Abstract
The title compound, C18H10Cl2N4, synthesized by the condensation reaction between 4,5-dichlorobenzene-1,2-diamine and 1,2-di(pyridin-2-yl)ethane-1,2-dione in boiling acetic acid, has a nearly planar quinoxaline moiety [maximum deviation = 0.070 (1) Å] whose mean plane makes dihedral angles of 40.51 (2) and 39.29 (3)° with the pyridine rings. Within the unit cell, there are no classical hydrogen bonds. Molecules in the structure pack with π–π stacking contacts between the quinoxaline units and nearby pyridine rings with an intercentroid distance of 3.7676 (9) Å.
Highlights
The title compound, C18H10Cl2N4, synthesized by the condensation reaction between 4,5-dichlorobenzene-1,2-diamine and 1,2-di(pyridin-2-yl)ethane-1,2-dione in boiling acetic acid, has a nearly planar quinoxaline moiety [maximum deviation = 0.070 (1) A ] whose mean plane makes dihedral angles of 40.51 (2) and 39.29 (3) with the pyridine rings
Supporting information for this paper is available from the IUCr electronic archives (Reference: HG5423)
We have found that quinoxalines make interesting ligands when combined with metals, especially silver(I) salts (Rasmussen et al, 1990; Bu et al, 2001; Crundwell, 2013; Crundwell et al, 2014)
Summary
The title compound, C18H10Cl2N4, synthesized by the condensation reaction between 4,5-dichlorobenzene-1,2-diamine and 1,2-di(pyridin-2-yl)ethane-1,2-dione in boiling acetic acid, has a nearly planar quinoxaline moiety [maximum deviation = 0.070 (1) A ] whose mean plane makes dihedral angles of 40.51 (2) and 39.29 (3) with the pyridine rings. Molecules in the structure pack with – stacking contacts between the quinoxaline units and nearby pyridine rings with an intercentroid distance of 3.7676 (9) A . For the structures of similar compounds, see: Wozniak (1991); Rasmussen et al (1990); Crundwell et al (2010, 2014); Jaso et al (2005); Bu et al (2001); Cantalupo et al (2010); Crundwell (2013).
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