COA of Formula: C5H7N3In 2021 ,ãSensing a binding event through charge transport variations using an aromatic oligoamide capsuleã?was published in Chemical Science. The article was written by Mateus, Pedro; Jacquet, Antoine; Mendez-Ardoy, Alejandro; Boulloy, Alice; Kauffmann, Brice; Pecastaings, Gilles; Buffeteau, Thierry; Ferrand, Yann; Bassani, Dario M.; Huc, Ivan. The article contains the following contents:
The selective binding properties of a 13-mer oligoamide foldamer capsule composed of 4 different aromatic subunits are reported. The capsule was designed to recognize dicarboxylic acids through multiple-point interactions owing to a combination of protonation/deprotonation events, H-bonding, and geometrical constraints imparted by the rigidity of the foldamer backbone. Compared to tartaric acid, binding of 2,2-difluorosuccinic acid or 2,2,3,3-tetrafluorosuccinic acid resulted in symmetry breaking due to deprotonation of only one of the two carboxylic acid groups of the encapsulated species as shown by NMR studies in solution and by single-crystal X-ray diffraction in the solid state. An analogous 14-mer foldamer capsule terminated with a thiol anchoring group was used to probe the complexation event in self-assembled monolayers on Au substrates. Ellipsometry and polarization-modulation IR absorption-reflection spectroscopy studies were consistent with the formation of a single mol. layer of the foldamer capsule oriented vertically with respect to the surface. The latter underwent smooth complexation of 2,2-difluorosuccinic acid with deprotonation of one of the two carboxylic acid groups. A significant (80-fold) difference in the charge transport properties of the monolayer upon encapsulation of the dicarboxylic acid was evidenced from conducting-AFM measurements (S = 1.1 x 10-9vs. 1.4 x 10-11 ohm-1 for the empty and complexed capsule, resp.). The modulation in conductivity was assigned to protonation of the aromatic foldamer backbone. In the experimental materials used by the author, we found 2,6-Diaminopyridine(cas: 141-86-6COA of Formula: C5H7N3)
2,6-Diaminopyridine(cas: 141-86-6) belongs to pyridine. Pyridine and its simple derivatives are stable and relatively unreactive liquids, with strong penetrating odours that are unpleasant.COA of Formula: C5H7N3