A Vanadium(III) Complex with Blue and NIR-II Spin-Flip Luminescence in Solution

• DOI: 10.1021/jacs.0c02122
• Publication Date: 2020-04-10T15:30:08Z
• Authors: Matthias Dorn; Jens Kalmbach; Pit Boden; Ayla Päpcke; Sandra Gómez; Christoph Förster; Felix Kuczelinis; Luca M. Carrella; Laura A. Büldt; Nicolas H. Bings; Eva Rentschler; Stefan Lochbrunner; Leticia González; Markus Gerhards; Michael Seitz; Katja Heinze
• Keywords: Quantum yield

Luminescence from Earth-abundant metal ions in solution at room temperature is a very challenging objective due to the intrinsically weak ligand field splitting of first-row transition ions, which leads efficient nonradiative deactivation via metal-centered states. Only handful 3dn complexes (n ≠ 10) show sizable luminescence temperature. near-infrared spectral region even more difficult achieve as further pathways come into play. No have displayed emission >1000 nm up now. Here, we report vanadium(III) complex mer-[V(ddpd)2][PF6]3 yielding phosphorescence around 1100 valeronitrile glass 77 K well acetonitrile with 1.8 × 10–4% quantum yield (ddpd = N,N′-dimethyl-N,N′-dipyridine-2-ylpyridine-2,6-diamine). In addition, shows strong blue fluorescence 2% Our comprehensive study demonstrates that d2 electron configuration constitute new class and NIR-II luminophores, complement classical established expensive precious metals rare-earth elements.