Crystal structure of 1,3,4,5,6,8-hexachlorothieno[2,3-c:5,4-c′]dipyridine

Abstract

Crystals of the title compound (I) are triclinic, a= 9·07(1), b= 11·37(1), c= 7·10(1)Å, α= 111·1(2)°, β= 90·0(2)°, γ= 105·7(2)°, Z= 2, space group P. The structure was determined from precession data by Fourier and least-squares methods, the final R being 5·9% for 1062 non-zero reflections. The analysis revealed the overcrowded nature of the molecule, the two chlorine atoms in the overcrowded region being displaced from the best least-squares plane through the thienodipyridine group by 0·61 and –0·62 Å, respectively.