N-butylthiophene-3-carboxamide and 2-benzylseleno-N-butylthiophene-3-carboxamide at 130 K

Abstract

In N-butylthiophen-3-carboxamide, C9H13NOS, the N-butylcarboxamide group is almost planar with the aromatic thiophene ring, with the amide N atom cis to C2. In the 2-benzylseleno derivative, C16H19NOSSe, the N-butylcarboxamide group adopts an orientation with the amide O atom cis to C2 and forming a close contact with the Se atom. In both compounds, the amide N atom is involved in hydrogen bonding with the O atom of an adjacent molecule forming zigzag chains.