Hydrous salts of 1-aminoethylidenediphosphonic acid and piperazidine: temperature induced reversible structural transformation in a humid environment†
Abstract
A series of hydrous salts constructed using 1-aminoethylidenediphosphonic acid (AEDPH4) and piperazidine (pip) were synthesized and structurally characterized, namely (AEDPH3)·(pipH2)0.5·0.5H2O (1), (AEDPH3)·(pipH2)0.5·2H2O (2), and (AEDPH3)·(pipH2)0.5·3H2O (3). Compounds 1–3 all contain porous [(AEDPH3)·(pipH2)0.5]n supramolecular hosts with the same components, but illustrate different host structures, which allow different numbers of water molecules to lie inside. Moreover, a reversible structural transformation circle is observed among the single crystals of the three hydrous salts, that is, compounds 1–3 through changing the temperature, can transform into each other in a humid environment.
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