Lo, K.M.; Ng, S.W. (2008) Bis(carboxy-meth-yl)ammonium 4-toluene-sulfonate. Acta crystallographica. Section E, Structure reports online, 64 (Pt 9). o1798. ISSN 1600-5368
The imino-diacetic acid component of the title salt, C(4)H(8)NO(4) (+)·C(7)H(7)SO(3) (-), is protonated at the N atom. The cation uses the ammonium group to form hydrogen bonds to the O atoms of two adjacent sulfonate groups. In addition, the carboxylic acid portions of the cation form hydrogen bonds to the sulfonate groups. The hydrogen-bonding inter-actions give rise to a layer structure.
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