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  4. Molecular Control of Macroscopic Cubic, Columnar, and Lamellar Organizations in Luminescent Lanthanide-Containing Thermotropic Liquid Crystals
 
research article

Molecular Control of Macroscopic Cubic, Columnar, and Lamellar Organizations in Luminescent Lanthanide-Containing Thermotropic Liquid Crystals

Terazzi, Emmanuel
•
Torelli, Stephane
•
Bernardinelli, Gerald
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2005
Journal of the American Chemical Society

The connection of lipophilic gallic acid derivatives at the 5,5¢- or 6,6¢-positions of the rigid 2,6-bis(1-ethyl-benzimidazol-2-yl)pyridine core provides two pro-mesogenic tridentate ligands L10 and L12, whose molecular shapes, anisometries, and directional intermolecular ð-stacking can be tuned. X-ray diffraction data in the crystalline state, combined with solution 1H NMR measurements, show that complexation with trivalent lanthanides, Ln(III), produces the neutral hemi-disklike complexes [Ln(Li)(NO3)3] i ) 10, 12), which dimerize to give the rodlike bimetallic complexes [Ln2(Li)2(NO3)6] at lower temperature. The relevant thermodynamic parameters for the latter process depend on the nature of the ligand, the size of the metal ion, and the strength of the intermolecular interactions involved in the condensed phase. These three-dimensional models obtained for the complexes in the crystals and in solution are eventually confronted with small-angle XRD profiles recorded in the intermediate thermotropic liquid crystalline phase, in which the rigidity of the packed polyaromatic cores is maintained, while the alkyl chains are molten. According to the specific geometries and nuclearities of the molecular complexes, three types of mesophases (lamellar, columnar, and cubic) can be induced, which provides a direct correlation between the microscopic arrangements and the macroscopic ordering in lanthanide-containing metallomesogens.

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Type
research article
DOI
10.1021/ja0446101
Web of Science ID

WOS:000226463000030

Author(s)
Terazzi, Emmanuel
•
Torelli, Stephane
•
Bernardinelli, Gerald
•
Rivera, Jean-Pierre
•
Benech, Jean-Marc
•
Bourgogne, Cyril
•
Donnio, Bertrand
•
Guillon, Daniel
•
Imbert, Daniel  
•
Buenzli, Jean-Claude G.  
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Date Issued

2005

Published in
Journal of the American Chemical Society
Volume

127

Issue

3

Start page

888

End page

903

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCSL  
Available on Infoscience
February 15, 2006
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/223486
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