Integrated Optical Sciences
Biomolecules and nanostructures
The Optical Sciences group studies the interaction of light and matter at the nanoscale.
We do this by exploring ways to shape light and its environment. It's what we call
active and passive control. Our current focus is on the interaction of light with
biomolecules and nanostructures. We are part of Twente
University's Department of Science and Technology and member of the
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