[1,4]Ditellurino[2,3- b :5,6- b ']di-pyrazine.

[1,4]Ditellurino[2,3- b :5,6- b ']di-pyrazine represents the first reported [1,4]chalcogena[2,3- b :5,6- b ']di-pyrazine containing a heavy chalcogens The asymmetric unit consists of three mol-ecules. In contrast to its sulfur analog, which is planar [Lynch et al. (1994 ▸) Cryst. Struct. Commun. 50 ,1470-1472], C 8 H 4 N 4 Te 2 is folded along the Te⋯Te axis to accommodate the larger chalcogenide atoms. The dihedral angle between the two Te 2 C 2 rings of the central ring is 57.9° (mean of three). C-Te bond lengths range from 2.1105 (16) Å to 2.1381 (17) Å, in good agreement with those predicted by their covalent radii. All Te atoms are involved in inter-molecular Te⋯N contacts, with distances in the range 2.894 (2) to 2.963 (2) Å. These result in a spiral supra-molecular assembly, forming helical columns.