Cobalt, nickel, and iron complexes of 8-hydroxyquinoline-di(2-picolyl)amine for light-driven hydrogen evolution,Dalton Transactions

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Cobalt, nickel, and iron complexes of 8-hydroxyquinoline-di(2-picolyl)amine for light-driven hydrogen evolution
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-11-03 00:00:00 , DOI: 10.1039/c7dt02666h
Nadia Alessandra Carmo dos Santos _{1,

2,

3,

4} , Mirco Natali _{5,

6,

7,

8,

9} , Elena Badetti _{1,

2,

3,

4} , Klaus Wurst _{10,

11,

12,

13,

14} , Giulia Licini _{1,

2,

3,

4} , Cristiano Zonta _{1,

2,

3,

4}

Affiliation

Novel cobalt, nickel, and iron complexes based on the pentadentate 8-hydroxyquinoline-di(2-picolyl)amine ligand were synthesized and thoroughly characterized. X-ray structures of both the cobalt and iron complexes were also obtained, showing the tendency to adopt a pseudo-octahedral geometry by coordination of an additional sixth ligand. These metal complexes were then studied as potential hydrogen-evolving catalysts (HECs) under both electrochemical and light-driven conditions. In particular, two different photochemical systems were tested involving either Ru(bpy)₃²⁺/ascorbic acid or Ir(ppy)₂(bpy)⁺/TEA sensitizer/sacrificial donor couples. The electrochemical results showed that these metal complexes may behave as competent HECs. However, under photochemical conditions, only the cobalt compound displayed substantial hydrogen-evolving activity in both ruthenium- and iridium-based systems. The nickel and iron complexes, on the other hand, exhibited appreciable photocatalytic activity only in the iridium-based photochemical system, while showing negligible hydrogen evolution ability when employed in the ruthenium-based one.

中文翻译：

8-羟基喹啉-二（2-吡啶甲基）胺的钴，镍和铁配合物，用于光驱氢

合成了基于五齿的8-羟基喹啉-二（2-吡啶甲基）胺配体的新型钴，镍和铁配合物，并对其进行了全面表征。还获得了钴和铁配合物的X射线结构，显示出通过与另外的第六配位体配位而采用伪八面体几何形状的趋势。然后研究了这些金属配合物在电化学和光驱动条件下作为潜在的析氢催化剂（HEC）。特别是，测试了两种不同的光化学体系，涉及Ru（bpy）₃²⁺ /抗坏血酸或Ir（ppy）₂（bpy）⁺/ TEA敏化剂/牺牲供体夫妇。电化学结果表明，这些金属络合物可作为有效的HEC。但是，在光化学条件下，只有钴化合物在基于钌和铱的体系中均表现出显着的析氢活性。另一方面，镍和铁配合物仅在铱基光化学体系中显示出相当大的光催化活性，而在钌基光化学体系中显示出可忽略的氢释放能力。

更新日期：2017-11-16

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