N,N,N′,N′-Tetra­methyl­butane-1,4-diammonium bis­(p-amino­benzoate) 2.25-hydrate

✍ Scribed by Elangovan, A. ;Thamaraichelvan, A. ;Ramu, A. ;Athimoolam, S. ;Natarajan, S.

• Publisher: International Union of Crystallography
• Year: 2007
• Tongue: English
• Weight: 499 KB
• Volume: 63
• Category: Article
• ISSN: 1600-5368
• DOI: 10.1107/s1600536807007325

✦ Synopsis

The asymmetric unit of the title compound, C~8~H~22~N~2~
^2+^·2C~7~H~6~NO~2~
^−^·2.25H~2~O, consists of half each of two centrosymmetric tetramethylbutane-1,4-diammonium cations, two p-aminobenzoate anions and 2.25 solvent water molecules. As a characteristic feature of 4-aminocarboxylic acid, twisting of the carboxylate group from the aromatic plane is observed in the p-aminobenzoate anions. Other noteworthy features are the `head-to-tail' chain and the formation of dimers through N—H...O and O—H...O hydrogen bonds involving amino groups, carboxylate groups and water molecules. Futhermore, an intricate three-dimensional hydrogen-bonding network involving N—H...O and O—H...O is observed.