Red Absorbing Cyclometalated Ir(III) Diimine Photosensitizers Competent for Hydrogen Photocatalysis
作者:Simon De Kreijger、Olivier Schott、Ludovic Troian-Gautier、Emilie Cauët、Garry S. Hanan、Benjamin Elias
DOI:10.1021/acs.inorgchem.1c03727
日期:2022.4.4
Two new cyclometalated Ir(III) diimine complexes were used as photosensitizers for homogeneous hydrogen evolution reaction (HER). These complexes were characterized by electrochemistry, ultraviolet–visible absorption, time-resolved and steady-state photoluminescence spectroscopy as well as by theoretical methods. The metal–ligand-to-ligand charge transfer character of their lowest excited state was
两种新的环金属化 Ir(III) 二亚胺配合物被用作均相析氢反应 (HER) 的光敏剂。通过电化学、紫外-可见吸收、时间分辨和稳态光致发光光谱以及理论方法对这些配合物进行了表征。在 [Co(dmgH) 2 ( py )Cl] 作为析氢催化剂、三乙醇胺作为牺牲电子供体和 HBF 4作为质子源。在优化的实验条件下,两种配合物在超过 90 小时的时间内都显示出 HER,在蓝光、绿光和红光照射下,转换数分别达到 11,650、10,600 和 174 mol H2 mol PS –1 . 与大多数先前描述的同类系统相比,这两种复合物都显示出比 HER 更高的稳定性和效率。