Report on the structure of carbazole, C12H9N

Abstract

Abstract Carbazole, C12H9N, forms orthorhombic crystals with four molecules in the unit cell of dimensions a = 7.82 Å, b = 5.76 Å, c = 19.32 Å. Diffraction effects permit space groups Pnam and Pna21. The intensity-statistics test was not decisive. Structures based on each of the space groups were tried and solved in favour of the centrosymmetric. Parameters were refined by means of two-dimensional Fourier syntheses and the three-dimensional least-squares method, utilizing 700 reflections intensities obtained photographically with CuKα radiation, to an R of 0.19, including unobserved reflections. Bond lengths and bond angles are consistent with the standard values in other similar compounds. The distance of closest approach in adjacent molecules is 3.68 Å.