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Cations and anions of the title compound {systematic name: 1-[4-(amino­carbonyl)butyl]guanidinium bis­(hydrogen­squarate)}, C6H17N5O2+·2C4HO4−, are connected into a three-dimensional network by inter­molecular N—H⋯O hydrogen bonds between thel-argininamidium ammonium, amide and guanidinium functions and the hydrogensquarate carbonyl O atoms. The independent hydrogensquarate monoanions are linked into dimers by pairs of O—H⋯O′ hydrogen bonds. [ABSTRACT FROM AUTHOR]

The title compound, 2C9H8NO2+·C4O42−, contains a dianion with approximately D4 h symmetry [C—C = 1.465 (4)–1.470 (4) Å and C—O = 1.248 (4)–1.264 (4) Å]. Individual dianions are linked to four neighbouring 8-hydroxy­quinolinium cations by O⋯H—N [2.666 (4) and 2.681 (4) Å] and O⋯H—O [2.596 (3) and 2.605 (3) Å] hydrogen bonds to generate a polymeric chain. [ABSTRACT FROM AUTHOR]

The title compound, 4-phenyl­pyridinium-3-squarate, C15H9NO3, exhibits an inter­planar angle between the pyridinium and squarate rings of 0.6 (1)°. It displays a dipolar electronic ground-state structure, with a positively charged pyridinium fragment and a negatively charged squarate moiety. In the mol­ecule, the two aromatic rings are twisted by 31.6 (1)°. The bond lengths within the squarate system represent average values for the two possible resonance structures, with a central typical carbon­yl bond [1.203 (2) Å] flanked by two longer `semicarbon­yl' bonds of lengths 1.228 (2) and 1.221 (2) Å. [ABSTRACT FROM AUTHOR]

Anions and cations of the title compound, C5H8N3+·C4HO4−, are connected by moderately strong intermolecular N—H...O hydrogen bonds into an infinite three-dimensional network. Hydrogen squarate anions form dimers through strong O—H...O interactions. [ABSTRACT FROM AUTHOR]

Mol­ecules of the title compound, 2-(2-eth­oxy-3,4-dioxocyclo­butenylamino)-2-[2-(methyl­sulfan­yl)eth­yl]acetamide, C11H16N2O4S, are connected into chains in the [010] direction by inter­molecular N—H⋯O hydrogen bonds involving thel-methio­ninamide N atoms and its carbonyl O atom. [ABSTRACT FROM AUTHOR]

Mol­ecules of the title compound, C9H11NO, are connected into infinite chains by inter­molecular N—H⋯O hydrogen bonds of length 2.893 (3) Å between the N-methyl­amino and carbonyl functions. [ABSTRACT FROM AUTHOR]

Cations of the title compound, C5H11N2O+·C4HO4−, are connected by inter­molecular N(amide)— H⋯O(amide) hydrogen bonds into helical chains, whereas anions are inter­linked by strong O(hydrox­yl)—H⋯O hydrogen bonds into chains. These two distinct chains are interconnected by both N(amide)—H⋯O and N(ammonium)—H⋯O hydrogen bonds into a three-dimensional framework. One of the ammonium protons is involved in a three-centre hydrogen bond. [ABSTRACT FROM AUTHOR]

Cations of the title compound, C3H9N2O+·C4HO4−·H2O, are connected by inter­molecular Nammonium—H⋯Oamide hydrogen bonds into helical chains propagating in the [010] direction. These chains are further linked by Nammonium—H⋯O hydrogen bonds to the hydrogensquarate anions, which in turn form O—H⋯O-bridged chains in the [100] direction, thereby giving rise to a three-dimensional network. The water O atoms participate in two O—H⋯O hydrogen bonds to the anions and one O⋯H—Namide bridge to the cation. [ABSTRACT FROM AUTHOR]

Cations of the title compound, 1-carbamoyl-2-(4-hydroxy­phen­yl)ethyl­ammonium chloride monohydrate, C9H13N2O2+·Cl−·H2O, are connected by inter­molecular N—H⋯O [N⋯O = 2.905 (3) Å] hydrogen bonds between the amide and 4-hydr­oxy functions into helical chains propagating along the [010] axis. The Cl− ions and water O atom participate in a complex pattern of hydrogen bonds to link these ribbons into a three-dimensional network. [ABSTRACT FROM AUTHOR]

Cations and anions of the title compound {systematic name: 1-[4-(aminocarbonyl)butyl]guanidinium bis(hydrogensquarate)}, C6H17N5O2+.2C4HO4(-), are connected into a three-dimensional network by intermolecular N-H...O hydrogen bonds between the L-argininamidium ammonium, amide and guanidinium functions and the hydrogensquarate carbonyl O atoms. The independent hydrogensquarate monoanions are linked into dimers by pairs of O-H...O' hydrogen bonds.