Yamada Yusuke, Nishida Miho, Nakabayashi Tatsuya, Nakazono Takashi, Lin Hanghao, Chen Pengru, Tamura Masazumi
Department of Chemistry and Bioengineering, Graduate School of Engineering, Osaka Metropolitan University, Osaka 558-8585, Japan.
Center for Artificial Photosynthesis, Osaka Metropolitan University, Osaka 558-8585, Japan.
Dalton Trans. 2024 Nov 5;53(43):17620-17628. doi: 10.1039/d4dt02386b.
Ir-Ni alloys supported on SiO have been reported to show high catalytic activity for styrene hydrogenation; however, precise control of compositions and sizes of the Ir-Ni alloys is difficult when conventional metal salts are used as precursors. Furthermore, the concomitant formation of unalloyed Ni nanoparticles disturbs quantitative discussion about Ir-Ni alloy compositions. We report herein a preparation method of Ir-Ni alloys with precisely controlled compositions on SiO using Ni(NO) and an Ir complex possessing CN ligands, [Ir(CN)] or [Ir(ppy)(CN)] (ppy = 2-phenylpyridine), as precursors. The formation of cyano-bridged coordination polymers involving Ir and Ni promotes the formation of Ir-Ni alloys, whose compositions are virtually the same as expected from the amounts of Ir and Ni used for the preparation, after heat treatment under H. The use of [Ir(ppy)(CN)] as the precursor resulted in the formation of smaller Ir-Ni alloy particles than those with [Ir(CN)] related to the structures of the formed coordination polymers.
据报道，负载在SiO上的Ir-Ni合金对苯乙烯氢化反应具有高催化活性；然而，当使用传统金属盐作为前驱体时，难以精确控制Ir-Ni合金的组成和尺寸。此外，未合金化的Ni纳米颗粒的同时形成干扰了关于Ir-Ni合金组成的定量讨论。我们在此报告一种在SiO上制备组成精确可控的Ir-Ni合金的方法，该方法使用Ni(NO)和具有CN配体的Ir配合物[Ir(CN)]或[Ir(ppy)(CN)]（ppy = 2-苯基吡啶）作为前驱体。涉及Ir和Ni的氰基桥连配位聚合物的形成促进了Ir-Ni合金的形成，在H气氛下热处理后，其组成实际上与制备中使用的Ir和Ni的量预期的相同。使用[Ir(ppy)(CN)]作为前驱体导致形成的Ir-Ni合金颗粒比使用[Ir(CN)]形成的颗粒更小，这与形成的配位聚合物的结构有关。
