Abstract
A high surface area and the possibility of high charge separation and transportability make the two-dimensional (2D) nanomaterials very special in many applications, particularly in the field of catalysis. The usefulness of 2D nanomaterial is positively demonstrated in this study by employing it as an efficient heterogeneous catalyst in Sonogashira cross-coupling reaction, where the later one is well known for the formation of carbon–carbon bonds. 2D nanosheets of CuCo2S4 are synthesized using a hydrothermal synthesis and the average thickness of the sheets is found to be in the range of 10−15 nm. The transparent nanosheets are interconnected to form thick sheets and then aggregated to form a highly open three-dimensional hierarchical structure. This study explores the Sonogashira reaction very efficiently in water/ethanol at room temperature using hydrothermally synthesized CuCo2S4 nanosheets as catalyst for the C-C coupling reaction for the first time. The developed method is found to be economic, green, high yields, low catalyst loading and reusability of the catalysts. This present CuCo2S4 nanosheet heterogeneous catalyst afford the Sonogashira coupling of various aryl halides with terminal alkynes, giving a variety of aryl acetylenes in excellent yields and can be recovered by a simple filtration and reused for at least ten consecutive reactions with almost constant yield and activity.
Highlights
IntroductionTwo-dimensional nanosheets possess a specific perspective in nanoscience and nanotechnology
Over the past decades, two-dimensional nanosheets possess a specific perspective in nanoscience and nanotechnology
The crystalline phase purity of the assynthesized material was characterized by using powder X-ray measurements
Summary
Two-dimensional nanosheets possess a specific perspective in nanoscience and nanotechnology. Remarkable development has been seen in 2D materials due to their potential applications in gas storage, sensing, catalysis, electronic applications like supercapacitors, batteries, and electrolyzer cell and hydrogen storage applications (Tan and Zhang, 2015; Chauhan et al, 2017a; Antil et al, 2019). The 2D materials which have individual properties like pure crystalline nature, tunable thickness, and extraordinary mechanical-thermal stability with high charge conductivity endowed them vital for various catalytic reactions. The planar nature of nanosheets facilitates easy adsorption and removal of reactant species which enhance their. Because of unique features and outstanding performances, 2D nanomaterials are very popular and extensive research efforts have been dedicated for their development and exploration of their properties like lateral size dependent transport, crystal phase, defects, layer thickness, and surface properties (Mika et al, 2018). Still synthetic procedures for the 2D materials with desirable topographies is somewhat challenging
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