Reversible luminescent humidity chromism of organic-inorganic hybrid PEAMnBr single crystals

• Published in: Dalton transactions : an international journal of inorganic chemistry 2020-05, Vol.49 (17), p.5662-5668
• Main Authors: Gao, Wanru, Leng, Meiying, Hu, Zhixiang, Li, Junze, Li, Dehui, Liu, Huan, Gao, Liang, Niu, Guangda, Tang, Jiang
• Format: Article
• Language: English
• ISSN: 1477-9226; 1477-9234
• DOI: 10.1039/d0dt00514b

Organic-inorganic hybrids have drawn great attention for gas sensors due to their high sensitivity, good selectivity and acceptable stability at room temperature. There are two main approaches by which organic-inorganic hybrids convert gas information to electric or optical signals (vapochromism). Here, we have reported a new organic-inorganic hybrid PEA 2 MnBr 4 for humidity detection by luminescent visible chromism. PEA 2 MnBr 4 single crystals were grown by the solution method and determined by single-crystal X-ray diffraction. Luminescent humidity chromism was found on PEA 2 MnBr 4 from green emission at the water-desorption state to pink emission at the water-adsorption state within 18 s at a relative humidity of 38% RH. This obviously visible chromism was further used to check the water content in toluene with a low detection limit between 0.02 and 0.05 vol%. Reversible luminescent humidity chromism was found on PEA 2 MnBr 4 between green emission and pink emission through water adsorption and desorption.