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In the title compound, C4H8N3O+·NO3-, creatininium cations and nitrate anions are linked to each other through strong hydrogen bonds, formed by all H atoms covalently bonded to the N atoms. Short contacts are also observed between the anions. This complex three-dimensional network of hydrogen bonds ensures the cohesion of the ionic structure.

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In the structure of the mononuclear title complex, [Cu(C21H16NO2S)2], the CuII atom, which lies on an inversion centre, displays approximately square-planar coordination geometry. The bidentate ligands coordinate through their phenolate O and imine N atoms in a mutually trans orientation. The structure is stabilized by a three-dimensional network of C—H...O hydrogen bonds.

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The crystal structure of DL-2-ammonium-4-meth­ylvaleric acid nitrate (C6H14NO2+·NO3-, DL-leucinium nitrate) can be described by considering two types of layers parallel to the bc plane: hydro­philic layers including the head of the leucinium residue (ammonium and carboxylic groups) with the nitrate anion, and hydro­phobic layers including the tail of the leucinium residue.

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In the title compound, C4H6N3O+·C2HO4·H2O, the cytosine mol­ecule is protonated and oxalic acid is in the monoionized state. The structure is stabilized by O—H...O and N—H...O hydrogen bonds, and van der Waals inter­actions. The water mol­ecules are also found to mediate inter­actions between oxalate anions and cytosinium cations.
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