室温下固态的近红外发射铬（0）、钼（0）和钨（0）配合物
NIR-Emissive Chromium(0), Molybdenum(0), and Tungsten(0) Complexes in the Solid State at Room Temperature.
作者信息
Boden Pit, Di Martino-Fumo Patrick, Bens Tobias, Steiger Sophie, Albold Uta, Niedner-Schatteburg Gereon, Gerhards Markus, Sarkar Biprajit
机构信息
Department of Chemistry and Research Center Optimas, TU Kaiserslautern, Erwin-Schrödinger-Straße 52, 67663, Kaiserslautern, Germany.
Chair of Inorganic Coordination Chemistry, Institute of Inorganic Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569, Stuttgart, Germany.
出版信息
Chemistry. 2021 Sep 9;27(51):12959-12964. doi: 10.1002/chem.202102208. Epub 2021 Aug 4.
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 at room temperature. These are the first examples of Cr(0), Mo(0) and W(0) complexes that emit in the NIR II region.
基于储量丰富元素的近红外发光体的开发是当代科学的一个重要目标。我们在此展示了具有吡啶基中离子卡宾（MIC）基配体的Cr(0)、Mo(0)和W(0)羰基配合物。详细的光物理研究表明，所有配合物在可见光和近红外区域均表现出双重发射。通过变温下的时间分辨发射和步进扫描傅里叶变换红外光谱，并得到密度泛函理论的支持，发光激发态被归为两个不同的三重态。特别是，近红外发光三重态在室温下表现出高达600±10 ns的前所未有的寿命，量子产率达到1.7⋅10。这些是在近红外二区发光的Cr(0)、Mo(0)和W(0)配合物的首个实例。
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