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Substituent Effects in 3,3’ Bipyrazole Derivatives. X-ray Crystal Structures, Molecular Properties and DFT Analysis

Ibrahim Bouabdallah, Tarik Harit, Mahmoud Rahal, Fouad Malek, Monique Tillard, Driss Eddike

Abstract


The single crystal X-ray structure of new 1,1’-bis(2-nitrophenyl)-5,5’-diisopropyl-3,3’-bipyrazole, 1, is triclinic P , a = 7.7113(8), b = 12.3926(14), c = 12.9886(12) Å, a = 92.008(8), β = 102.251(8), γ = 99.655(9)°. The structural arrangement is compared to that of 5,5’-diisopropyl-3,3’-bipyrazole, 5, whose single crystal structure is found tetragonal I41/a, a = b = 11.684(1), c = 19.158(1) Å. The comparison is also extended to the structures previously determined for 1,1’-bis(2-nitrophenyl)-5,5’-propyl-3,3’-bipyrazole, 2, 1,1’-bis(4-nitrophenyl)-5,5’-diisopropyl-3,3'-bipyrazole, 3, and 1,1’-bis(benzyl)-5,5’-diisopropyl-3,3'-bipyrazole, 4. Density Functional Theory (DFT) calculations are used to investigate the molecular geometries and to determine the global reactivity parameters. The geometry of isolated molecules and the molecular arrangements in the solid state are analyzed according to the nature of the groups connected to the bipyrazole core.


Keywords


Crystal structure; bipyrazole; DFT; substituent; reactivity indices.

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DOI: http://dx.doi.org/10.17344/acsi.2021.6756

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