A synergistic {Cu₂-W₁₂O₄₀} catalyst with high conversion for homo-coupling of terminal alkynes

Jiang, Z.-G., Zeng, H.-M., Zhang, X., Tan, Y., Lan, Y.-Z., Wang, Y., Long, D.-L. , Cronin, L. and Zhan, C.-H. (2023) A synergistic {Cu₂-W₁₂O₄₀} catalyst with high conversion for homo-coupling of terminal alkynes. Inorganic Chemistry Frontiers, 10(4), pp. 1255-1261. (doi: 10.1039/D2QI02368G)

Abstract

By the strategy of replacing the H2O ligands in the “paddle wheel” shaped copper dimer Cu2(OAc)4(H2O)2 with polyoxometalate (POM) [H2W12O40]6− {W12O40} pro-ligands, a novel nano porous 2D network {[Cu2(OAc)4]2(W12O40)}n was obtained. The POM – copper centered redox reactions and stability of the compound were studied by cyclic voltammetry. Furthermore, the compound was found to be a super-efficient homogeneous catalyst (almost 100% conversion) in homo-coupling of terminal alkynes compared with its components and physical mixture under mild conditions with low amounts. The in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFTS) results clearly show the changes of alkyne substances in the catalytic process and the X-ray photoelectron spectroscopy (XPS) results reveal the electron transfer from {W12O40} to Cu(II) to promote the C–H activation step during the homo-coupling of terminal alkynes. The synergistic Cu(II)-POM catalytic mechanism was proposed.

• Item Type: Articles
• Additional Information: THe authors are thankful for the support of this work from the National Natural Science Foundation of China (NSFC 21801226), the Natural Science Foundation of Zhejiang Province (LY20B010002 and LQ22B010002) and the Zhejiang Normal University Fund.
• Keywords: Inorganic chemistry.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Long, Dr Deliang and Cronin, Professor Lee
• Authors: Jiang, Z.-G., Zeng, H.-M., Zhang, X., Tan, Y., Lan, Y.-Z., Wang, Y., Long, D.-L., Cronin, L., and Zhan, C.-H.
• College/School: College of Science and Engineering > School of Chemistry
• Journal Name: Inorganic Chemistry Frontiers
• Publisher: Royal Society of Chemistry
• ISSN: 2052-1553
• ISSN (Online): 2052-1553
• Published Online: 21 December 2022
• Copyright Holders: Copyright © 2023 Partner Organisations
• First Published: First published in Inorganic Chemistry Frontiers 10(4): 1255-1261
• Publisher Policy: Reproduced in accordance with the publisher copyright policy