Tunable Photoluminescence Including White-Light Emission Based on Noncovalent Interaction-Locked N ,N ′-Disubstituted Dihydrodibenzo[a ,c ]phenazines

Jie Wang, Xuyang Yao, Yang Liu, Haitao Zhou, Wei Chen, Guangchen Sun, Jianhua Su, Xiang Ma, He Tian
  • Advanced Optical Materials, April 2018, Wiley
  • DOI: 10.1002/adom.201800074

Tunable photoluminescence including white-light emission based on supramolecular strategy

What is it about?

Utilizing supramolecular assembling system to achieve tunable photoluminescent emission has become an important method for the development of chemosensors and light-emitting materials. N, N′-disubstituted-dihydrodibenzo[a,c]phenazines derivatives, with dual photoluminescence emission and large stokes shift, have shown their talent in generating tunable luminescent materials. These unique behaviors could be rationalized by excited-state configuration transformations induced by vibration, named as vibration-induced emission (VIE). Herein, the first example of a supramolecular assembling system with water-soluble phenazine derivative DPAC-AB and bis-p-sulfonatocalix[4]arene (BSC4) is designed. Based on hydrophobic interaction and host-guest interaction, tunable fluorescent emission color from orange-red to white (CIE coordinate 0.32, 0.37)) to blue could be obtained. Additionally, a common competitive guest is utilized to recover the fluorescent emission. It is convincible that this method to efficiently control the emission of VIE molecules through supramolecular assembling would provide deeper understanding of VIE mechanism and open new avenues in developing tunable light-emitting materials.

Why is it important?

This supramolecular strategy broke the limitations of tedious molecule synthesis (J. Am. Chem. Soc. 2017, 139, 1636) and was promising to achieve sensors of acetylcholine in biological applications. Additionally, the vibration of the VIE molecule was found to be suppressed by the inclusion interaction from supramolecular host BSC4 even at molecule level, which was also worth mentioning as it was quite different from our previous VIE systems. It is noteworthy that owing to the intriguing phenomenons brought by supramolecular chemistry, this reversible non-covalent interactions based strategy would offer exciting opportunities for the development of novel stimuli-responsiveness materials. And the aqueous molecules as well as the aqueous media are supposed to have great biological potential such as biosensors and bioimaging.

Perspectives

Jie Wang (Author)
East China University of Science and Technology

Supramolecular assembling system is an excellent strategy to achieve efficient control or multi-functions for single molecules and aggregates. We were quite surprised by the intriguing phenomenon during the research on this project. And we hope you find this article thought-provoking.

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http://dx.doi.org/10.1002/adom.201800074

The following have contributed to this page: Jie Wang