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NIR‐Emissive Chromium(0), Molybdenum(0), and Tungsten(0) Complexes in the Solid State at Room Temperature
Author(s) -
Boden Pit,
Di MartinoFumo Patrick,
Bens Tobias,
Steiger Sophie,
Albold Uta,
NiednerSchatteburg Gereon,
Gerhards Markus,
Sarkar Biprajit
Publication year - 2021
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.202102208
Subject(s) - molybdenum , excited state , tungsten , mesoionic , phosphorescence , chromium , carbene , density functional theory , photochemistry , spectroscopy , ligand (biochemistry) , triplet state , materials science , chemistry , time dependent density functional theory , fluorescence , inorganic chemistry , atomic physics , computational chemistry , physics , catalysis , optics , organic chemistry , receptor , quantum mechanics , biochemistry
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.