The Acetylene Bridge in Intramolecular Singlet Fission: A Boon or A Nuisance?

ABSTRACT: Various analogues of the alkylsilylacetylene group are frequently used as auxiliary groups to enhance the solubility and stability of the acene dimer core, widely used as platforms to investigate intramolecular singlet fission (iSF) mechanisms. However, while in the 2,2'-linked dimers they are primarily auxiliary groups, these are essential fragments of the bridging units in 6,6'/5,5'-linked dimers, the two preferred choices for dimerization. The starkly different iSF dynamics observed in the two variants raise the question of what role the acetylene bridges play. Here, we systematically designed a set of (oligo-)para-phenylene bridged 2,2'-linked pentacene dimers with an additional acetylene fragment in the bridging unit to mimic the structure of 6,6'-linked dimers. Contrasting the result

SUBMITTER: Majumder K 

PROVIDER: S-EPMC11656137 | biostudies-literature | 2024 Dec

REPOSITORIES: biostudies-literature