| Autor: |
McNamara LE; Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States., Boyn JN; Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States., Melnychuk C; Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States., Anferov SW; Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States., Mazziotti DA; Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States., Schaller RD; Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, United States.; Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States., Anderson JS; Department of Chemistry, The University of Chicago, Chicago, Illinois 60637, United States. |
| Abstrakt: |
Near-infrared (NIR)-emitting molecules are promising candidates for biological sensing and imaging applications; however, many NIR dyes are large conjugated systems which frequently have issues with stability, solubility, and tunability. Here, we report a novel class of compact and tunable fluorescent diradicaloid complexes which are air-, water-, light-, and temperature-stable. These properties arise from a compressed π manifold which promotes an intense ligand-centered π-π transition in the NIR II (1000-1700 nm) region and which subsequently emits at ∼1200 nm. This emission is among the brightest known for monomolecular lumiphores with deep NIR II (>1100 nm) emission, nearly an order of magnitude brighter than the commercially available NIR II dye IR 26. Furthermore, this fluorescence is electrochemically sensitive, with efficient switching upon addition of redox agents. The brightness, stability, and modularity of this system distinguish it as a promising candidate for the development of new technologies built around NIR emission. |
