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Guanidinium 4-nitro­anthranilate monohydrate, CH6N3+·C7H5N2O4−·H2O, determined at 130 K, forms a primary hydrogen-bonded ribbon structure through cyclic hydrogen-bonding inter­actions involving all six protons of the guanidinium cation with the amino N-atom and carboxyl­ate O-atom acceptors of the anion, and the water mol­ecule of solvation. Other inter­actions, including the water mol­ecule bridging the primary ribbons, give a three-dimensional structure. [ABSTRACT FROM AUTHOR]

The crystal structure of a non-centrosymmetric polymorphic modification of the title compound, C9H7NO4, determined at 130 K, shows the presence of 21 screw-generated one-dimensional zigzag chains formed through catemeric C(4) syn– anti carboxylic acid hydrogen-bonding associations. [ABSTRACT FROM AUTHOR]

The structures of two pseudopolymorphic hydrates of brucine, C23H26N2O4·4H2O, (I), and C23H26N2O4·5.25H2O, (II), have been determined at 130 K. In both (I) and (II) (which has two independent brucine mol­ecules together with 10.5 water mol­ecules of solvation in the asymmetric unit), the brucine mol­ecules form head-to-tail sheet substructures, which associate with the water mol­ecules in the inter­stitial cavities through hydrogen-bonding associations and, together with water–water associations, give three-dimensional framework structures. [ABSTRACT FROM AUTHOR]

The structure of the title, compound C23H27N2O4+·C8H5O4−·3H2O, has been determined at 130 K. The hydrogen isophthalate anions and the water mol­ecules (one of which is disordered over two approximately equal sites) associate through extensive hydrogen-bonded inter­actions, including those with the common undulating brucinium cation layer substructures, forming a three-dimensional framework structure. [ABSTRACT FROM AUTHOR]

The low-temperature (130 K) crystal structure of the second ortho­rhom­bic polymorph of metanilic acid (3-amino­benzene­sulfonic acid), C6H7NO3S, shows the presence of two independent and conformationally similar mol­ecules of the zwitterionic acid (3-ammoniobenzenesulfonate) in the asymmetric unit; these inter­act 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. [ABSTRACT FROM AUTHOR]