Studies on supramolecular gel formation using DOSY NMR

0443917 - ÚOCHB 2016 RIV GB eng J - Journal Article
Nonappa, N. - Šaman, David - Kolehmainen, E.
Studies on supramolecular gel formation using DOSY NMR.
Magnetic Resonance in Chemistry. Roč. 53, č. 4 (2015), s. 256-260. ISSN 0749-1581. E-ISSN 1097-458X
Institutional support: RVO:61388963
Keywords : DOSY * VT NMR * gel * diffusion coefficients
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 1.226, year: 2015

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.
Permanent Link: http://hdl.handle.net/11104/0246557