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The title tridentate ligand, C 14 H 10 N 4 O, N -(quinolin-8-yl)pyrazine-2-carboxamide ( HL1 ), crystallizes with three independent mol-ecules ( A , B and C ) in the asymmetric unit. All three mol-ecules are relatively planar (r.m.s. deviations are 0.068, 0.055 and 0.06 Å, respectively), with the NH H atom forming three-centered (bifurcated) intra-molecular N-H⋯N hydrogen bonds in each mol-ecule. There is also an intra-molecular C-H⋯O contact present in each mol-ecule, involving the benzene ring of the quinoline unit and the amide carboxamide O atom. In the crystal, the three mol-ecules stack in columns with the various mol-ecules being linked by offset π-π inter-actions [inter-centroid distances vary from 3.367 (5) to 3.589 (5) Å], forming layers parallel to the ab plane. The title complex, [Cu 4 (C 42 H 44 N 8 O 16 )]·2CH 3 OH, {hexa-μ-acetato-1:2κ 2  O : O ';2:3κ 8  O : O ';3:4κ 2  O : O '-di-methanol-1κ O ,2κ O -bis-[ N -(quinolin-8-yl)pyrazine-2-carboxamide]-1κ 3  N , N ', N '';4κ 3  N , N ', N ''-tetra-copper(II) methanol disolvate} ( I ), was obtained by the reaction of HL1 with Cu(CH 3 CO 2 ) 2 . It consists of a tetra-nuclear complex with a central tetra-kis-(μ-acetato)-dicopper paddle-wheel moiety linked on either side via bridging acetato ions to a mononuclear copper(II)-( L1 ) complex; it crystallizes as a methanol disolvate. The complex possesses inversion symmetry, being located about a center of symmetry situated at the mid-point of the Cu⋯Cu bond of the paddle-wheel moiety. In the crystal, the complex mol-ecules are linked by O-H⋯O hydrogen bonds, forming chains along the [01] direction, which are linked by offset π-π inter-actions [inter-centroid distance = 3.7367 (11) Å] and C-H⋯O hydrogen bonds, leading to the formation of a supra-molecular framework.

The crystal structures of the ligand N-(quinolin-8-yl)pyrazine-2-carboxamide and of a tetranuclear copper(II) complex