title: Mechanochromism triggered fluorescent color switching among polymorphs of a natural fluorescence pigment.
abstract: A naturally occurring pigment emodin is reported here as an example to extend mechanochromic luminescent material systems. Three polymorphs, two hydrates and the amorphous state of emodin, are successfully synthesized. These solid forms exhibit significantly different fluorescence properties, which indicates its potential application in mechano-sensors and security papers.
authors.affiliation: Pharmaceutical Analytical & Solid-State Chemistry Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. xuefengmei@simm.ac.cn and University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing, 100049, China.
authors.forename: Meiqi
authors.initials: M
authors.lastname: Li
authors.affiliation: Pharmaceutical Analytical & Solid-State Chemistry Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. xuefengmei@simm.ac.cn.
authors.forename: Qi
authors.identifier: http://orcid.org/0000-0002-2652-4684
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Pharmaceutical Analytical & Solid-State Chemistry Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. xuefengmei@simm.ac.cn.
authors.forename: Jian-Rong
authors.initials: JR
authors.lastname: Wang
authors.affiliation: Pharmaceutical Analytical & Solid-State Chemistry Research Center, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. xuefengmei@simm.ac.cn.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Mei