Platinum nanoparticles stabilized by an imidazolium-based cross-linked polymer (with chloride as the counteranion) efficiently catalyzed the oxidation of 5-hydroxymethylfurfural to form 2,5-furandicarboxylic acid in water under mild conditions with oxygen as the oxidant. This catalyst system is explored herein by varying the counteranion, that is, replacing chloride by BF4 - , PF6 - , bis(trifluoromethylsulfonyl)imide, hexanoate, or laurate anions, in the cationic polymer. The counteranion influences the structure of the obtained platinum nanoparticles, the surface electronic properties, and their catalytic activity. The highest reaction rates were obtained with the weakly nucleophilic bis(trifluoromethylsulfonyl)imide anion, which also favored platinum in the zero oxidation state, leading to complete conversion of the substrate and a high yield of 2,5-furandicarboxylic acid under mild conditions.

中文翻译：

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阴离子对离子聚合物负载的铂纳米颗粒催化剂对5-羟甲基糠醛氧化的影响。

由咪唑基交联聚合物（以氯为抗衡阴离子）稳定的铂纳米粒子在温和的条件下，以氧气为氧化剂，在水中有效地催化了5-羟甲基糠醛的氧化反应，形成了2,5-呋喃二甲酸。本文通过改变抗衡阴离子，即用阳离子聚合物中的BF4-，PF6-，双（三氟甲基磺酰基）酰亚胺，己酸根或月桂酸根阴离子代替氯来探索该催化剂体系。抗衡阴离子影响获得的铂纳米颗粒的结构，表面电子性质及其催化活性。弱亲核性双（三氟甲基磺酰基）酰亚胺阴离子获得了最高的反应速率，该阴离子也偏爱零氧化态的铂，