Conformational Mobility in Alkyl-Chains of an Anchored Bilayer

Abstract

The conformation of alkyl chains in an anchored bilayer formed by the intercalation of cetyl-trimethyl ammonium ions in layered CdPS3 has been investigated by 13C NMR and infrared spectroscopy at different temperatures. The two techniques return widely differing estimates of gauche conformational disorder with the NMR indicating a much greater extent of disorder. Reconciliation of this difference requires that the observed features in the NMR be dynamically averaged. We show from infrared spectroscopy that the nature of disorder in the anchored bilayer is essentially in the form of kinks (gauche−trans−gauche sequences), and if these are mobile along the length of the alkyl chain on time scales faster than 3.5 ms, they would result in the dynamic averaging of features in the NMR.

Novel insights on magadiite disaggregation: a multitechnique study on thermal stability

“…32 The 13 C NMR, with several peaks in the 29-32.5 ppm range, also indicates that gauche configurations have no preferred location within the chain and can occur anywhere between C 4 and C 13 carbon atoms in the hexadecyl tail of the intercalated CTA ion. 33 The NMR CP dynamics are related to the rigidity/mobility of the organized molecules. The comparison of CTA-magadiite spectra measured at four different contact times (ESI, † Fig.…”

Molecular pillar supported graphene oxide framework: conformational heterogeneity and tunable d-spacing

“…[1][2][3][4][5][6][7][8][9] These hydrocarbon-based surfactants hydrophobize layered materials and show immense potential for the adsorption of organic contaminants such as pyrene, anthracene, azobenzene and phenols. [1][2][3][4][5][6][7][8][9] These hydrocarbon-based surfactants hydrophobize layered materials and show immense potential for the adsorption of organic contaminants such as pyrene, anthracene, azobenzene and phenols.…”

The Effect of Hydrophobicity on the Synthesis of Homogeneous and Nanostructured NiMo-Based Hybrid Materials

“…However, increasing their length progressively shifts this band to lower wavenumbers. This suggests a decrease of the side chain conformational disorder. As a result, more efficient hydrophobic interactions can be established between longer side chains, what leads to the better copolymer organization highlighted by XRD results (Figure ).…”

“…In this context, the length of the alkyl side chains is the key parameter. The side chains do not exist in the all trans conformation mode as the asymmetric stretching band (n as CH2 ) of the CH 2 groups is never observed between 2916 and 2920 cm À1 (Figure 3) [11] . However, increasing their length progressively shifts this band to lower wavenumbers.…”