Isostructural Solvates of Naturally Occurring Allocryptopine Exhibit Both Mechanochromic and Hydrochromic Luminescent Properties

We discovered four new solvates for naturally sourced allocryptopine. The new found crystalline forms are isostructural and have similar crystal structures and packing patterns. However, they exhibit obviously different fluorescence appearance. In addition, the acetone solvate SA, N,N-dimethylformamide solvate SD, and tetrahydrofuran solvate ST also present both luminescent mechanochromic and hydrochromic properties.

A novel carbazole derivative containing fluorobenzene unit: aggregation-induced fluorescence emission, polymorphism, mechanochromism and non-reversible thermo-stimulus fluorescence

Different conformations and packing modes induce the compound with unique stimuli-responsive properties.