Synthesis and characterization of nanoarchitectures from fatty acid derivatives of 2,6-diaminopyridine and 2-aminopyridine

Abstract

The self-assembling property of lipids makes it an important building block in the field of supramolecular nanoarchitectures with a variety of applications in chemistry, biochemistry, materials science and medicine. We report here, the synthesis and formation of variety of nanostructures such as nanosheets, nanofibers and nanotubes of fatty acid derivatives of 2,6-diaminopyridine and 2-aminopyridine. These molecules possess a saturated or unsaturated long alkyl-chain group as the self-assembling unit. The molecular recognition property of diaminopyridine linker as a result of H-bonding was confirmed by 1 H-NMR and fluorescence spectroscopy and it plays an important role in monitoring the chemical selectivity of supramolecular aggregates toward guest binding. The chemical structures were characterized by Fourier transform-infrared, 1 H-NMR, 13 C-NMR, mass spectra, whereas the morphologies were imaged using scanning electron microscopy and transmission electron microscopy.

Gel Electrolytes with Polyamidopyridine Dendron Modified Talc for Dye-Sensitized Solar Cells

“…The peak at 33 ppm is the evidence of the formation of the products obtained by the Michael addition. A peak observed at 175 ppm is related to the carbonyl carbon atoms of amide group formed with the amidation reaction with 2,6-diaminopyridine, which present the peaks at 104, 113, 140, and 157 ppm . The materials with different generations of PAMPy adsorb CO 2 from air forming carbamate (Figure II) in the same manner as NH 2 -talc, causing the appearance of the signal at 165 ppm. , …”

“…A peak observed at 175 ppm is related to the carbonyl carbon atoms of amide group formed with the amidation reaction with 2,6-diaminopyridine, which present the peaks at 104, 113, 140, and 157 ppm. 41 The materials with different generations of PAMPy adsorb CO 2 from air forming carbamate (Figure 3II) in the same manner as NH 2 -talc, causing the appearance of the signal at 165 ppm. 50,51 Dendron−iodine charge-transfer complexes linked to organotalc lamella were obtained by adsorption of vapor of iodine.…”

“…9,10 The (001) reflection does not change position with the dendron modification of the phyllosilicates. A new peak appears around 18°2θ indicating the intermolecular organization of PAMPy-dendron by engaging in head-to-tail hydrogen bonds between carboxyl and amine groups 39,40 and pyridine ring π−π stacking 41 (Figure 1III). This provides evidence for the formation of supramolecular linear structure that grows parallel to the lamella plane without changing the interlamellar space of the phyllosilicate.…”

Tuning layered superstructures in precision polymers

“…In this study, we demonstrate the importance of supramolecular interactions in governing the structural features of precision polymers incorporating regularly spaced functional groups in linear polyethylene. It is demonstrated that the used 2,6-diaminopyridine (DAP) group capable of introducing interactions via H-bonding 22 or pi-stacking 23 can stabilize different layered superstructures containing up to three monomeric repeating units (refer Scheme 1) along the chain axis. Varying the DAP to methylene units ratio (methylene spacer length) allows for tuning the nature of the layered structures.…”