Nematic phases in ionic melts: mesogenic ionic complexes of silver(I)

Bruce, Duncan W.; Dunmur, D. A.; Maitlis, Peter M.; Styring, Peter; Esteruelas, Miguel A.; Oro, Luis A.; Ros, M. Blanca; Serrano, José Luís; Sola, Eduardo

doi:10.1021/cm00005a001

Cited by 33 publications

(14 citation statements)

References 2 publications

(4 reference statements)

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“…430 On the other hand, a nematic phase was found for the triflate complexes with short alkyl chains. 431 For the compounds with methoxy, ethoxy, and propoxy chains, the nematic phase is monotropic, whereas it becomes enantiotropic for the complex with butoxy chain. The presence of a nematic phase is remarkable because this phase is not expected for ionic liquid crystals.…”

Section: Silver(i) Stilbazole Complexesmentioning

confidence: 99%

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Ionic Liquid Crystals

2005

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Section: Silver(i) Stilbazole Complexesmentioning

confidence: 99%

“…427,430 In an attempt to reduce the transition temperatures, Bruce and co-workers replaced the rigid small inorganic counterions by dodecyl sulfate (DOS). 430,431 This exchange was successful, and the clearing temperatures was lowered from 250°C to about 180°C…”

Section: Silver(i) Stilbazole Complexesmentioning

confidence: 99%

Ionic Liquid Crystals

2005

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“…Anions with a long alkyl chain can also be used. The dodecylsulfate anion has been used very often in the past, for example, to prepare LC silver(I) stilbazole complexes 421,[461][462][463]468 or lanthanide complexes with Schiff's base ligands. 595,596 Alkylsulfate anions have also been used to obtain, for instance, LC N-(n-alkyl)pyridinium salts.…”

Section: Imidazolium-based Mesogens Having a Predominantly Amphiphili...mentioning

confidence: 99%

Ionic Liquid Crystals: Versatile Materials

et al. 2016

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This Review covers the recent developments (2005-2015) in the design, synthesis, characterization, and application of thermotropic ionic liquid crystals. It was designed to give a comprehensive overview of the "state-of-the-art" in the field. The discussion is focused on low molar mass and dendrimeric thermotropic ionic mesogens, as well as selected metal-containing compounds (metallomesogens), but some references to polymeric and/or lyotropic ionic liquid crystals and particularly to ionic liquids will also be provided. Although zwitterionic and mesoionic mesogens are also treated to some extent, emphasis will be directed toward liquid-crystalline materials consisting of organic cations and organic/inorganic anions that are not covalently bound but interact via electrostatic and other noncovalent interactions.

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“…Early studies had indicated that at least six n-alkyl tails were needed on a disklike core in order to obtain a columnar m e s~p h a s e .~~~] Giroud-Godquin et al 17 '* 721 reported four columnar copper P-diketonate complexes 31 ; the phenyls at the ends of the p-diketonate were each substituted (3,4) by two alkyloxy substituents, giving a total of eight tails. These complexes were shown to have a hexagonal columnar (D,,) mesophase by miscibility studies with the triphenylene 29 R?…”

Section: Pheny1)-/ldiketonesmentioning

confidence: 99%

Metallomesogens: Metal Complexes in Organized Fluid Phases

Giroud‐Godquin¹,

Maitlis²

1991

Angew. Chem. Int. Ed. Engl.

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553

148

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Metallomesogens, metal complexes of organic ligands which exhibit liquid crystalline (mesomorphic) character, combine the variety and range of metal-based coordination chemistry with the extraordinary physical properties exhibited by liquid crystals. Thermotropic metallomesogens have been made incorporating many metals, including representatives of s-, p-, dand even f-block elements. Both rodlike (calamitic) and disklike (discotic) thermotropic metallomesogens are known, and examples of all the main mesophase types are found. Many different varieties of ligand can be used: monodentate (4-substituted pyridines), bidentate (P-diketonates, dithiolenes, carboxylates, cyclometalated aromatic amines), or polydentate (phthalocyanines, porphyrins). As with organic mesogens, molecular shape and intermolecular forces play an important role, i.e. the ligands are important in determining mesophase character. The chief requirement for a metallomesogen is a rigid core, usually unsaturated and either rod-or disklike in shape, bearing several long hydrocarbon tails. The metal atom is usually at or near the center of gravity of the molecule. In some cases the ligands are themselves mesogenic, but this is not a requirement. The presence of one or more metals opens many exciting possibilities : new shapes, not easily generated by organic compounds, and hence new properties are then accessible. The incorporation of d-block metals brings with it features such as color and paramagnetism. Profound effects arise from the large and polarizable concentration of electron density that every metal atom possesses, since the molecular polarizability is a key factor in determining whether a molecule will form liquid crystals. Enhanced physical properties (e.g. high birefringencies), as well as new and unexpected ones, will result. A major requirement for metallomesogens to find applications in new device technology is that the metal-ligand bonds are strong and inert and the complexes stable; this can be accomplished with, for example, chelating ligands and the 5d metals.

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Nematic phases in ionic melts: mesogenic ionic complexes of silver(I)

Cited by 33 publications

References 2 publications

Ionic Liquid Crystals

Ionic Liquid Crystals

Ionic Liquid Crystals: Versatile Materials

Metallomesogens: Metal Complexes in Organized Fluid Phases

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