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New H‐Bonded Complexes and Their Supramolecular Liquid‐Crystalline Organizations
Author(s) -
Pérez Ana,
Gimeno Nélida,
Vera Francisco,
Ros M. Blanca,
Serrano José Luis,
De la Fuente M. Rosario
Publication year - 2008
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.200700725
Subject(s) - chemistry , liquid crystal , mesophase , supramolecular chemistry , crystallography , non covalent interactions , differential scanning calorimetry , lamellar structure , hydrogen bond , organic chemistry , molecule , crystal structure , phase (matter) , materials science , physics , thermodynamics , optoelectronics
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)