Multifunctional materials have always been an attractive research area, but how to combine multiple excellent properties in one compound remains a considerable challenge. Organic–inorganic hybrid compounds are widely used in the design of such materials due to their rich properties and flexible assembly. Herein, two new manganese­(II)-based organic–inorganic hybrid compounds, (C6NH16)2MnBr4 (1) and (C7NH18)2MnBr4 (2), are prepared by the solution method. Compounds 1 and 2 both emit extremely strong green light under UV excitation, with high quantum yields of 45.93 and 50.98%, respectively. In addition, reversible solid-state phase transitions and obvious switchable dielectric properties are shown at 378/366 and 361/352 K, respectively. The coexistence of the dual stimulus–response characteristics of temperature and light in compounds 1 and 2 opens a new path for exploring more multifunctional phase transition materials.

By adjusting the substituent group of the organic ammonium in three molecular ionic complexes, [A][Fe3O(O2CH)8(H2O)]2 (A = NH3(CH2)3NH3 for 1, CH3NH2(CH2)3NH3 for 2 and CH3CH2NH2(CH2)3NH2CH2CH3 for 3) crystallized in 2/m...

In this work, the single crystal to single crystal (SCSC) transformations in three mononuclear copper complexes [CuL 2 2]Cl2·2H2O (1), [CuL 1 2Cl2] (2), and [CuL 2 2]Cl2·4H2O (3) (L 1 = di-2-pyridyl ketone, L 2 = di(pyridin-2-yl)methanediol) are realized by the irreversible dehydration and hydration reaction of L 1 and L 2 . Dark purple crystal 1 is obtained by self-assembly of L 1 and CuCl2·2H2O in solvothermal reactions, in which the carbonyl group of L 1 undergoes a hydration addition reaction to form L 2 . On heating, 1 transforms to 2 by dehydrating water accompanied by the change of the color and coordination octahedron of CuII ions. In a saturated water vapor environment, 2 can absorb six water molecules and transform to 3 with the same color and coordination environment with 1 but different lattice water. The SCSC process from 2 to 3 is reversible: 3 can transform back to 2 on heating like that of 1. Chroma rewritable behaviors in the structural transformation of the complexes make them visually identifiable temperature or water probes.