期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 49, 页码 17882-17889出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b08570
关键词
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资金
- Experientia Foundation Fellowship
- EPSRC Impact Acceleration Account
- CESNET [LM2015042]
- CERIT Scientific Cloud [LM2015085]
- EU's Horizon [641725]
- Royal Commission for the Exhibition of 1851
- EPSRC [EP/L02621X/1, EP/N029992/1]
- Royal Society Research Grant [RG150558]
- EPSRC [EP/L02621X/1, EP/N029992/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1641958, EP/N029992/1, EP/L02621X/1, 1452230] Funding Source: researchfish
Small, apolar aromatic groups, such as phenyl rings, are commonly included in the structures of fluorophores to impart hindered intramolecular rotations, leading to.desirable solid-state luminescence properties. However, they are not normally considered to take part in through-space interactions that influence the fluorescent output. Here, we report on the photoluminescence properties of a series of phenyl-ring molecular rotors bearing three, five, six, and seven phenyl groups. The fluorescent emissions from two of the rotors are found to originate, not from the localized excited state as one might expect, but from unanticipated through-space aromatic-dimer states. We demonstrate that these relaxed dimer states can form as a result of intra- or intermolecular interactions across a range of environments in solution and solid samples, including conditions that promote aggregation-induced emission. Computational modeling also suggests that the formation of aromatic-dimer excited states may account for the photophysical properties of a previously reported luminogen. These results imply, therefore, that this is a general phenomenon that should be taken into account when designing and interpreting the fluorescent outputs of luminescent probes and optoelectronic devices based on fluorescent molecular rotors.
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