New H-Bonded Complexes and Their Supramolecular Liquid-Crystalline Organizations

Different approaches to the design of liquid crystals by using H‐bonds were analyzed. A selection of stilbazoles and pyridine compounds, with one or two chelating positions, were used as H‐acceptors in mixtures with carboxylic acids. The noncovalent complexes in question afforded calamitic mesomorph...

Full description

Saved in:
Bibliographic Details
Published in:European Journal of Organic Chemistry 2008-02, Vol.2008 (5), p.826-833
Main Authors: Pérez, Ana, Gimeno, Nélida, Vera, Francisco, Ros, M. Blanca, Serrano, José Luis, De la Fuente, M. Rosario
Format: Article
Language:English
Subjects:
Bent-core liquid crystals
Hydrogen bond
Liquid crystals
Supramolecular chemistry
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Different approaches to the design of liquid crystals by using H‐bonds were analyzed. A selection of stilbazoles and pyridine compounds, with one or two chelating positions, were used as H‐acceptors in mixtures with carboxylic acids. The noncovalent complexes in question afforded calamitic mesomorphism (N, SmA and SmC) as well as a lamellar mesophase (SmCP). Additionally, the liquid crystalline behaviour of the new 2‐hydroxy‐ and 2‐aminopyridine compounds as pure materials is also discussed. Useful results concerning the design and stability of noncovalent calamitic and bent‐core liquid crystals are reported. To induce the bent‐core liquid crystalline order, the conformational flexibility around the H‐bond must be controlled. The new liquid crystals were characterized by IR spectroscopy, optical microscopy, calorimetry, X‐ray diffraction and dielectric spectroscopy.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
ISSN:1434-193X
1099-0690
DOI:10.1002/ejoc.200700725