Syntheses and crystal structures of a new pyrazine dicarboxamide ligand, N2 ,N3 -bis-(quinolin-8-yl)pyrazine-2,3-dicarboxamide, and of a copper perchlorate binuclear complex

Acta Crystallographica. Section E, Crystallographic Communications
Dilovan S Cati, Helen Stoeckli-Evans

Abstract

The title pyrazine dicarboxamide ligand, N2,N3-bis-(quinolin-8-yl)pyrazine-2,3-dicarboxamide (H2L1), C24H16N6O2, has a twisted conformation with the outer quinoline groups being inclined to the central pyrazine ring by 9.00 (6) and 78.67 (5)°, and by 79.94 (4)° to each other. In the crystal, molecules are linked by C-H⋯O hydrogen bonds, forming layers parallel to the (10) plane, which are in turn linked by offset π-π inter-actions [inter-centroid distances 3.4779 (9) and 3.6526 (8) Å], forming a supra-molecular three-dimensional structure. Reaction of the ligand H2L1 with Cu(ClO4)2 in aceto-nitrile leads to the formation of the binuclear complex, [μ-(3-{hy-droxy[(quinolin-8-yl)imino]-meth-yl}pyrazin-2-yl)[(quinolin-8-yl)imino]-methano-lato]bis-[diaceto-nitrile-copper(II)] tris-(per-chlor-ate) aceto-nitrile disolvate, [Cu2(C24H15N6O2)(CH3CN)4](ClO4)3·2CH3CN or [Cu2(HL1-)(CH3CN)4](ClO4)3·2CH3CN (I). In the cation of complex I, the ligand coordinates to the copper(II) atoms in a bis-tridentate fashion. A resonance-assisted O-H⋯O hydrogen bond is present in the ligand; the position of this H atom was located in a difference-Fourier map. Both copper(II) atoms are fivefold coordinate, being ligated by three N atoms of the ligand and ...Continue Reading

References

Dec 25, 2007·Acta Crystallographica. Section A, Foundations of Crystallography·George M Sheldrick
Jan 9, 2015·Acta Crystallographica. Section C, Structural Chemistry·George M Sheldrick
Apr 7, 2016·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Colin R GroomSuzanna C Ward
Aug 9, 2019·Acta Crystallographica. Section E, Crystallographic Communications·Dilovan S Cati, Helen Stoeckli-Evans
Jan 11, 2020·Acta Crystallographica. Section E, Crystallographic Communications·Anthony L Spek
Feb 13, 2020·Journal of Applied Crystallography·Clare F MacraePeter A Wood

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