A synergistic {Cu2-W12O40} catalyst with high conversion for homo-coupling of terminal alkynes. Issue 4 (10th January 2023)

• Record Type: Journal Article
• Authors: Jiang, Zhan-Guo; Zeng, Hui-Min; Zhang, Xiangyu; Tan, Yuan; Lan, You-Zhao; Wang, Yu; Long, De-Liang; Cronin, Leroy; Zhan, Cai-Hong
• Is Part Of: Inorganic chemistry frontiers. Volume 10:Issue 4(2023
• Page Start: 1255
• Page End: 1261
• Publication Date: 2023-01-10
• Subjects: Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/d2qi02368g
• Languages: English
• ISSNs: 2052-1553

Abstract

Abstract : The 2D {[Cu2 (OAc)4 ]2 (W12 O40 )} n network with unique Cu-POM synergistic cooperation to lead alkyne C–H activation is a super efficient catalyst with high conversion in homo-coupling of terminal alkynes. Abstract : By the strategy of replacing the H2 O ligands in the "paddle wheel" shaped copper dimer Cu2 (OAc)4 (H2 O)2 with polyoxometalate (POM) [H2 W12 O40 ] 6− {W12 O40 } pro-ligands, a novel nano porous 2D network {[Cu2 (OAc)4 ]2 (W12 O40 )} 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 {W12 O40 } 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.