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Published in Luis Liz-Marzán, Colloidal Synthesis of Plasmonic Nanometals, 2020
Stefanos Mourdikoudis, Luis M. Liz-Marzán
Colloidal semiconductor nanocrystals can also be synthesized in the presence of OAm. For example, uniformly sized Ag2S nanocrystals were prepared by pyrolysis using AgNO3 and S powder as precursors and OAm as solvent, surfactant, and reductant. These particles were proposed for application as SERS substrates.123 A similar heat-up protocol using OAm was employed for the synthesis of CdS nanorods and CdSe nanoparticles.124 Highly luminescent CdSe NPs were produced using OAm as a coligand whose concentration affected the reaction kinetics and the final particle size.125 Elemental sulfur and copper acetylacetonate were thermally treated in OAm to obtain monodisperse hexagonal Cu2S nanoplates. These materials were considered as potential solutions for application in fields such as solar cells, photoelectric devices, and colloidal photonic crystals.126 The combination of Pb(OAc)2, dodecanethiol, and OAm has been recently reported to yield PbS nanocrystals with polyhedral or truncated-cubic shape depending on the reaction temperature.127PbS NPs were also prepared by mixing and heating initially prepared PbCl2-OAm and sulfur-OAm solutions.128 PbTe nanocubes were prepared by mixing OAm/OAc surfactants with Pd-acetate, followed by hot-injection of trioctylphosphine telluride at 200°C.129 ZnS nanostructures with different morphologies were also obtained by heating a mixture of OAm, zinc stearate, and sulfur precursor at 280°C. The kind of precursor used (sulfur powder, thiourea, dodecanethiol) determined the final particles morphology (nanorods, dot-shaped, and quasi-cubic-shaped, respectively).130 Reagents such as TOP, octenoic acid, and dichlorobenzene were added for the production of high-quality Ni3S4 and CuS nanocrystals with OAm as the reaction medium.131 Hyeon’s group reported a generalized strategy for the synthesis of semiconducting metal sulfide NPs (PbS, ZnS, CdS, and MnS) with various sizes and shapes. This procedure initially involved the formation of a metal-oleylamine complex, by dissolution of metal chloride with OAm at an intermediate temperature, and the final nanomaterials were obtained after injecting elemental sulfur and further heating.132 Thomson et al. used NMR techniques to study the sulfur-oleylamine interactions during the synthesis of sulfide NPs. They showed that thioamides can be also used as S precursors due to their rapid kinetics.133
Synthesis and antioxidant activity of some new thioglycoluril derivatives
Published in Journal of Sulfur Chemistry, 2019
Imene Boudebouz, Salah Arrous, Evgenii Plotnikov, Olesya Voronova, Abdigali Bakibaev
Two active centers determine the chemical and physical properties of thioamides. One of them is attributed to the nitrogen atom with an unshared electron pair, the other one, to the sulfur atom. In most cases, substitution on either the nitrogen or the sulfur atom markedly changes the properties of these compounds. The class of thioamides includes in fact a wide variety of relatively readily available compounds. Owing to their ability to react in most cases with both electrophiles and nucleophiles, thioamides and their functionalized derivatives may be considered as highly versatile reagents. For those reasons they are still gaining in importance as useful synthons in the synthesis of heterocyclic compounds, including regio- and stereoselective synthesis of natural products [1,2].
Mixed bases mediated synthesis of thioamides in water
Published in Journal of Sulfur Chemistry, 2020
Jiao Li, Xuanhe Ren, Ganzhong Li, Helong Liang, Yajie Zhao, Zhiwu Wang, Heng Li, Bingxin Yuan
Despite their great advances, those methods are predominantly conducted with large excess of amides and require certain oxidants. Moreover, only N-alkylformamides (mostly DMF, DMAc or N-formylmorpholine) could be converted to the desired thioamide compounds. Hence, our research aimed at the development of a more versatile strategy using the green solvent while avoiding the usage of an external oxidant. In this article, we disclose a mixed bases mediated synthesis of thioamides from N-alkyl or N-arylamides, elemental sulfur and arylaldehydes in water.