Effect of Single-Walled Carbon Nanotube Association upon ¹H NMR Spectra of Amines

Abstract

In order to quantify and study the complexation of small organic amine molecules with SWCNTs, the effect of SWCNT association upon their proton NMR spectra was studied. Results reveal that (1) a greater magnitude of chemical shift change for α protons to the amino group upon SWCNT association suggests close proximity of the amine nitrogen to SWCNTs except for the pyridines, (2) tertiary amines associate strongly with SWCNTs due to the inductive effect outweighing the steric effect of their alkyl parts, (3) in secondary amines, the steric effect overpowers the inductive effect resulting in their weaker interaction than tertiary amines with SWCNTs, (4) introduction of an alkyl substituent at the α position in primary amines results in more effective SWCNT association than at the amino nitrogen in secondary amines, (5) aromatic amines associate more strongly than aliphatic ones due to availability of more points of association, and (6) pyridines seem to interact via their π-electron cloud.

Biogenic synthesis and thermo‐magnetic study of highly porous carbon nanotubes

“…The thinner wall can be observed in Fig. 3 which may be due to the high nitrogen content in the complex as the nitrogen reacts with the sites of carbon to form amides (C–N interaction) [25–27] as shown by FTIR spectra. Hence the growth of nanotubes is hindered.…”

“…after 1000°C, the slight amount of weight is increased because of carbon ash formation. DTG signifies the rate of combustion of the sample; the instant weight loss is observed at 517°C which is 325 µg/min that results in the rapid combustion of nanotube [3,[25][26][27].…”

Ionomer covalent functionalization of single‐walled carbon nanotubes by radical polymerization of zirconium acrylate

“…Single‐walled carbon nanotubes (SWCNTs) and their functionalized derivatives are important materials in nanotechnology, because of their excellent optical, thermal, mechanical, and electronic properties . However, the full advantages of SWCNTs will not be realized until their purity, solubility, and dispersion in organic solvents are resolved . Most potential applications also require chemical modification of SWCNTs by using specific functionalities .…”

The effects of interactions between proline and carbon nanostructures on organocatalysis in the Hajos–Parrish–Eder–Sauer–Wiechert reaction

“…[28][29][30][31] Whilst the nature of interactions between proline and carbon nanostructures is still not definitively understood, the exact mechanism is likely to reflect a number of cooperative forces, including ionic interactions, 32 N-H … π hydrogen bonding interactions 33 and electron transfer interactions. 34,35 Of these, the back-donation of the lone pair electrons from the occupied N non-bonding orbital on proline to the vacant C=C π* antibonding orbitals of the carbon nanotube appears to be the most important factor for controlling the proline-nanotube interaction (Fig. 2).…”