Abstract
The mol-ecule of the title compound, C30H22N4, exhibits inversion symmetry adopting the shape of a St Andrew's Cross. It shows dihedral angles between adjacent aryl units of around 50° whereas torsion angles of ca 10° are found along the aryl-ene vinyl-ene path.
Highlights
The molecule of the title compound, C30H22N4, exhibits inversion symmetry adopting the shape of a St Andrew’s Cross. It shows dihedral angles between adjacent aryl units of around 50 whereas torsion angles of ca 10 are found along the arylene vinylene path
Torsion angles along the distyryl axis are À170.21 (15), and À169.56 (14)
The title compound was prepared from 2,5-dimethyl-3,6-di(2-pyridyl)pyrazine (Kolb, 1896) (0.08 g) and benzaldehyde (0.13 g) in 35 ml of DMF by the action of 0.34 g potassium t-butylate
Summary
The title compound 2,5-(E,E)-distyryl-3,6-di-(2-pyridyl)pyrazine, C30H22N4, was prepared as a reference chromophore in a project on pyrazine-centered materials, solvatochromic dyes (Schmitt et al, 2008, Wink & Detert, 2013) and liquid crystals (Roder et al, 2019; Schmitt et al, 2011). The molecule has the shape of a centrosymmetrical St Andrew’s cross (Fig. 1). The central pyrazine ring as well as the vinylene groups and the peripheral pyridine and phenyl rings are totally planar. A dihedral angle of 48.07 (6) at the teraryl axis is nearly identical to those in a related compound with phenyl rings (50.8, 48.6, Schmitt et al, 2013). Torsion angles along the distyryl axis are À170.21 (15), (phenyl-vinyl) and À169.56 (14) (vinyl-pyrazine).
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