1414976-80-9Relevant academic research and scientific papers
Chromogenic amides of pyridine-2,6-dicarboxylic acid as anion receptors
Wagner-Wysiecka, Ewa,Chojnacki, Jarosaw
, p. 684 - 695,12 (2012)
The synthesis of simple, chromogenic pyridine-2,6-dicarboxylic acid amides, derivatives of isomeric nitroanilines and aminonitrophenols, and their ion binding properties are described. The ligands' response to ionic species was examined by naked eye and was studied with the use of UV-vis spectroscopy in DMSO and its mixture with water. The effect of the localisation and the type of the substituents in aromatic rings were discussed. 1H NMR experiments were carried out to probe the mechanism of anion recognition, i.e. complexation via hydrogen bond formation versus ligand deprotonation. A selective response of N,N-bis(2-hydroxy-4-nitrophenyl)pyridine-2,6-dicarboxamide (L5) towards dihydrogen phosphate was found in both DMSO and DMSO-water (95:5) solvent mixture. The structure of N,N-bis(2-hydroxy-5-nitrophenyl)pyridine-2,6- dicarboxamide (L4) was confirmed by X-ray crystallography.
