Invited Article

Malthête, Jacques; Nguyen, H. T.; Destrade, C.

doi:10.1080/02678299308026292

Cited by 193 publications

(59 citation statements)

References 33 publications

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“…The Schiff-base ligand LH 3 is itself mesomorphic, not totally unexpected, because of its polycatenar-like molecular structure, a priori compatible with mesophase formation. [17] Observation by polarizing optical microscopy (POM) indicated a monotropic liquid-crystalline phase behavior. On heating the sample, an isotropic liquid is obtained at 82°C, which was confirmed by an intense endothermic peak transition (82 kJ·mol -1 ) in the first heating run of the DSC curve.…”

Section: Resultsmentioning

confidence: 99%

Dinuclear Lanthanide Schiff‐Base Complexes Forming a Rectangular Columnar Mesophase

et al. 2005

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Section: Resultsmentioning

confidence: 99%

Dinuclear Lanthanide Schiff‐Base Complexes Forming a Rectangular Columnar Mesophase

et al. 2005

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“…[23,29] A transition from lamellar mesophases (with flat interfaces) to columnar mesophases (with curved interfaces), via an intermediate cubic structure, is typically found for tetracatenar liquid crystals. [46][47][48][49][50][51] This is explained by the increase in the aliphatic volume fraction with temperature and/or chain length. To compensate for this increase, the rigid cores will tilt to the extent that tilting is no longer sufficient, and undulations start to occur.…”

Section: Abstract In Dutchmentioning

confidence: 95%

T‐Shaped Ionic Liquid Crystals Based on the Imidazolium Motif: Exploring Substitution of the C‐2 Imidazolium Carbon Atom

Goossens

Wellens

Hecke

et al. 2011

Chemistry A European J

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In this contribution the first examples of so-called rigid-core, T-shaped imidazolium ionic liquid crystals, in which the C-2 atom of the imidazolium ring is substituted with an aryl moiety decorated with one or two alkoxy chains, are described. The length of the alkoxy chain(s) was varied from six to eighteen carbon atoms (n=6, 10, 14-18). Whereas the compounds with one long alkoxy chain display only smectic A phases, the salts containing two alkoxy chains exhibit smectic A, multicontinuous cubic, as well as hexagonal columnar phases, as evidenced by polarising optical microscopy, differential scanning calorimetry, and powder X-ray diffraction. Structural models are proposed for the self-assembly of the molecules within the mesophases. The imidazolium head groups and the iodide counterions were found to adopt a peculiar orientation in the central part of the columns of the hexagonal columnar phases. The enantiotropic cubic phase shown by the 1,3-dimethyl-2-[3,4-bis(pentadecyloxy)phenyl]imidazolium iodide salt has a multicontinuous Pm ̄3m structure. To the best of our knowledge, this is the first example of a thermotropic cubic mesophase of this symmetry.

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“…4b). [23] Consequently, the molecules pack on top of each other and form columns possessing at least one degree of orientational order (nematic columnar, N Col ), which can be completed with additional degrees of positional orders when intercolumnar interactions become sizeable (hexagonal (Col h ), rectangular (Col r ), or oblique (Col o ) columnar). [1,20] The Col h reported for the hexacatenar ligand L12 can thus be simply assigned to the two-dimensionally curved interface produced by the divergent connection of the dodecyloxy chains to the terminal gallic acid residues (Fig.…”

Section: Feature Articlementioning

confidence: 99%

Introducing Bulky Functional Lanthanide Cores into Thermotropic Metallomesogens: A Bottom‐Up Approach

Terazzi

Suárez

Torelli

et al. 2006

Adv Funct Materials

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Basic thermodynamic considerations are used to rationalize the formation of thermotropic mesophases incorporating aromatic ligands for trivalent lanthanide metal ions (Ln). Standard flat and bent molecular interfaces, separating the central binding unit from the lateral, flexible alkoxy chains, provide programmed lamellar and columnar organization in the mesophases, which are removed upon complexation to Ln(NO3)3 and Ln(CF3CO2)3. Only significantly curved aromatic/aliphatic interfaces, found in polycatenar ligands, are able to overcome the considerable perturbations of the intermolecular interactions produced by the introduction of the bulky metallic core. A rich mesomorphism results, which can be tuned by a judicious control of the metallic coordination sphere. The exploitation of specific, metal-centered luminescence for probing phase transitions and microscopic environments in mesophases is also discussed, as is the use of ionic liquids for producing tunable luminescent mesophases

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Invited Article

Cited by 193 publications

References 33 publications

Dinuclear Lanthanide Schiff‐Base Complexes Forming a Rectangular Columnar Mesophase

Dinuclear Lanthanide Schiff‐Base Complexes Forming a Rectangular Columnar Mesophase

T‐Shaped Ionic Liquid Crystals Based on the Imidazolium Motif: Exploring Substitution of the C‐2 Imidazolium Carbon Atom

Introducing Bulky Functional Lanthanide Cores into Thermotropic Metallomesogens: A Bottom‐Up Approach

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