The second orthorhombic polymorph of zwitterionic metanilic acid at 130 K
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The low-temperature (130 K) crystal structure of the second ortho�om�c polymorph of metanilic acid (3-amino�nzene�lfonic acid), C6H7NO3S, shows the presence of two independent and conformationally similar mol�ules of the zwitterionic acid (3-ammoniobenzenesulfonate) in the asymmetric unit; these inter�t through hydrogen bonding to give a cyclic R22(14) association. Peripheral hydrogen bonding gives a three-dimensional framework polymer, such as was found in the earlier polymorph [Hall & Maslen (1965), Acta Cryst.18, 301-306], but the overall structural make-up is significantly different.
Acta Crystallographica Section E
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