Crystal structure of 4,4-dibromo-1-(3,4-dimethoxyphenyl)-2-azabuta-1,3-diene-1-carbonitrile

Abstract

The title compound, C12H10Br2N2O2, represents an example of a planar π-conjugated 2-azabutadiene molecule, which is both an interesting starting material for further organic transformations and a potential ligand in organometallic coordination chemistry. Its metric molecular parameters are typical for the family of 2-azabuta-1,3-dienes not substituted at the (CH) 3-position. In the crystal, the almost planar (r.m.s. deviation = 0.0658 Å) azadiene molecules form one-dimensional double-wide ribbons through intermolecular halogen bonds (C—Br...O and C—Br...Br—C), which then stack in a slipped manner through weak C—H...Br and π–π interactions to generate a three-dimensional network.

Keywords

• crystal structure
• substituted 2-azabuta-1,3-diene
• weak hydrogen bonding
• halogen bonding
• π–π interactions