Gas-phase reactions of iron(1-) and cobalt(1-) with simple thiols, sulfides, and disulfides by Fourier-transform mass spectrometry
作者:L. Sallans、K. R. Lane、B. S. Freiser
DOI:10.1021/ja00185a013
日期:1989.2
products, H-Fesup minus}}-SH and Fesup minus}}-SH. Some of the thermochemical data derived from this study include Ddegree}(Msup minus}}-S) > 103 kcal/mol and Ddegree}(Msup minus}}-SH) = 83 plus minus}9 kcal/mol. Finally, a brief survey of the reactivity of Vsup minus}}, Crsup minus}}, and Mosup minus}} with selected organosulfur compounds is also reported. 79 refs., 3 figs., 7 tabs
Cluster Synthesis via Ligand-Arrested Solid Growth: Triethylphosphine-Capped Fragments of Binary Metal Chalcogenides
作者:Nathan R. M. Crawford、Allan G. Hee、Jeffrey R. Long
DOI:10.1021/ja027862f
日期:2002.12.1
for synthesizing molecular fragments of binary solids is demonstrated through application to selected transition metal chalcogenides. Employing a metal atom reactor, the solids are evaporated with a tungsten heating boat, and the resulting vapor is co-condensed with triethylphosphine. Major cluster products identified from a survey of first-row transition metal sulfides include the known species Cr6S8(PEt3)6
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。
Ce<sub>53</sub>Fe<sub>12</sub>S<sub>90</sub>X<sub>3</sub> (X = Cl, Br, I): The First Rare-Earth Transition-Metal Sulfide Halides
作者:Allison M. Mills、Michael Ruck
DOI:10.1021/ic0521372
日期:2006.6.1
The compounds Ce53Fe12S90X3 (X = Cl, Br, I), which represent the first examples of rare-earthtransition-metalsulfidehalides, were prepared using the reactive-flux method, through reaction of Ce2S3, FeS, or Fe and S in a CeX3 flux at 1320 K. Their structures were determined by single-crystal X-ray diffraction. The compounds are isostructural, crystallizing in the trigonal space group Rm with Z =
Materials capable of gasochromic behavior are still rare. In this paper, amorphous gasochromic hybrid silica material containing phosphomolybdic acid (PMo12) is prepared by the sol–gel technique. The structure and properties of the material are investigated by cyclic voltammetry, thermal gravimetric analysis, FT-IR spectra, X-ray diffraction, UV-Vis spectra and X-ray photoelectron spectra. The structural integrity of phosphomolybdic acid has been preserved after incorporation into the porous silica framework. Furthermore, the PMo12–SiO2 hybrid material shows sensing activity for H2S and SO2 gases at room temperature based on the color change.