Tunable Aggregation‐Induced Emission of Imidazole Hydrazones by pH and Anions

Autor:	Jinhu Zhao, Xiaochuan Li, Xiaojing Liu, Dongjie Tian, Jianji Wang, Xin Zheng
Rok vydání:	2019
Předmět:	chemistry.chemical_classification 010405 organic chemistry Chemistry Hydrogen bond Organic Chemistry Hydrazone Halide Protonation General Chemistry 010402 general chemistry Photochemistry 01 natural sciences Catalysis 0104 chemical sciences Ion chemistry.chemical_compound Deprotonation Imidazole Molecule
Zdroj:	Chemistry – A European Journal. 25:16519-16522
ISSN:	1521-3765 0947-6539
DOI:	10.1002/chem.201904259
Popis:	Aggregation-induced emission (AIE) materials have drawn great attention for applications as organic light-emitting diodes (OLED) and probes. The applications are, however, restricted by the complex syntheses and hydrophobic properties. Herein, a one-step synthesis of an AIE material based on imidazole hydrazone is assessed. Protonation of the imidazole-H leads to emission color change from yellow to green in the solid state. The emission color is recovered upon imidazole-H+ deprotonation. Moreover, the emission wavelength shifts from 532 to 572 nm by anion exchange. In addition, an enhanced emission (ΦF up to 22.6 %) was obtained with the Br- anion compared with NTf2- , SbCl5- , PF6- , and OTf- anions. X-ray crystallography studies together with theoretical calculations show that the enhanced emission of hydrazone salts arises from strong hydrogen bonding between the hydrazone proton and the halide ion (Cl- or Br- ).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74cd3f397077ad832e81265a8b0ea297 https://doi.org/10.1002/chem.201904259 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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