Studies on supramolecular gel formation using DOSY NMR

N. Nonappa, D. Saman, E. Kolehmainen

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)

Abstract

Herein, we present the results obtained from our studies on supramolecular self-assembly and molecular mobility of low-molecular-weight gelators (LMWGs) in organic solvents using pulsed field gradient (PFG) diffusion ordered spectroscopy (DOSY) NMR. A series of concentration-dependent DOSY NMR experiments were performed on selected LMWGs to determine the critical gelation concentration (CGC) as well as to understand the behaviour of the gelator molecules in the gel state. In addition, variable-temperature DOSY NMR experiments were performed to determine the gel-to-sol transition. The PFG NMR experiments performed as a function of gradient strength were further analyzed using monoexponential DOSY processing, and the results were compared with the automated Bayesian DOSY transformation to obtain 2D plots. Our results provide useful information on the stepwise self-assembly of small molecules leading to gelation. We believe that the results obtained from these experiments are applicable in determining the CGC and gel melting temperatures of supramolecular gels. Copyright (c) 2015 John Wiley & Sons, Ltd.

Original languageEnglish
Pages (from-to)256-260
Number of pages5
JournalMagnetic Resonance in Chemistry
Volume53
Issue number4
DOIs
Publication statusPublished - Apr 2015
MoE publication typeA1 Journal article-refereed

Keywords

  • DOSY
  • VT NMR
  • gel
  • diffusion coefficients
  • DIFFUSION-ORDERED SPECTROSCOPY
  • MOLECULAR-WEIGHT GELATORS
  • GELATION
  • RESOLUTION
  • ORGANOGELATOR
  • RECOGNITION
  • SCATTERING
  • TOOL

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