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

Area of Science:

• Crystal Chemistry
• Computational Chemistry
• Organic Chemistry

Background:

• Bipyrazole derivatives are important heterocyclic compounds with diverse applications.
• Understanding the structure-property relationships of substituted bipyrazoles is crucial for designing new materials.

Purpose of the Study:

• To determine the single crystal X-ray structure of a novel 1,1'-bis(2-nitrophenyl)-5,5'-diisopropyl-3,3'-bipyrazole.
• To compare its structural features with related bipyrazole compounds.
• To investigate molecular geometries and global reactivity parameters using Density Functional Theory (DFT).

Main Methods:

• Single crystal X-ray diffraction analysis was performed to elucidate the solid-state structure.
• Density Functional Theory (DFT) calculations were employed to study molecular geometries and electronic properties.
• Comparative structural analysis was conducted with previously reported bipyrazole derivatives.

Main Results:

• The triclinic crystal structure of 1,1'-bis(2-nitrophenyl)-5,5'-diisopropyl-3,3'-bipyrazole was determined.
• Structural differences were observed when compared to the tetragonal structure of 5,5'-diisopropyl-3,3'-bipyrazole.
• DFT calculations provided insights into the isolated molecule geometries and solid-state packing arrangements.

Conclusions:

• The study successfully characterized a new substituted bipyrazole through X-ray crystallography.
• The findings highlight the influence of substituents on the molecular and crystal structures of bipyrazoles.
• DFT calculations offer a valuable tool for understanding the reactivity and geometry of these compounds.