Highly Cooperative Photoswitching in Dihydropyrene Dimers.

ABSTRACT: We present a strategy to achieve highly cooperative photoswitching, where the initial switching event greatly facilitates subsequent switching of the neighboring unit. By linking donor/acceptor substituted dihydropyrenes via suitable π-conjugated bridges, the quantum yield of the second photochemical ring-opening process could be enhanced by more than two orders of magnitude as compared to the first ring-opening. As a result, the intermediate mixed switching state is not detected during photoisomerization although it is formed during the thermal back reaction. Comparing the switching behavior of various dimers, both experimentally and computationally, helped to unravel the crucial role of the bridging moiety connecting both photochromic units. The presented dihydropyrene dimer serves as mo

SUBMITTER: Liesfeld P 

PROVIDER: S-EPMC7589249 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature