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Artificial photosynthesis: the second electron finally accessible


​A Research Team from I2BC@Saclay (SB2SM), in collaboration with ISMO and ICMMO teams (CNRS / Univ.Paris-Sud, Univ.Paris-Saclay) measured  accumulation kinetics of electrical charges within a molecular system designed for studies on artificial photosynthesis. These works, published in Angewandte Chemie, show for the first time the second electron of this fundamental process about the conversion of light energy into fuel.

Published on 21 February 2018

​Abstract

Biomimetic models that contain elements of photosynthesis are fundamental in the development of synthetic systems that can use sunlight to produce fuel. The critical task consists of running several rounds of light-induced charge separation, which is required to accumulate enough redox equivalents at the catalytic sites for the target chemistry to occur. Long-lived first charge-separated state and distinct electronic signatures for the sequential charge accumulated species are essential features to be able to track these events on a spectroscopic ground. Herein, we use a double-excitation nanosecond pump–pump–probe experiment to interrogate two successive rounds of photo-induced electron transfer on a molecular dyad containing a naphthalene diimide (NDI) linked to a [Ru(bpy)3]2+(bpy=bipyridine) chromophore by using a reversible electron donor. We report an unprecedented long-lived two-electron charge accumulation (t=200 μs).

Read the French version.

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