Abstract
The molecular and high-energy density properties of isolated (3,4-dinitropyrazole, 34DNP) and fused pyrazole ring (1H,4H-3,6-dinitropyrazolo[4,3-c]pyrazole, DNPP) systems were studied by density functional theory (DFT) at the B3LYP/G D3BJ level of theory with def2-TZVP basis set. The theoretically optimized geometrical parameters of both molecules are similar to the corresponding experimental geometrical values. With this, atoms in molecules (AIM), electrostatic, intrinsic bond strength index (IBSI), and natural bond orbital (NBO) properties of the 34DNP and DNPP molecules were studied. These studies show that one of the nitro groups in 34DNP is less stable than other nitro groups present in 34DNP and DNPP molecules. The optimized geometry, AIM analysis, and NBO results confirmed that one of the C-NO2 groups in isolated dinitropyrazole 34DNP makes fewer orbital interactions with the pyrazole ring, and deviation in planarity leads to relatively less stability and acetic than the fused dinitropyrazole DNPP molecule. These studies reveal that the effect of ring fusion in dinitropyrazole derivatives may be used to design high-quality high-energy density materials.
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Acknowledgements
Thangavel Subramani acknowledges the Bioinformatics Resources and Applications Facility (BRAF), C-DAC, Pune, for providing the computational facility for this work.
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Thangavel Subramani and Srinivasan Ponnusamy conceived the idea and designed the theoretical calculation. Thangavel Subramani and Jothibaskar Natarajan, Sathya Lakshmanan carried out computer simulation and data analyses. Thangavel Subramani, Logesh Ganesan and Manivasakan Palanisamy carried out NBO and IBSI analysis and prepared the manuscript. All authors checked the draft.
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Highlights
• The molecular geometry, AIM analysis, electrostatic and IBSI, PDA, and NBO properties of the 34DNP and DNPP molecules were analyzed.
• The tilted -NO2 in the isolated pyrazole ring is favorable for increasing the O–O bond character in -NO2 and leads to less favorable bonding with the pyrazole ring.
• The dinitropyrazole ring fusion provides coplanarity to -NO2 with the pyrazole ring and less steric interaction with the molecule.
• The isolated pyrazole ring provides higher acidity to the attached hydrogen than the fused pyrazole ring.
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Subramani, T., Natarajan, J., Lakshmanan, S. et al. In silico investigations of high-energy density properties and effect of ring fusion on dinitropyrazole derivatives. Struct Chem 35, 871–884 (2024). https://doi.org/10.1007/s11224-023-02240-x
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DOI: https://doi.org/10.1007/s11224-023-02240-x