NIR-Emissive Chromium(0), Molybdenum(0), and Tungsten(0) Complexes in the Solid State at Room Temperature |
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| Authors: | Pit Boden Patrick Di Martino-Fumo Tobias Bens Sophie Steiger Uta Albold Prof Dr Gereon Niedner-Schatteburg Prof Dr Markus Gerhards Prof Dr Biprajit Sarkar |
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| Institution: | 1. Department of Chemistry and Research Center Optimas, TU Kaiserslautern, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern, Germany;2. Chair of Inorganic Coordination Chemistry, Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany;3. Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstraße 34–36, 14195 Berlin, Germany;4. Department of Chemistry and Research Center Optimas, TU Kaiserslautern, Erwin-Schrödinger-Straße 52, 67663 Kaiserslautern, Germany
Deceased. |
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| Abstract: | The development of NIR emitters based on earth-abundant elements is an important goal in contemporary science. We present here Cr(0), Mo(0), and W(0) carbonyl complexes with a pyridyl-mesoionic carbene (MIC) based ligand. A detailed photophysical investigation shows that all the complexes exhibit dual emissions in the VIS and in the NIR region. The emissive excited states are assigned to two distinct triplet states by time-resolved emission and step-scan FTIR spectroscopy at variable temperature, supported by density functional theory. In particular, the NIR emissive triplet state exhibits unprecedented lifetimes of up to 600±10 ns and quantum yields reaching 1.7 ⋅ 10−4 at room temperature. These are the first examples of Cr(0), Mo(0) and W(0) complexes that emit in the NIR II region. |
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| Keywords: | carbonyl ligands mesoionic carbenes NIR II emitters step-scan FTIR spectroscopy X-ray diffraction |
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