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Gel Sculpture: Moldable, Load-Bearing and Self-Healing Non-Polymeric Supramolecular Gel Derived from a Simple Organic Salt

Sahoo, Pathik and Sankolli, Ravish and Lee, Hee-Young and Raghavan, SrinivasaR and Dastidar, Parthasarathi (2012) Gel Sculpture: Moldable, Load-Bearing and Self-Healing Non-Polymeric Supramolecular Gel Derived from a Simple Organic Salt. In: CHEMISTRY-A EUROPEAN JOURNAL, 18 (26). pp. 8057-8063.

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Official URL: http://dx.doi.org/10.1002/chem.201200986

Abstract

An easy access to a library of simple organic salts derived from tert-butoxycarbonyl (Boc)-protected L-amino acids and two secondary amines (dicyclohexyl- and dibenzyl amine) are synthesized following a supramolecular synthon rationale to generate a new series of low molecular weight gelators (LMWGs). Out of the 12 salts that we prepared, the nitrobenzene gel of dicyclohexylammonium Boc-glycinate (GLY.1) displayed remarkable load-bearing, moldable and self-healing properties. These remarkable properties displayed by GLY.1 and the inability to display such properties by its dibenzylammonium counterpart (GLY.2) were explained using microscopic and rheological data. Single crystal structures of eight salts displayed the presence of a 1D hydrogen-bonded network (HBN) that is believed to be important in gelation. Powder X-ray diffraction in combination with the single crystal X-ray structure of GLY.1 clearly established the presence of a 1D hydrogen-bonded network in the xerogel of the nitrobenzene gel of GLY.1. The fact that such remarkable properties arising from an easily accessible (salt formation) small molecule are due to supramolecular (non-covalent) interactions is quite intriguing and such easily synthesizable materials may be useful in stress-bearing and other applications.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to WILEY-V C H VERLAG GMBH,
Keywords: crystal engineering;gels;gelators;X-ray diffraction; supramolecular chemistry
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 17 Jul 2012 11:28
Last Modified: 17 Jul 2012 11:28
URI: http://eprints.iisc.ernet.in/id/eprint/44834

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