The transition from molecules to solids: molecular syntheses of Ni9Te6(PEt3)8, Ni20Te18(PEt3)12 and NiTe
作者:J. G. Brennan、T. Siegrist、S. M. Stuczynski、M. L. Steigerwald
DOI:10.1021/ja00208a023
日期:1989.12
report the isolation and crystallographic characterization of two interned intermediates: the clusters Nisub 9}Tesub 6}(PEtsub3})sub 8} and Nisub 20}Tesub 18}(PEtsub3})sub12}.
三烷基膦碲化物可用作元素碲的有机金属等价物,用于制备固态金属碲化物。碲化膦效用的初步迹象是它们可逆地沉积零价碲的能力。本通讯描述了固态化合物碲化镍 NiTe 的合成,使用这些有机金属试剂作为 Ni 和 Te 的来源。此外,我们报告了两个中间体的分离和晶体学表征:簇 Nisub 9}Tesub 6}(PEtsub 3})sub 8} 和 Nisub 20}Tesub 18}( PEtsub 3})sub 12}。
New criteria for the applicability of combustion synthesis: The investigation of thermodynamic and kinetic processes for binary Chemical Reactions
Combustion synthesis is a novel technique that utilizes the exothermic heat of a chemical reaction to maintain the reaction and to rapidly prepare materials. But, hitherto, none of unified criterion for the validation of combustion synthesis has been proposed. Herein, we proposed the conditions need to be met. In terms of kinetics, at the adiabatic temperature (Tad), the diffusion distance of atoms
燃烧合成是一种利用化学反应的放热来维持反应并快速制备材料的新技术。但是,迄今为止,尚未提出用于验证燃烧合成的统一标准。在此,我们提出了需要满足的条件。就动力学而言,在绝热温度(T ad)下,原子的扩散距离(升Ť广告)在0.1 s内应大于反应物的粒径(d), 那是, 升Ť广告≥d。对于满足T ad / T m,L的系统≥1(其中T m,L是反应物的低熔点成分的熔点),液相的存在将原子的扩散距离从纳米显着增加到数十微米,从而成为标准升Ť广告≥d简化为T ad / T m,L≥在大多数情况下为1。在热力学方面,系统需要确保反应成分处于激活状态,即T ad / T m,H ≥0.7,其中T m,H是高熔点组分的熔点。本研究提出的SHS反应标准进一步提高了对SHS反应的理论理解,并为探索二元和多组分化合物的超快合成提供了指导。
Novel magnetic nickel telluride nanowires decorated with thorns: synthesis and their intrinsic peroxidase-like activity for detection of glucose
作者:Lijuan Wan、Jinhuai Liu、Xing-Jiu Huang
DOI:10.1039/c4cc06684g
日期:——
Highly sensitive and selective colorimetric detection of glucose was performed using the peroxidase-like activity of NiTe TNWs with excellent magnetic performance.
Nickel(ii) complexes of heterodichalcogenido and monochalcogenido imidodiphosphinate ligands: AACVD synthesis of nickel ditelluride
作者:Stuart D. Robertson、Tristram Chivers、Javeed Akhtar、Mohammad Afzaal、Paul O'Brien
DOI:10.1039/b814065k
日期:——
The reaction of two equivalents of (TMEDA)Li[(EPiPr2)(TePiPr2)N] (E = S, Se) with NiBr2(DME) in THF at 23 °C yields homoleptic complexes of heterodichalcogenido PNP ligands Ni[(EPiPr2)(TePiPr2)N]2 (2, E = S; 3, E = Se). Similarly, the complexes Ni[(PiPr2)(EPiPr2)N]2 (4, E = Se; 5, E =Te) are obtained by in situ deprotonation of the neutral monochalcogenides EPiPr2NP(H)iPr2 (E = Se, Te) with nBuLi in THF at −78 °C followed by addition of NiBr2(DME). The complexes 2–5 have been characterised by multinuclear (1H, 31P, 77Se and 125Te) NMR spectroscopy in solution and by X-ray crystallography in the solid state, the results of which show that they all exist as the square planar, trans isomers. Aerosol-assisted chemical vapour deposition (AACVD) of Ni[(SePiPr2)(TePiPr2)N]2 yields crystalline Ni0.51Te films at 450–500 °C, which were analysed by X-ray powder diffraction (XRPD), scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS).
Solid state synthesis of binary metal chalcogenides
作者:Graham A. Shaw、Daniel E. Morrison、Ivan P. Parkin
DOI:10.1039/b101645h
日期:——
Solid state reaction of metal halides MXn (n = 1 or 2) with stoichiometric amounts of sodium chalcogenide (Na2S2 or Na2E where E = S, Se or Te) at 300 °C for 48 h in evacuated ampoules affords a range of transition and main-group metal chalcogenides: ME2 (M = Fe or Co, E = S or Te); M(1 − x)E (M = Fe or Co, E = S); Ag2E (E = S, Se or Te), Ni(1 − x)E (E = S, Se or Te); NiS2, MnS, FeSe, SnSe and SnTe along with co-formed salt. Washing of the highly sintered, fused product mixture with water resulted in isolation of crystalline binary chalcogenides, typically of a single phase in good yield (90%). The products were characterised by X-ray powder diffraction, scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDXA) and i
nfrared spectroscopy.
金属卤化物 MXn(n = 1 或 2)与一定量的氢化钠(Na2S2 或 Na2E,其中 E = S、Se 或 Te)在 300 °C、48 小时的真空安瓿瓶中发生固态反应,生成一系列过渡族和主族金属氢化物:ME2(M = Fe 或 Co,E = S 或 Te);M(1 - x)E(M = Fe 或 Co,E = S);Ag2E(E = S、Se 或 Te),Ni(1 - x)E(E = S、Se 或 Te);NiS2、MnS、FeSe、SnSe 和 SnTe 以及共形盐。用水清洗高度烧结、熔融的产品混合物,可分离出结晶的二元钙钛矿,通常为单相,产率高(90%)。通过 X 射线粉末衍射、扫描电子显微镜(SEM)、能量色散 X 射线分析(EDXA)和红外光谱对产品进行了表征。