Biomolecules and nanostructures
The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
New photophysics of hydrogen generating Ru-Pt photocatalysts
Knowledge of the ultrafast photodynamics that are induced by photoexcitation are of prime importance for the realization of supramolecular assembly designs for solar hydrogen generation. As a continuation of our project on Ru-Pd photocatalysts, we are now focusing on the photophysics of two new Ru-Pt photocatalysts, which are shown in Figure 1.
Figure 1. Molecular structure of [Ru(bpy)2tpyPt(CH3CN)I]2+ (left, RuPt) and [Ru(dceb)2tpyPt(CH3CN)I]2+ (right, EtRuPt).
Both RuPt and EtRuPt are active for hydrogen generation, with the latter behaving much more efficient than the former. On basis of ultrafast transient absorption (TA, data of RuPt in Figure 2) and density functional theory calculations, we explain this effect in terms of directionality of inter-ligand internal conversion and long-lived excited states.
Figure 2. TA spectra of RuPt, the fits are represented as solid curves.
Collaborations: Prof. Han Vos, Dublin City University