- Single-source approach to cubic FeS2 crystallites and their optical and electrochemical properties
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Cubic FeS2 crystallites have been synthesized via a single-source approach using iron diethyldithiocarbamate as precursor under hydrothermal conditions. The sample is characterized by XRD, IR, TEM, and FESEM. The optical properties of the as-prepared FeS2 reveal that there exists a red shift compared with that of bulk materials. Meanwhile, the electrochemical properties of FeS2 demonstrate that it delivers a large discharge capacity, which might find possible application as an electrode material in lithium cells. It is also found that the reaction temperature is of importance to the formation of cubic FeS2 crystallites.
- Chen, Xiangying,Wang, Zhenghua,Wang, Xiong,Wan, Junxi,Liu, Jianwei,Qian, Yitai
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- Iron pyrite nanocrystal inks: Solvothermal synthesis, digestive ripening, and reaction mechanism
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Colloidal iron pyrite nanocrystals (or FeS2 NC inks) are desirable as active materials in lithium ion batteries and photovoltaics and are particularly suitable for large-scale, roll-to-roll deposition or inkjet printing. However, to date, FeS2 NC inks have only been synthesized using the hot-injection technique, which requires air-free conditions and may not be desirable at an industrial scale. Here, we report the synthesis of monodisperse, colloidal, spherical, and phase-pure FeS2 NCs of 5.5 ± 0.3 nm in diameter via a scalable solvothermal method using iron diethyldithiocarbamate as the precursor, combined with a postdigestive ripening process. The phase purity and crystallinity are determined using X-ray diffraction, transmission electron microscopy, far-infrared spectroscopy, and Raman spectroscopy techniques. Through this study, a hypothesis has been verified that solvothermal syntheses can also produce FeS2 NC inks by incorporating three experimental conditions: high solubility of the precursor, efficient mass transport, and sufficient stabilizing ligands. The addition of ligands and stirring decrease the NC size and led to a narrow size distribution. Moreover, using density functional theory calculations, we have identified an acid-mediated decomposition of the precursor as the initial and critical step in the synthesis of FeS2 from iron diethyldithiocarbamate.
- Yoder, Tara S.,Cloud, Jacqueline E.,Leong, G. Jeremy,Molk, Doreen F.,Tussing, Matthew,Miorelli, Jonathan,Ngo, Chilan,Kodambaka, Suneel,Eberhart, Mark E.,Richards, Ryan M.,Yang, Yongan
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- Method of treating cancer using dithiocarbamate derivatives
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The invention encompasses neutral dithiocarbamate metal compounds and methods of treating cancer using such compounds, along with methods for sensitizing AIDS/HIV patients to anti-retroviral therapy by blocking the P-glycoprotein membrane toxin extrusion pump using such compounds. Compounds inhibit the growth of cancer cells of a variety of cell types. A method is presented for using the neutral compounds disclosed herein, amongst other uses disclosed herein, to reduce tumor growth, and to potentiate the effect of other anticancer agents. The invention also encompasses pharmaceutical compositions comprising the neutral compounds and a pharmaceutically acceptable excipient, diluent, solubilizer, solvent, adjuvant or carrier, or a mixture thereof.
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- THE DIRECT ELECTROCHEMICAL SYNTHESIS OF DIALKYLDITHIOCARBAMATE AND DIETHYLDITHIOPHOSPHATE COMPLEXES OF MAIN GROUP AND TRANSITION METALS
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Dialkyldithiocarbamate derivatives (R2NCS2)nM of a number of metals (M=Fe, Co, Ni, Cu, Ag, Zn, Cd, In, Tl) have been synthesised in good yield by electrochemical oxidation of appropriate sacrificial anodes in non-aqueous solutions of either the corresponding tetraalkylthiuran disulphide (R2NCS2)2 (R=Me, Et) or a mixture of carbon disulphide plus the secondary amine R2NH (R=Et, i-Pr; R2NH=piperidine).Similar experiments with solutions of (EtO)2P(S)SH (=HL) gave MLn* derivatives (M=Fe, Co, Ni, Cu, Ag, Au, Zn, Cd, Hg, Ga, In, Tl) while in the presence of HL+1,10-phenanthroline, MLn.phen derivatives were obtained for M=V, Mn, Fe, Co, Zn, and Ga.
- Geloso, Corrado,Kumar, Rajesh,Lopez-Grado, Jaime Romero,Tuck, Dennis G.
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p. 928 - 932
(2007/10/02)
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