Abstract
AbstractElectron density distribution of Di‐2‐pyrazylamine (Hdpza) is studied both by single‐crystal X‐ray diffraction method at 100K and theoretical calculation. Structural determination reveals that Hdpza molecules crystalize in a syn‐anti conformation with an intramolecular CHN hydrogen bond between two pyrazine rings and then gather together via two intermolecular NHN and CHN hydrogen interaction and ππ stacking interaction between pyrazine rings. Charge density analysis is made in terms of deformation density (Δπ), Laplacian distribution and topological analysis of total electron density based on multipole model and theoretical calculation. The agreement between experiment and theory is good. The topological properties at bond critical points of CC and CN bonds reveal a covalent bond character, and those of intermolecular interactions, such as hydrogen bonds and ππ stacking interactions, reveal a closed‐shell interaction. The potential energy curve of Hdpza molecule shows that the syn‐anti conformation is the most stable one (global minima) than the other two of syn‐syn and anti‐anti conformations.
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