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In the title compound, [Co(NO 3 ) 2 (C 20 H 18 N 4 )]  n  , the Co II  atom lies on a crystallographic twofold axis and the coordination geometry can be considered as a slightly distorted tetra­hedron defined by two O atoms from two nitrate groups and two N atoms from two ligand mol­ecules. A distorted octa­hedron may be assumed when two of the symmetry-related nitrate O atoms with Co—O distances of 2.3449 (19) Å are added to the coordination environment. Another twofold axis, passing through the middle of the biphenyl bonds, is observed in the crystal structure. A chain is built up by the ligands linking the Co II  ions along [101].

acta crystallographica. section e

catena-Poly[[bis(nitrato-κ2O,O′)cobalt(II)]-μ-4,4′-bis(pyrazol-1-ylmethyl)biphenyl-κ2N2:N2′]