title: Nonpolymeric hydrogelator derived from N-(4-pyridyl)isonicotinamide.
abstract: A series of pyridyl amides derived from isonicotinic acid, nicotinic acid, and benzoic acid have been synthesized. Only N-(4-pyridyl)isonicotinamide 1 is found to be an efficient hydrogelator with a minimum gelator concentration of 0.37 wt %. A wide range of concentrations (0.37-20 wt %) could be used to form hydrogels. The other amides, namely, N-(3-pyridyl)isonicotinamide 2, N-(2-pyridyl)isonicotinamide 3, N-(phenyl)isonicotinamide 4, N-(4-pyridyl)nicotinamide 5, N-(3-pyridyl)nicotinamide 6, and N-(4-pyridyl)benzamide 7, did not show any gelation properties. Fourier transform infrared spectroscopy, variable temperature 1H NMR, single-crystal diffraction and X-ray powder diffraction (XRPD), and scanning electron microscopy have been used to characterize the gel. Single-crystal diffraction and XRPD studies indicate that the morph responsible for gel formation is different from that in its bulk solid and xerogel.
authors.affiliation: Analytical Science Discipline, Central Salt & Marine Chemicals Research Institute, G. B. Marg, Bhavnagar-364 002, Gujarat, India.
authors.forename: D Krishna
authors.initials: DK
authors.lastname: Kumar
authors.forename: D Amilan
authors.initials: DA
authors.lastname: Jose
authors.forename: Parthasarathi
authors.initials: P
authors.lastname: Dastidar
authors.forename: Amitava
authors.initials: A
authors.lastname: Das
mesh_terms: D000577:Amides / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D020100:Hydrogels / Q000138:chemical synthesis* / Q000737:chemistry; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D010316:Particle Size; D011725:Pyridines / Q000138:chemical synthesis* / Q000737:chemistry
chemical_list: D000577:Amides; D020100:Hydrogels; C509599:N-(4-pyridyl)isonicotinamide; D011725:Pyridines; D009536:Niacinamide