Herringbone array of hydrogen‐bonded ribbons in 2‐ethoxybenzamide from high‐resolution X‐ray powder diffraction

In 2‐ethoxybenzamide, C₉H₁₁NO₂, the amide substituents are linked into centrosymmetric head‐to‐head hydrogen‐bonded dimers. Additional hydrogen bonds between adjacent dimers give rise to ribbon‐like packing motifs, which extend along the c axis and possess a third dimension caused by twisting of the 2‐ethoxyphenyl substituent with respect to the hydrogen‐bonded amide groups. The ribbons are arranged in a T‐shaped herringbone pattern and cohesion between them is achieved by van der Waals forces.