Unexpected organic hydrate luminogens in the solid state

Feng Zhou, Peiyang Gu, Zhipu Luo, Hari Krishna Bisoyi, Yujin Ji, Youyong Li, Qingfeng Xu, Quan Li () and Jianmei Lu ()
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Feng Zhou: Soochow University
Peiyang Gu: Soochow University
Zhipu Luo: Soochow University
Hari Krishna Bisoyi: Kent State University
Yujin Ji: Soochow University
Youyong Li: Soochow University
Qingfeng Xu: Soochow University
Quan Li: Kent State University
Jianmei Lu: Soochow University

Nature Communications, 2021, vol. 12, issue 1, 1-8

Abstract: Abstract Developing organic photoluminescent materials with high emission efficiencies in the solid state under a water atmosphere is important for practical applications. Herein, we report the formation of both intra- and intermolecular hydrogen bonds in three tautomerizable Schiff-base molecules which comprise active hydrogen atoms that act as proton donors and acceptors, simultaneously hindering emission properties. The intercalation of water molecules into their crystal lattices leads to structural rearrangement and organic hydrate luminogen formation in the crystalline phase, triggering significantly enhanced fluorescence emission. By suppressing hydrogen atom shuttling between two nitrogen atoms in the benzimidazole ring, water molecules act as hydrogen bond donors to alter the electronic transition of the molecular keto form from nπ* to lower-energy ππ* in the excited state, leading to enhancing emission from the keto form. Furthermore, the keto-state emission can be enhanced using deuterium oxide (D2O) owing to isotope effects, providing a new opportunity for detecting and quantifying D2O.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-22685-0

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DOI: 10.1038/s41467-021-22685-0

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