trans-Diperchloratobis(pyridine-2-carboxamide-N¹,O)copper(II)

Crystals of the title compound, [Cu(ClO₄)₂(C₆H₆N₂O)₂], consist of centrosymmetric complex molecules of [Cu(ClO₄)₂(paa)₂] linked by hydrogen bonding (paa is picolinic acid amide or pyridine-2-carboxamide, (C₆H₆N₂O). The paa ligands are coordinated through their ring N and amide O atoms to form the base of an elongated octahedron [Cu-N 1.967 (2), Cu-O 1.937 (2) Å]. The axial Cu-O distance is 2.649 (3) Å. The sparse structural literature on copper(II)- pyridine-2-carboxamide chelate complexes is discussed.

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