Efficient synthesis of Ir-polyoxometalate cluster using a continuous flow apparatus and STM investigation of its coassembly behavior on HOPG surface

Junyong Zhang, Shaoqing Chang, Bryan Suryanto, Chunhua Gong, Xianghua Zeng, Chuan Zhao, Qingdao Zeng, Jingli Xie

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10 Citations (Scopus)

Abstract

Taking advantage of a continuous-flow apparatus, the iridium(III)-containing polytungstate cluster K12Na2H2[Ir2Cl8P2W20O72]·37H2O (1) was obtained in a reasonable yield (13% based on IrCl3·H2O). Compound 1 was characterized by Fourier transform IR, UV-visible, 31P NMR, electrospray ionization mass spectrometry (ESI-MS), and thermogravimetric analysis measurements. 31P NMR, ESI-MS, and elemental analysis all indicated 1 was a new polytungstate cluster compared with the reported K14[(IrCl4)KP2W20O72] compound. Intriguingly, the successful isolation of 1 relied on the custom-built flow apparatus, demonstrating the uniqueness of continuous-flow chemistry to achieve crystalline materials. The catalytic properties of 1 were assessed by investigating the activity on catalyzing the electro-oxidation of ruthenium tris-2,2′-bipyridine [Ru(bpy)3]2+/3+. The voltammetric behavior suggested a coupled catalytic behavior between [Ru(bpy)3]3+/2+ and 1. Furthermore, on the highly oriented pyrolytic graphite surface, 1,3,5-tris(10-carboxydecyloxy) benzene (TCDB) was used as the two-dimensional host network to coassemble cluster 1; the surface morphology was observed by scanning tunneling microscope technique. "S"-shape of 1 was observed, indicating that the cluster could be accommodated in the cavity formed by two TCDB host molecules, leading to a TCDB/cluster binary structure.

Original languageEnglish
Pages (from-to)5585-5591
Number of pages7
JournalInorganic Chemistry
Volume55
Issue number11
DOIs
Publication statusPublished - 6 Jun 2016
Externally publishedYes

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