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