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An X-Ray Crystallographic Study of N-Methyl-3-nitro-4-(nitromethyl)-4H-chromen-2-amine

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Abstract

4H-chromenes are among the essential groups of biologically important compounds used as synthetic ligands for drug designing and discovery process. In this study, we have presented the single-crystal structure analysis of racemic 4H-chromene derivative namely N-methyl-3-nitro-4-(nitromethyl)-4H-chromen-2-amine. The optical rotation measurement data is supporting that the title compound is racemic in nature. The compound was crystallized in monoclinic crystal system in the non-centrosymmetric space group P21 with unit cell parameters a = 5.1041 (3), b = 7.7519 (4), c = 14.7974 (8), α = 90°, β = 97.088 (5)° and γ = 90°. The nitro group of title compound is disordered over two orientations (N3A/O4A/O5A & N3B/O4B/O5B) with the refined site-occupancy ratio of 0.626(6)/0.374(6). The structure was solved by direct methods using the program SHELXS-97 and refined by SHELXL-97 with the full-matrix least square procedure to a final R-value of 0.0429 and Goodness of Fit (GooF) of 0.982. The molecules in the unit cell are stabilized by N–H···O and C–H···O types of hydrogen bonds. The intermolecular hydrogen bonds are forming C (6) motifs, which is observed to contribute the crystal packing stability. Moreover, the intramolecular hydrogen bonds are forming S (6) motif essential to stabilize the molecular structure of title compound.

Graphical Abstract

Graph-set S (6) and C (6) motifs are involved in stability of the structure and packing respectively.

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Acknowledgments

JM thanks the Council for Scientific and Industrial Research (CSIR) for a Senior Research Fellowship (SRF). RK thank the Centre for Bioinformatics (Funded by Department of Biotechnology and Department of Information Technology, New Delhi, India), Pondicherry University for providing the computational facilities to carry out this research work. AP thanks Pondicherry University for fellowship. HSP thanks the UGC (University Grant Commission) for the Special Assistance Programme (SAP) and the Department of Science and Technology (DST) for the Fund for Improvement of Science and Technology Infrastructure in Universities and Higher Educational Institutions (FIST).

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Correspondence to H. Surya Prakash Rao or R. Krishna.

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Muthukumaran, J., Parthiban, A., Rao, H.S.P. et al. An X-Ray Crystallographic Study of N-Methyl-3-nitro-4-(nitromethyl)-4H-chromen-2-amine. J Chem Crystallogr 41, 1927–1934 (2011). https://doi.org/10.1007/s10870-011-0201-9

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