title: Supramolecular activation of a molecular photocatalyst.
abstract: The effects of the planar aromatic organic molecules anthracene and pyrene on the catalytic performance of the intramolecular hydrogen evolving photocatalyst [Ru(tbbpy)2(tpphz)PdCl2](PF6)2 functioning as a photocatalytic dyad have been studied. (1)H-NMR studies on [Ru(tbbpy)2(tpphz)PdCl2](PF6)2 and [Ru(tbbpy)2(tpphz)](PF6)2 show a pronounced interaction of pyrene with the ruthenium complexes due to π-π-interactions. The solid state structure of [Ru(tbbpy)2(tpphz)PdCl2]2[Mo8O24] shows a pronounced π-π-stacking of the polyaromatic ligands. In addition, dimerization constants for the complexes and association constants between the complexes and pyrene were determined. Studies on the photocatalytic hydrogen production show a decreased induction phase and increased turn over frequencies during the initial phase of the catalysis in the presence of anthracene and pyrene utilising the catalyst [Ru(tbbpy)2(tpphz)PdCl2](PF6)2 irrespective of the nature of the polycyclic aromatic hydrocarbon.
authors: University of Ulm, Institute of Inorganic Chemistry Materials and Catalysis, Albert-Einstein-Allee 11, 89081 Ulm, Germany. sven.rau@uni-ulm.de.
authors: Michael G
authors: MG
authors: Pfeffer
authors: Christian
authors: C
authors: Pehlken
authors: Robert
authors: R
authors: Staehle
authors: Dieter
authors: D
authors: Sorsche
authors: Carsten
authors: C
authors: Streb
authors: Sven
authors: S
authors: Rau