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The molecular nickel complexes trans-diazido-tetrakis(pyrazole)nickel(II) and trans-diazido- tetrakis(3-methylpyrazole)nickel(II) feature terminal monohapto-bound azide ligands. The pyrazole (pyr) ring planes are aligned along the N azide -Ni-N azide  axis by intramolecular N-H···N azide  bonds. The crystal packing is controlled by π-stacking between both pyrazole rings and azide ligands, N-H···N azide  hydrogen bonds, and intermolecular N-H-π pyr  and C-H···N/π azide  interactions.

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Structural Influence of Hydrogen Bonding and π-Stacking in trans-Diazido-tetrakis( pyrazole)nickel(II) and trans-Diazido-tetrakis(3-methylpyrazoIe)nickel(II)