中BGD解镍毒效果最好、自身毒性最小、对镍致小鼠胰脏毒性有更好的解毒作用。     

粉末化学镀法制备的NiB／TiO2非晶态合金催化剂对环丁烯砜加氢反应的催化性能

 采用诱导沉积法及粉末化学镀法分别制备了纯态NiB及负载型NiB／TiO2非晶态合金催化剂．用XRD，ICP，SEM，TEM和DSC等手段对催化剂的物性及TiO2载体与NiB非晶态合金之间的相互作用进行了表征，考察了非晶态合金的结构、组成、形貌和热稳定性，并将其用于环丁烯砜加氢反应中．结果表明，相对于NiB而言，NiB／TiO2催化剂具有优良的热稳定性和催化活性，这缘于NiB和TiO2载体之间的相互作用及载体的分散作用．     

Methodology for the synthesis of the core EFGH rings of diazonamide A

Conversion of substituted 2-oxindoles into 2-thionoindoles followed by Raney nickel desulfurization provides a mild method for synthesizing the core EFGH rings of diazonamide A.     

New mixed tellurides of nickel and Group 13–14 metals Ni<Subscript>3−δ</Subscript>MTe<Subscript>2</Subscript> (M = Sn,In, Ga)

Three new mixed tellurides of nickel and group 13–14 metals Ni_3−δMTe₂ (M = Sn, In, Ga) were prepared by high-temperature ampoule synthesis and studied by powder X-ray diffraction analysis. The compound Ni_3−δSnTe₂ was also studied by single crystal X-ray diffraction analysis. The structural model of this phase and two analogs was described as consisting of layers with nickel-main group metal bonds confined from the above by tellurium atoms. The van der Waals gap formed through contacts between the tellurium atoms of neighboring layers is partially occupied by nickel atoms. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1879–1881, October, 2007.     

电化学合成镍配合物的研究

采用金属镍为“牺牲”阳极，首次在无隔膜电解槽中，电化学溶解金属镍一步 制备了纳米NiO前驱体Ni(Oet)2,Ni(Obu)2,Ni(Oet)2(acac)2，Ni(Obu)2(acac)2 [acac为乙酰丙酮基].产物通过红外光谱（FT-IR）、拉曼光谱（Raman spectrum） 进行表征。同时讨论了影响电合成镍醇盐及其配合物的关键因素。实验表明，防止 阳极钝化，温度控制在30-40℃，采用有机胺溴化物为导电盐，可以提高电合成效 率。     

Die Kristallstruktur von Na2NiAlF7—ein Beitrag zum Problem der wahren Raumgruppe orthorhombischer Weberite

The Crystal Structure of Na₂NiAlF₇ — a Contribution to the Problem of the True Space Group of Orthorhombic Weberites The X-ray single crystal structure determination of the orthorhombic weberite Na₂NiAlF₇ (a = 707.4(2), b = 1003.8(2), c = 731.5(1) pm; Z = 4) was performed in space group Imma, after all reflections hk0 with h(k) = 2n + 1 could be eliminated, as they proved simulated by Renninger effect and/or λ/2 reflections. The alternative space groups Imm2 resp. I2₁2₁2₁ of former weberite structure determinations thus became obsolete. The refinement using 880 independent reflections ended at wR = 0.0232. The resulting average distances within the framework of octahedra are Ni? F = 197.3, Al? F = 180.4 pm.     

Vinyl-polymerization of norbornene with novel anilido–imino nickel complexes/methylaluminoxane: Abnormal influence of polymerization temperature on molecular weight of polynorbornenes

Herein reported are investigations of norbornene polymerization by novel anilido–imino nickel complexes [(Ar¹NCHC₆H₄NAr²)NiBr]₂ (Ar¹ = Ar² = 2,6-dimethylphenyl, 1; Ar¹ = 2,6-dimethylphenyl, Ar² = 2,6-diisopropylphenyl, 2; Ar¹ = Ar² = 2,6-diisopropylphenyl, 3; Ar¹ = 2,6-diisopropylphenyl, Ar² = 2,6-dimethylphenyl, 4) activated with methylaluminoxane (MAO). It was found that at polymerization temperatures below 50 °C, the average molecular weights of the obtained polynorbornenes catalyzed by these four catalytic systems increase with raising temperature, displaying bimodal distribution in GPC curves. The abnormal influence of polymerization temperature could be attributed to the existence of two kinds of catalytic species: heterobimetallic species LNi(II)(μ-Me)₂AlMe₂ (I) and monometallic species LNi(II)Me (II) (L = anilido–imino ligand) at lower temperature. The former affords a lower molecular weight polymer and the latter higher molecular weight one. With raising polymerization temperature above 50 °C, the species I disappears and only species II exists in polymerization systems, resulting in a normal relation of molecular weight to polymerization temperature. From a kinetic study of the norbornene polymerization catalyzed by 1/MAO catalyst at 70 °C, the polymerization rate (R_p) can be expressed by the formulation: R_p = k[NBE]^1.93[Ni]^0.88. Moreover, the mechanism of the norbornene polymerization using the anilido–imino nickel complexes activated with MAO is also presented and discussed.     

Electrochemical reduction of cobalt and nickel complexes with ligands stabilizing metal in low oxidation state

Electrochemical reduction of cobalt(ii) complexes containing -acceptor ligands (L = bpy, Ph₂Ppy) proceeds through three consecutive reversible steps: one-electron transfer to form a more stable Co^IL complex, transfer of two electrons at more negative potentials to form an anionic [NiL]^– complex, and reduction of the ligand to the radical anion. The stability of the cobalt complexes with different ligands decreases in the series Ph₂Ppy > Ph₃P > bpy.     

对氟苯甲醛水杨酰腙镍(II)配合物的合成、表征及其晶体结构

A nickel(II) complex Ni(C₁₄H₁₀N₂O₂F)₂ was synthesized from p-fluorobenzaldehyde salicylhydrazone and Ni(CH₃COO)₂·4H₂O and crystallized by diffusion, the structure of which was characterized by IR spectrum, ¹H NMR, and X-ray single-crystal diffraction. The complex crystallizes in monoclinic space group C2/c with a=2.460 6(2) nm, b=0.774 1(1) nm, c=1.534 9(1) nm, β=122.300(1)°, and V=2.471 1(4), Z=8, D_c=1.541 g·cm^-3. We reported the IR, ¹H NMR, crystal structure. CCDC: 638652.     

Synthesis of Nickel Supported Catalysts for Hydrogen Production by Sol-Gel Method

SiO₂ and Al₂O₃ supported Ni catalysts were synthesized in the form of xerogels: the SiO₂ based materials were prepared starting from Ni propionate or glycolate salts and reacting them with tetraethoxysilane (TEOS) in propionic acid, Si(ethylene glycolate) or sodium silicate. The Al₂O₃ supported catalysts were prepared similarly from Ni propionate salts with Al iso-propoxide salts. Narrow metal particles and strong metal support interactions are observed in the sol-gel catalysts. The metal dispersion was higher for Al₂O₃ based materials than the SiO₂ ones and it deeply depends on the Ni precursor for the silica supported Ni. Wet impregnated oxides with similar Ni loading have higher metal surface area than those from sol-gel processing. The influence of surface differences on the catalytic activity of the materials was studied following the CH₄ and CO₂ reaction in dry reforming conditions by pulse reaction tests.