The second orthorhombic polymorph of zwitterionic metanilic acid at 130 K
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Wermuth, UD
Young, DJ
White, JM
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Abstract
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.
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Acta Crystallographica Section E
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62
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© The Author(s) 2006. For information about this journal please refer to the journal’s website. All articles published in Acta Crystallographica Section E are open access and distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. See http://creativecommons.org/licenses/by/2.0/uk/legalcode
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Chemical Sciences