Crystal structure of polymeric bis(3-amino-1 H -pyrazole)cadmium dibromide

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The reaction of cadmium bromide tetrahydrate with 3-aminopyrazole (3-apz) in ethanolic solution leads to tautomerization of the ligand and the formation of crystals of the title compound, catena -poly[[dibromidocadmium(II)]-bis(μ-3-amino-1 H -pyrazole)-κ 2 N 3 : N 2 ;κ 2 N 2 : N 3 ], [CdBr 2 (C 3 H 5 N 3 ) 2 ] n or [CdBr 2 (3-apz) 2 ] n . Its asymmetric unit consists of a half of a Cd 2+ cation, a bromide anion and a 3-apz molecule. The Cd 2+ cations are coordinated by two bromide anions and two 3-apz ligands, generating trans -CdN 4 Br 2 octahedra, which are linked into chains by pairs of the bridging ligands. In the crystal, the ligand molecules and bromide anions of neighboring chains are linked through interchain hydrogen bonds into a two-dimensional network. The intermolecular contacts were quantified using Hirshfeld surface analysis and two-dimensional fingerprint plots, revealing the relative quantitative contributions of the weak intermolecular contacts.