TY - DATA T1 - Synthesis and anion recognition studies of new ureylbenzamide-based receptors PY - 2017/07/17 AU - Bibiana Moreno-Valle AU - Milagros Aguilar-Martínez AU - Adrián Ochoa-Terán AU - Marisela Martínez-Quiroz AU - Valentín Miranda-Soto AU - José García-Elías AU - Karen Ochoa-Lara AU - Victoria Labastida-Galván AU - Mario Ordoñez UR - https://tandf.figshare.com/articles/journal_contribution/Synthesis_and_anion_recognition_studies_of_new_ureylbenzamide-based_receptors/5212549 DO - 10.6084/m9.figshare.5212549 L4 - https://ndownloader.figshare.com/files/8901571 KW - Anion recognition KW - urea KW - benzamide KW - receptor N2 - A new group of ureylbenzamide-based receptors (1–4) has been synthesized; its binding affinity and capacity to form supramolecular complexes in solution with different anions have been investigated. For designing these receptors, it was considered a combination of the positions of the urea and amide groups (ortho and meta), and the chromophore groups naphthyl and nitrophenyl, yielding four receptors. The position and chromophore structure affected the acidity of the urea and amide hydrogens in the order 4>3>2>1. All the spectroscopic studies showed a significant change of 1 and 2 compared with 3 and 4 in the presence of different TBAX salts in acetonitrile. The 1H-NMR spectra show a preferential interaction of the anions with the urea group in receptors 1 and 2 due to the less steric hindrance, while there is a cooperative interaction of amide group in receptors 3 and 4 due to the closeness of both groups. ER -