The molecules of (I) form extended layers via intermolecular π– π interactions linking each molecule to its four nearest neighbors, Fig. 2 a, b. Similarly, the two methyl groups are not quite coplanar with a C13-C8-C9-C14 torsion angle of 3.5 (2)°. The methyl groups also lie slightly out of the plane of the C7–N1–C8–C9–N2–C10 ring. The two six-membered rings of the 2,3-dimethylquinoxalin-6-yl group deviate from planarity as well the dihedral angle between a best fit plane through the C5–C6–C7–C10–C11–C12 ring and a best fit plane through the C7–N1–C8–C9–N2–C10 ring is 3.8 (15)°. The 2,3-dimethylquinoxalin-6-yl group is twisted significantly out of the plane of the central phenyl ring as evidenced by the C1-C2-C5-C6 torsion angle of −39.8 (2)°. The C1 and C4 carbon atoms of the central phenyl ring each occupy special positions (, y, ) and thus one-half of the molecule is generated by the symmetry operation (− x + 1, y, − z + ). The molecular structure of (I) (Fig. 1 ) consists of a central phenyl ring with 2,3-dimethylquinoxalin-6-yl groups at the 1 and 3 positions.
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