Ns in the roemission Moreover, the emission with the solvent polarity and present in rotaxane model taxanes). quenching was independentquenching was independent with the solvent polarity compounds lacking the model compounds lacking the fullerene moiety, which informed and present in rotaxane fullerene moiety, which informed the authors that the quenching did not involve direct interaction of 1 not involve direct interaction authors and C60. the the authors that the quenching did ZnP and C60 . Accordingly, the of 1ZnPattributed Ac1 quenching to authors attributed to quenching to 2 ] subunit to ZnP to corresponding cordingly, theEnT from the ZnPthe the [Cu(phen)EnT from the 1yield thethe[Cu(phen)2] MLCT to yield the (step 2). By monitoring the transition YTX-465 manufacturer absorption signal in the transubunit excited statecorresponding MLCT excited state (step 2). By monitoringthe C60 at about max = signal of the rotaxanes, which obeyed a nm within the rotaxanes, along sition absorption 1000 nm in theC60 at about max = 1000 biexponential price law,which with a careful transient absorptionalong with a careful transient absorption investigation obeyed a biexponential price law, investigation of quite a few model compounds, the authorsof various model compounds, the authors determined that the MLCT manifold was oxidatively quenched by the C60 by way of ET to yield the intermediate ZnP Cu(phen)2]2 60 CSS, which partially yielded the ground state via BET (steps three and 5, respectively). Nevertheless, detection in the robust signature transient absorption of the ZnP centered at max = 680 nm, whose lifetime matched the lengthy component decay observed for thePhotochem 2021,determined that the MLCT manifold was oxidatively quenched by the C60 by means of ET to yield the intermediate ZnP Cu(phen)2 ]2 60 CSS, which partially yielded the ground state by means of BET (methods 3 and five, respectively). Nevertheless, detection of the strong signature transient absorption on the ZnP centered at max = 680 nm, whose lifetime matched the long component decay observed for the biexponential rate law on the fingerprint absorption in the C60 at max = 1040 nm, offered clear cut proof for an ET reaction in the ZnP stoppers towards the oxidized [Cu(phen)two ]2 complex to afford the final ZnP Cu(phen)2 ] C60 CSS (step four). The lifetimes on the final CSSs inside the rotaxanes were in the array of 0.four.4 (step six). Such somewhat long lifetimes with the final CSSs allowed the authors Photochem 2021, 1, FOR PEER REVIEWto CFT8634 site conclude that BET within the rotaxanes occurred within the Marcus inverted area. The key 9 photophysical decay of Schuster’s and Guldi’s rotaxanes are summarized in the energy level diagram depicted in Figure 6.Figure Power level diagram and proposed photophysical decay pathways for for Schuster-Guldi Figure 6.6. Power level diagram and proposed photophysical decay pathways Schuster-Guldi rotaxanes upon exclusive excitation on the ZnP groups at 420 nm. rotaxanes upon exclusive excitation on the ZnP groups at 420 nm.According to these promising findings, Schuster, Guldi and collaborators reported Based on those promising findings, Schuster, Guldi and collaborators reported a a second set of rotaxanes [84], in which the positions the the ZnP and groups werewere second set of rotaxanes [84], in which the positions of of ZnP and C60 C60 groups rereversed. Accordingly, within this new of rotaxanes, the ZnP moiety was covalently attached versed. Accordingly, in this new setset of rotaxanes, the ZnP moiety was covalently attached towards the.