N-(2-Methyl-phen-yl)-1,2-benzoselen-azol-3(2H)-one

Zero-, one-, two- and three-dimensional supramolecular architectures sustained by Se…O chalcogen bonding: A crystallographic survey

The Cambridge Structural Database was evaluated for crystals containing Se…O chalcogen bonding interactions. These secondary bonding interactions are found to operate independently of complementary intermolecular interactions in about 13% of the structures they can potentially form. This number rises significantly when more specific interactions are considered, e.g. Se…O(carbonyl) interactions occur in 50% of cases where they can potentially form. In about 55% of cases, the supramolecular assemblies sustained by Se…O(oxygen) interactions are one-dimensional architectures, with the next most prominent being zero-dimensional assemblies, at 30%.

2-(3-Methylphenyl)-1,2-benzoselenazol-3(2H)-one

In the title ebselen derivative, C14H11NOSe, the nine-membered benzisoselenazolyl ring system is approximately planar (r.m.s. deviation = 0.021 Å). The dihedral angle between its mean plane and that of the 3-methylphenyl ring is 5.37 (11)°. The five-membered isoselenazolyl ring is severely strained at the Se atom: Se—N = 1.889 (2) Å, Se—Car= 1.882 (3) Å and N—Se—Car= 83.30 (10)°. In the crystal, molecules are linked by C—H...O hydrogen bonds and short intermolecular Se...O contacts of 2.6917 (19) Å, forming chains along thec-axis direction. Neighbouring molecules are linked by offset π–π interactions [intercentroid distance = 3.535 (2) Å]. The chains are also linked by C—H...π interactions, forming a three-dimensional structure.