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首页> 外文期刊>Chemistry: A European journal >Synthesis, characterisation and application of iridium(III) photosensitisers for catalytic water reduction
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Synthesis, characterisation and application of iridium(III) photosensitisers for catalytic water reduction

机译：用于催化减水的铱（III）光敏剂的合成，表征和应用

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The synthesis of novel, monocationic iridium(III) photosensitisers (Ir-PSs) with the general formula [Ir~(III)(C^N)_2(N^N)]~+ (C^N: cyclometallating phenylpyridine ligand, N^N: neutral bidentate ligand) is described. The structures obtained were examined by cyclic voltammetry, UV/Vis and photoluminescence spectroscopy and X-ray analysis. All iridium complexes were tested for their ability as photosensitisers to promote homogeneously catalysed hydrogen generation from water. In the presence of [HNEt _3][HFe_3(CO)_(11)] as a water-reduction catalyst (WRC) and triethylamine as a sacrificial reductant (SR), seven of the new iridium complexes showed activity. [Ir(6-iPr-bpy)(ppy)_2]PF _6 (bpy: 2,2′-bipyridine, ppy: 2-phenylpyridine) turned out to be the most efficient photosensitiser. This complex was also tested in combination with other WRCs based on rhodium, platinum, cobalt and manganese. In all cases, significant hydrogen evolution took place. Maximum turnover numbers of 4550 for this Ir-PS and 2770 for the Fe WRC generated in situ from [HNEt _3][HFe_3(CO)_(11)] and tris[3,5- bis(trifluoromethyl)phenyl]phosphine was obtained. These are the highest overall efficiencies for any Ir/Fe water-reduction system reported to date. The incident photon to hydrogen yield reaches 16.4 % with the best system.
机译：通式为[Ir〜（III）（C ^ N）_2（N ^ N）]〜+（C ^ N：环金属化苯基吡啶配体N的新型单阳离子铱（III）光敏剂（Ir-PSs）的合成（N：中性双齿配体）被描述。通过循环伏安法，UV / Vis，光致发光光谱法和X射线分析检查获得的结构。测试了所有铱配合物作为光敏剂的能力，以促进从水中均匀催化的氢气生成。在[HNEt _3] [HFe_3（CO）_（11）]作为减水催化剂（WRC）和三乙胺作为牺牲性还原剂（SR）的存在下，七个新的铱络合物显示出活性。结果表明，[Ir（6-iPr-bpy）（ppy）_2] PF _6（bpy：2,2'-联吡啶，ppy：2-苯基吡啶）是最有效的光敏剂。还对该复合物与其他基于铑，铂，钴和锰的WRC进行了测试。在所有情况下，都有大量的氢气逸出。从[HNEt _3] [HFe_3（CO）_（11）]和三[3,5-双（三氟甲基）苯基]膦原位生成的Ir-PS的最大周转数为4550，Fe WRC的最大周转数为2 。这些是迄今为止报告的任何Ir / Fe减水系统的最高总体效率。采用最佳系统，入射光子到氢气的产率达到16.4％。

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