http://www.cnr.it/ontology/cnr/individuo/prodotto/ID195137

Competition Between Gelation and Crystallisation of a Peculiar Multicomponent Liquid System Based on Ammonium Salts (Articolo in rivista)

Type

Articolo in rivista (Classe)
Prodotto della ricerca (Classe)

Label

Competition Between Gelation and Crystallisation of a Peculiar Multicomponent Liquid System Based on Ammonium Salts (Articolo in rivista) (literal)

Anno

2012-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1039/c2sm07183e (literal)

Alternative label

I. Kapoor, E.-M. Schön, J. Bachl, D. Kühbeck, C. Cativiela, S. Saha, R. Banerjee, S. Roelens, J. J. Marrero-Tellado, D. Díaz Díaz (2012)
Competition Between Gelation and Crystallisation of a Peculiar Multicomponent Liquid System Based on Ammonium Salts
in Soft matter (Print)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

I. Kapoor, E.-M. Schön, J. Bachl, D. Kühbeck, C. Cativiela, S. Saha, R. Banerjee, S. Roelens, J. J. Marrero-Tellado, D. Díaz Díaz (literal)

Pagina inizio

3446 (literal)

Pagina fine

3456 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

8 (literal)

Rivista

Soft matter (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

11 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

12 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Institut fur Organische Chemie, Universitat Regensburg, Germany; Instituto de Sintesis Quimica y Catalisis Homogenea (ISQCH), CSIC-Universidad de Zaragoza, Spain; Physical/Materials Chemistry Division, National Chemical Laboratory, India; Istituto di Metodologie Chimiche (IMC), Consiglio Nazionale delle Ricerche (CNR), Italy; Instituto Universitario de Bio-Organica ''Antonio Gonzalez'', Universidad de La Laguna, Spain; (literal)

Titolo

Competition Between Gelation and Crystallisation of a Peculiar Multicomponent Liquid System Based on Ammonium Salts (literal)

Abstract

An exemplar competition between gelation and crystallisation phenomena was examined with an unusual synergistic multicomponent (organo)gelator solution (MGS), which consists of a well-defined methanolic solution of (1R,2R)-1,2-diaminocyclohexane L-tartrate containing 2.4 equiv. of concentrated hydrochloric acid. The optimal composition of the MGS was determined through meticulous solubility, gelation and structural studies, which support a transient gelation mechanism based on the kinetic self-assembly of the tartrate salt driven by hydrogen-bonding interactions, involving ammonium nitrogen donors and hydroxyl oxygen acceptors, and electrostatic interactions. The hydrochloric acid is involved in the solubilisation of the salt through an ionic dissociationexchange process, which ends up with the formation-precipitation of (1R,2R)-1,2-diaminocyclohexane dihydrochloride. As a consequence, an irreversible destruction of the gel takes place, which indicates the metastable nature of this phase that cannot be accessed from the thermodynamically equilibrated state. Gelation of a variety of oxygenated and nitrogenated solvents with moderate polarity occurred efficiently using extremely low MGS concentrations at low temperatures, and the gel phase was confirmed by dynamic rheological measurements. Several features make the described MGS unique: (1) it is a multicomponent solution where each component and its stoichiometry play a key role in the reproducible formation and stabilization of the gels; (2) it is formed by simple, small, and commercially available chiral building blocks (dissolved in a well-defined solvent system), which are easily amenable for further modifications; (3) the gelation phenomenon takes place efficiently at low temperature upon warming up the isotropic solution, conversely to the typical gel preparation protocol; and (4) the formed organogels are not thermoreversible despite the non-covalent interactions that characterize the 3D-network (literal)

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