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Issue 42, 2016
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Gold nanoparticles supported by imidazolium-based porous organic polymers for nitroarene reduction

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Abstract

Two imidazolium-based porous organic polymers (Im-POP-1 and Im-POP-2) were synthesized through the Yamamoto reaction of different molar ratios of 1,3-bis(4-bromophenyl)imidazolium bromide and tetrakis(4-bromophenyl)methane, subsequent anion exchange with HAuCl4 and reduction with NaBH4 produced well-dispersed gold nanoparticles (NPs), Au@Im-POP-1 and Au@Im-POP-2. These NPs possess a small size and narrow size distribution, their application in the reduction of nitroarenes was evaluated, and the reduction process was tracked by 13C NMR experiments for reaction mechanism studies. In comparison with gold NPs supported by a non-ionic analogue from the Yamamoto reaction of tetrakis(4-bromophenyl)methane (Au@POP-TPM), Au@Im-POP-2 exhibits high catalytic activity, good selectivity of aniline and superior recyclability in nitrobenzene reduction. The gold NPs in Au@Im-POP-2 increase slightly after four consecutive reaction runs, while an apparent agglomeration of NPs in Au@POP-TPM was observed after the second run. This research provides a new type of support for the stabilization of gold NPs and for the improvement of catalytic performances.

Graphical abstract: Gold nanoparticles supported by imidazolium-based porous organic polymers for nitroarene reduction

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Publication details

The article was received on 01 Aug 2016, accepted on 13 Sep 2016 and first published on 14 Sep 2016


Article type: Paper
DOI: 10.1039/C6DT03050E
Citation: Dalton Trans., 2016,45, 16896-16903
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    Gold nanoparticles supported by imidazolium-based porous organic polymers for nitroarene reduction

    Y. Su, X. Li, Y. Wang, H. Zhong and R. Wang, Dalton Trans., 2016, 45, 16896
    DOI: 10.1039/C6DT03050E

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