C-H center dot center dot center dot O or N-H center dot center dot center dot O hydrogen bonded biomimetic dimerized rectangular secondary structural motifs formed by L-shaped fatty acid-substituted nicotinamide salts with PF6-, BF4-, NO3- and Br- anions

摘要

A series of 3-carbamoyl-1-(10-carboxydecyl)pyridin-1-ium salts with four anions (PF6- (1), BF4- (2), NO3- ( 3), and Br- (4)) have been synthesized and characterized by single-crystal X-ray diffraction. All four salts have a primary L-shaped cation conformation, and each pair of cations forms a similar well-defined rectangular motif of nicotinamide cations and fatty acid groups via N-H center dot center dot center dot O or C-H center dot center dot center dot O hydrogen bonding. The effects on hydrogen-bonding motifs, building blocks and structures of the four anion species with different hydrogen-bonding acceptor abilities, sizes and shapes are discussed.