AUTHOR=Panagiotakis Stylianos , Landrou Georgios , Nikolaou Vasilis , Putri Anisa , Hardré Renaud , Massin Julien , Charalambidis Georgios , Coutsolelos Athanassios G. , Orio Maylis 

TITLE=Efficient Light-Driven Hydrogen Evolution Using a Thiosemicarbazone-Nickel (II) Complex

JOURNAL=Frontiers in Chemistry

VOLUME=7

YEAR=2019

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2019.00405

DOI=10.3389/fchem.2019.00405

ISSN=2296-2646

ABSTRACT=<p>In the following work, we carried out a systematic study investigating the behavior of a thiosemicarbazone-nickel (II) complex (<bold>NiTSC-OMe</bold>) as a molecular catalyst for photo-induced hydrogen production. A comprehensive comparison regarding the combination of three different chromophores with this catalyst has been performed, using [<bold>Ir(ppy)</bold><sub><bold>2</bold></sub><bold>(bpy)]PF</bold><sub><bold>6</bold></sub>, <bold>[Ru(bpy)</bold><sub><bold>3</bold></sub><bold>]Cl</bold><sub><bold>2</bold></sub> and [<bold>ZnTMePy]PCl</bold><sub><bold>4</bold></sub> as photosensitizers. Thorough evaluation of the parameters affecting the hydrogen evolution experiments (i.e., concentration, pH, solvent nature, and ratio), has been performed in order to probe the most efficient photocatalytic system, which was comprised by <bold>NiTSC-OMe</bold> and [<bold>Ir(ppy)</bold><sub><bold>2</bold></sub><bold>(bpy)]PF</bold><sub><bold>6</bold></sub> as catalyst and chromophore, respectively. The electrochemical together with the photophysical investigation clarified the properties of this photocatalytic system and allowed us to propose a possible reaction mechanism for hydrogen production.</p>