Abstract
Three compounds constructed by homopiperazine with 1,5-naphthalenedisulfonic acid, 4,5-dichlorophthalic acid and 2,2′,5,5′-biphenyltetracarboxylic acid have been analyzed with respect to hydrogen bonds appeared in the crystal structures. Single crystal X-ray diffraction studies showed that partial protons were transferred to homopiperazine, which made it possible to form N–H⋯O hydrogen bonds in all three compounds. Moreover, O–H⋯O and C–H⋯O hydrogen bonds are founded in 2 and 3 respectively. All of the three compounds displayed 3D supramolecular network structures for the effect of various hydrogen bonds interactions. In addition solvent water molecules and ethanol molecules played an indispensable role in the construction of compounds 2 and 3. Some main supramolecular synthons observed in three compounds were shown to construct most of these hydrogen bonding networks. These new multi-component molecular solids of homopiperazine were characterized by powder X-ray diffraction, infrared spectroscopy, 1H nuclear magnetic resonance and thermogravimetric analysis.
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