Synthesis of Arylsulfonyl Benzenediols by Sandwich Type Polyoxometalate Intercalated MgAl-Layered Double Hydroxides in W
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Synthesis of Arylsulfonyl Benzenediols by Sandwich Type Polyoxometalate Intercalated MgAl‑Layered Double Hydroxides in Water at Room Temperature Shamila Rouhani1 · Azra Ghiasi Moaser2 · Roushan Khoshnavazi2 · Titus A. M. Msagati1,3 Received: 20 March 2020 / Accepted: 9 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract This paper reports on the preparation of simple and cost-effective nanocomposite that involved intercalation of sandwich-type polyoxometalate (STPOM) anion [(OCe)3(PW9O34)2]12− into Mg/Al layered double hydroxides (donated as M g3Al–Ce3W18) using an ion-exchange method. The catalytic performance of nanocomposite catalyst was examined in green synthesis of aryl sulfonyl benzene diols via oxidative coupling between 1,2-benzenediols and sodium benzenesulfinates under mild green condition (; in water at room temperature) with good yields (63–75%). Besides, the nanocomposite catalyst exhibited excellent reusability up to five subsequent runs. SEM, EDX and BET were employed to characterize the as-fabricated nanocomposite. Keywords Polyoxometalate · Layered double hydroxide · Arylsulfonyl benzenediols · Nanocomposite · Intercalation
1 Introduction Over the last few decades, much more attention has been paid to the development of environmentally benign and ecofriendly processes and catalysts in the chemistry domain [1, 2]. Recently, more attempts have been made to design and use of the catalysts immobilized on various nano-sized supports possessing high performance of catalytic activity and stability [3]. Polyoxometalates (POMs) belong to a large class of nanosized anionic metal oxide that contain different early transition metals, such as W, Mo, V, … at their highest oxidation states. Recently, they have been explored in a wide range of applications including catalysis, medicine, pharmaceutical industry and electronics owing to their amazing structures * Azra Ghiasi Moaser [email protected] 1
Nanotechnology and Water Sustainability Research (NanoWS) Unit, College of Science, Engineering and Technology, University of South Africa, Johannesburg 1709, South Africa
2
Department of Chemistry, University of Kurdistan, P.O. Box 66135‑416, Sanandaj, Iran
3
School of Life Sciences and Bio‑Engineering, The Nelson Mandela African Institution of Science and Technology, P O Box 447, Tengeru, Arusha, United Republic of Tanzania
such as variable composition, sizes, rich redox chemistry and charge distribution [4]. In the midst of them, POMs’ application in catalysis has been of great interest due to their well-defined composition and structure, high thermal stability, adjustable acidity, redox activity, oxidative properties and high efficiency for oxidation and hydration reactions [5]. Therefore, the homogenous POMs catalyst as a green, highly efficient and environmentally pollution-free has been employed in a large number of catalytic oxidation reactions [6–10]. However, the main problems regarding the application of POMs is their low surface area (≤ 10 m 2 g−
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