The reaction of trans-1,4-diaminocyclohexane and piperazine with hydrochloric acid in dimethylsulfoxide or water led to new co-crystals and chloride salts, namely trans-1,4-diammoniocyclohexane dichloride dimethylsulfoxide 1, trans(ammonio-4-amino)cyclohexane monochloride 2, and piperazinium dichloride hemihydrate 3. The crystal structures show unexpected similarities to already noted organic and metal–organic derivatives. Furthermore, hot-stage microscopy, variable-temperature X-ray diffraction studies, and thermoanalytical measurements revealed decomposition reactions, solvent-free reaction pathways, and phase transition at temperatures between 160 and 210 °C.
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