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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Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.002 Å R factor = 0.041 wR factor = 0.093 Data-to-parameter ratio = 23.6For details of how these key indicators were automatically derived from the article, see