Stability and Ultrafast Dynamics of Luminescent Biquinoxen-<i>Bis</i>-σ^H-Adducts.

ABSTRACT: We report the synthesis of two new biquinoxen-σ^H-adducts (3,3'-diisopropoxy-4,4'-dimethyl-3,3',4,4'-tetrahydro-2,2'-biquinoxaline (Mbqn-(OⁱPr)₂) (1) and 3,3'-bis(isopropylthio)-4,4'-dimethyl-3,3',4,4'-tetrahydro-2,2'-biquinoxaline (Mbqn-(SⁱPr)₂) (2)) with the same molecular structure other than the exchange of two oxygen atoms with sulphur atoms. This enables us to directly compare the optical properties and stability of the compounds as a result of this substitution. For freshly prepared solutions of 1, a fluorescence quantum yield of 97% is observed, whereas for 2, the value is much lower at 7%. We furthermore note a decrease in quantum yields for solutions investigated after certain storage times, indicat

SUBMITTER: Braun J 

PROVIDER: S-EPMC12566332 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature