Issue 23, 2002

Novel resorcinarene-based pH-triggered gelator

Abstract

Iminodiacetate resorc[4]arene is shown to produce gels that are pH-reversible. The gels formed are clear and stable to inversion. (The gels are not stable above a certain temperature, which varies with concentration.) When the pH of an iminodiacetate resorc[4]arene solution (concentration >7.6 mM) is lowered to below 2.5, which is near one of the Ka values of the molecule, the dissolved molecules aggregate and cause gelation of water. 1H NMR showed that at the pH of gelation a change occurs in the chemical environment of the iminodiacetate group. Scanning electron microscopy showed that the gel is composed of long strands that interweave and create a molecular mesh.

Article information

Article type
Communication
Submitted
09 Apr 2002
Accepted
10 Oct 2002
First published
28 Oct 2002

Chem. Commun., 2002, 2846-2847

Novel resorcinarene-based pH-triggered gelator

S. R. Haines and R. G. Harrison, Chem. Commun., 2002, 2846 DOI: 10.1039/B203462J

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