Off-resonance 13C–2H REDOR NMR for site-resolved studies of molecular motion

Building molecular machine has long been a dream of scientists as it is expected to revolutionize many aspects of technology and medicine. Implementing the solid-state molecular motion is the prerequisite for a practical molecular machine. However, few works on solid-state molecular motion have been reported and it is almost impossible to “see” the motion even if it happens. Here the light-driven molecular motion in solid state is discovered in two non-conjugated molecules s-DPE and s-DPE-TM, resulting in the formation of excited-state though-space complex (ESTSC). Meanwhile, the newly formed ESTSC generates an abnormal visible emission which is termed as clusteroluminescence. Notably, the original packing structure can recover from ESTSC when the light source is removed. These processes have been confirmed by time-resolved spectroscopy and quantum mechanics calculation. This work provides a new strategy to manipulate and “see” solid-state molecular motion and gains new insights into the mechanistic picture of clusteroluminescence.

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Solid state NMR - A tool for studying molecular motion in polymers

Makromolekulare Chemie Macromolecular Symposia ◽

10.1002/masy.19860010106 ◽

1986 ◽

Vol 1 (1) ◽

pp. 39-49 ◽

Cited By ~ 7

Author(s):

Hans Sillescu

Keyword(s):

Solid State ◽

Solid State Nmr ◽

Molecular Motion

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Self-assembly induced luminescence of Eu3+-complexes and application in bioimaging

National Science Review ◽

10.1093/nsr/nwab016 ◽

2021 ◽

Author(s):

Ping-Ru Su ◽

Tao Wang ◽

Pan-Pan Zhou ◽

Xiao-Xi Yang ◽

Xiao-Xia Feng ◽

...

Keyword(s):

Aqueous Solution ◽

Rare Earth ◽

Luminescence Intensity ◽

Self Assembly ◽

Room Temperature ◽

Molecular Motion ◽

Proof Of Concept ◽

Room Temperature Phosphorescence ◽

New Strategy ◽

Size Controlled

Abstract Design and engineering of highly efficient emitting materials with assembly-induced luminescence, such as room temperature phosphorescence (RTP) and aggregation-induced emission (AIE), have stimulated extensive efforts. Here, we propose a new strategy to obtain size-controlled Eu3+-complex nanoparticles (Eu-NPs) with self-assembly induced luminescence (SAIL) characteristics without encapsulation or hybridization. Compared with previous RTP or AIE materials, the SAIL phenomena of increased luminescence intensity and lifetime in aqueous solution for the proposed Eu-NPs are due to the combined effect of self-assembly in confining the molecular motion and shielding the water quenching. As a proof of concept, we also show that this system can be further applied in bioimaging, temperature measurement and HClO sensing. The SAIL activity of the rare-earth (RE) system proposed here offers a further step forward on the roadmap for the development of RE light conversion systems and their integration in bioimaging and therapy applications.

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