Redetermination of (E)-N,N′-bis(4-bromophenyl)formamidine

oleh: L.-J. Han

Format: Article
Diterbitkan: International Union of Crystallography 2011-05-01

Deskripsi

In comprison with the previous structural study [Anulewicz et al. (1991). Pol. J. Chem. 65, 465–471], for which only the coordinates of all non-H atoms and of some H atoms were reported, the current redetermination of the title compound, C13H10Br2N2, additionally reports anisotropic displacement parameters for all non-H atoms and the coordinates of all H atoms, accompanied by higher accuracy of the geometric parameters. Two independent half-molecules are present in the asymmetric unit, which are completed by a twofold rotation axis as symmetry element. In the crystal, intermolecular N—H...N hydrogen bonds link the molecules into dimers. Linear chains parallel to [102] are formed by intermolecular Br...Br interactions of 3.4328 (7) Å between two Br atoms of adjacent molecules. The dihedral angles between the benzene rings are 50.05 (15) and 75.61 (11)° in the two independent molecules. Owing to the twofold symmetry of the molecules, H atoms attached to the N atoms are only half-occupied, leading to them being disordered over two positions of equal occupancy.