Chemical Science [CLAC]

Abstract :

We present the synthesis of novel rotaxanes based on mechanically interlocked porphyrins and fullerene and their advanced investigations by means of photophysical measurements. To this end, a fullerene-capped dumbbell-type axle containing a central triazole was threaded through strapped (metallo)porphyrins—either a free-base or a zinc porphyrin. Femtosecond-resolved transient absorption measurements revealed charge-separation between the porphyrin and fullerene upon light excitation. Solvent polarity and solvent coordination effects induced molecular motion of the rotaxanes upon charge separation and enabled, for the first time, subtle control over the charge recombination by enabling and controlling the directionality of shuttling.

Graphical Abstract :

 

Reference :

Maximilian Wolf, Ayumu Ogawa, Mareike Bechtold, Maxime Vonesch,  Jennifer A. Wytko, Koji Oohora, Stéphane Campidelli, Takashi Hayashi, Dirk M. Guldi and Jean Weiss

Light triggers molecular shuttling in rotaxanes: control over proximity and charge recombination

Chemical Science, 2019 - DOI: 10.1039/C8SC05328F

 

Contact chercheur :

Jean Weiss, Équipe CLAC, Institut de Chimie (UMR 7177).