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Crystal structures, computational studies, and Hirshfeld surface analysis on 7-hydroxy-4-methyl-2H-chromen-2-one and 7-hydroxy-4-methyl-8-nitro-2H-chromen-2-one Odame, Felix Boadi, Nathaniel Owusu Nanga, Salifu Aniagyei, Albert Hosten, Eric Crystal Coumarin Monoclinic Computation Orthorhombic Hirshfeld surface analysis 7-Hydroxy-4-methyl-2H-chromen-2-one and 7-hydroxy-4-methyl-8-nitro-2H-chromen-2-one have been synthesized. The compounds have been characterized using IR, NMR, GC-MS, and elemental analysis. The single-crystal X-ray structure of the compounds showed that compound 1 was crystallized in the orthorhombic space group P212121 while compound 2 crystalized in the monoclinic space group P21/c. A comparison of the computed and experimental bond lengths and bond angles showed good agreement among the data. A Hirshfeld surface analysis showed that the H∙∙∙O/O∙∙∙H interaction was the most prominent molecular interaction for both compound 1 H∙∙∙O/O∙∙∙H (34.4%) and compound 2 H∙∙∙O/O∙∙∙H (48.6%). Atlanta Publishing House LLC 2025-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf text/plain text/plain application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/2674 10.5155/eurjchem.16.3.275-286.2674 European Journal of Chemistry; Vol. 16 No. 3 (2025): September 2025; 275-286 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/2674/2961 https://www.eurjchem.com/index.php/eurjchem/article/view/2674/2941 https://www.eurjchem.com/index.php/eurjchem/article/view/2674/2942 https://www.eurjchem.com/index.php/eurjchem/article/view/2674/2962 Copyright (c) 2025 Felix Odame, Nathaniel Owusu Boadi, Salifu Nanga, Albert Aniagyei, Eric Hosten https://creativecommons.org/licenses/by-nc/4.0