Reduction of the transition temperatures in mesomorphic lanthanide complexes by the exchange of counter-ions

Binnemans, Koen; Galyametdinov, Yu. G.; Collinson, Simon R.; Bruce, Duncan W.

doi:10.1039/a803227k

Cited by 58 publications

(27 citation statements)

References 14 publications

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“…In the last decade, there has been considerable activity in the research field of lanthanide-containing liquid crystals (which are also called lanthanidomesogens). [2,[9][10][11] Different types of ligands were used to design new classes of lanthanidomesogens: Schiff bases, [12][13][14][15][16][17][18][19][20][21][22] β-enamino ketones, [23] alkanoates, [24,25] 4-alkoxybenzoates, [26][27][28] phthalocyanines, [29,[29][30][31][32][33] porphyrins, [34,35] imidazo [4,5-f] [1,10]phenanthrolines, [36] β-diketonates, [37] crown ethers, [38][39][40] 2,6-bis-(benzimidazol-2Ј-yl)pyridines, [11,41,42] and polyoxometalatesurfactant complexes. [43] Most examples of lanthanidomesogens are thermotropic liquid crystals, although some examples of lyotropic lanthanidomesogens have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Liquid‐Crystalline Ternary Rare‐Earth Complexes

et al. 2008

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The thermal behavior of the metallomesogens [Ln-(C 12 C 16 dbm) 3 (phen)] (Ln = La, Nd, Eu, Gd, Tb, Dy, Er, Yb; C 12 C 16 dbm = 1-(4-dodecyloxyphenyl)-3-(4-hexadecyloxyphenyl)propane-1,3-dionate; phen = 1,10-phenanthroline) was investigated. The complexes of the light lanthanides (Ln = La, Nd) are not mesomorphic, whereas the complexes of the heavy lanthanides (Ln = Eu, Gd, Tb, Dy, Er, Yb) exhibit

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Section: Introductionmentioning

confidence: 99%

Liquid‐Crystalline Ternary Rare‐Earth Complexes

et al. 2008

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“…It has been shown in the literature that replacement of chloride ions by dodecylsulfate anions can lead to a dramatic reduction in the transition temperatures of ionic metallomesogens. 29 Bis(2-ethylhexyl)sulfosuccinate has successfully been used to transform a perylene dye into a liquid-crystalline material with a very wide mesophase range. 30 Materials that show mesophase behavior at room temperature have distinct advantages compared to compounds that melt at high temperatures.…”

Section: Introductionmentioning

confidence: 99%

Piperidinium, Piperazinium and Morpholinium Ionic Liquid Crystals

2009

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Piperidinium, piperazinium and morpholinium cations have been used for the design of ionic liquid crystals. These cations were combined with several types of anions, namely bromide, tetrafluoroborate, hexafluorophosphate, dodecylsulfate, bis(trifluoromethylsulfonyl)imide, dioctylsulfosuccinate, dicyclohexylsulfosuccinate, and dihexylsulfosuccinate. For the bromide salts of piperidinium containing one alkyl chain, the chain length was varied, ranging from 8 to 18 carbon atoms (n ) 8, 10,12,14,16,18). The compounds show a rich mesomorphic behavior. High-ordered smectic phases (crystal smectic E and T phases), smectic A phases, and hexagonal columnar phases were observed, depending on the type of cation and anion. The morpholinium compounds with sulfosuccinate anions showed hexagonal columnar phases at room temperature and a structural model for the self-assembly of these morpholinium compounds into hexagonal columnar phases is proposed.

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“…As an example, the Schiff base met- allomesogens 150 (Fig. 150) [131] are shown; a series of other achievements of this research group in this area is reported in [132][133][134][135][136][137][138][139][140][141][142][143][144][145][146][147]. o-Cyclopalladates, such as the cyclopalladated azomethines 151 (Fig.…”

Section: Liquid Crystalsmentioning

confidence: 99%

“…151), belong to a special, most researched group of these compounds [127]. The metallomesogenes [127,[132][133][134][135][136][137][138][139][140][141][142][143][144][145][146][147] include also the lanthanide complexes of ␤-ketoenamines 152 (Fig. 152) [148][149][150].…”

Section: Liquid Crystalsmentioning

confidence: 99%