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Molecular Designs for Enhancement of Polarity in Ferroelectric Soft Materials.

Ohtani R, Nakaya M, Ohmagari H, Nakamura M, Ohta K, Lindoy LF, Hayami S - Sci Rep (2015)

Bottom Line: The racemic oxovanadium(IV) salmmen complexes, [VO((rac)-(4-X-salmmen))] (X = C12C10C5 (1), C16 (2), and C18 (3); salmmen = N,N'-monomethylenebis-salicylideneimine) with "banana shaped" molecular structures were synthesized, and their ferroelectric properties were investigated.These complexes exhibit well-defined hysteresis loops in their viscous phases, moreover, 1 also displays liquid crystal behaviour.We observed a synergetic effect influenced by three structural aspects; the methyl substituents on the ethylene backbone, the banana shaped structure and the square pyramidal metal cores all play an important role in generating the observed ferroelectricity, pointing the way to a useful strategy for the creation of advanced ferroelectric soft materials.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.

ABSTRACT
The racemic oxovanadium(IV) salmmen complexes, [VO((rac)-(4-X-salmmen))] (X = C12C10C5 (1), C16 (2), and C18 (3); salmmen = N,N'-monomethylenebis-salicylideneimine) with "banana shaped" molecular structures were synthesized, and their ferroelectric properties were investigated. These complexes exhibit well-defined hysteresis loops in their viscous phases, moreover, 1 also displays liquid crystal behaviour. We observed a synergetic effect influenced by three structural aspects; the methyl substituents on the ethylene backbone, the banana shaped structure and the square pyramidal metal cores all play an important role in generating the observed ferroelectricity, pointing the way to a useful strategy for the creation of advanced ferroelectric soft materials.

No MeSH data available.


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PXRD pattern for the LC phase of 1 at 298 K.
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f2: PXRD pattern for the LC phase of 1 at 298 K.

Mentions: The new banana shaped racemic VO compounds [VO(4-X-salmmen)] (X = C12C10C5 (1), C16 (2) and C18 (3)) incorporating branched and single alkyl chains were synthesized by complexation between VOSO4•nH2O and (rac)-4-X-salmmen303132. Final products were obtained after purification by column chromatography (SiO2, CHCl3). Compound 1 is viscous oil while 2 and 3 are solids at room temperature. Powder X-ray diffraction spectroscopy (PXRD) results demonstrated that 1 is in a liquid crystal (LC) state at 298 K for which sharp peaks in the low angle region and broad scattering halos in the wide angle region were observed; this corroborated its LC nature for which the d spacing value was 33.0 Å (2θ = 2.68°) (Fig. 2). In contrast, 2 and 3 are crystalline phases at 298 K. The branched alkyl chains in 1 likely play a role in decreasing the phase transition temperature of 1.


Molecular Designs for Enhancement of Polarity in Ferroelectric Soft Materials.

Ohtani R, Nakaya M, Ohmagari H, Nakamura M, Ohta K, Lindoy LF, Hayami S - Sci Rep (2015)

PXRD pattern for the LC phase of 1 at 298 K.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4645115&req=5

f2: PXRD pattern for the LC phase of 1 at 298 K.
Mentions: The new banana shaped racemic VO compounds [VO(4-X-salmmen)] (X = C12C10C5 (1), C16 (2) and C18 (3)) incorporating branched and single alkyl chains were synthesized by complexation between VOSO4•nH2O and (rac)-4-X-salmmen303132. Final products were obtained after purification by column chromatography (SiO2, CHCl3). Compound 1 is viscous oil while 2 and 3 are solids at room temperature. Powder X-ray diffraction spectroscopy (PXRD) results demonstrated that 1 is in a liquid crystal (LC) state at 298 K for which sharp peaks in the low angle region and broad scattering halos in the wide angle region were observed; this corroborated its LC nature for which the d spacing value was 33.0 Å (2θ = 2.68°) (Fig. 2). In contrast, 2 and 3 are crystalline phases at 298 K. The branched alkyl chains in 1 likely play a role in decreasing the phase transition temperature of 1.

Bottom Line: The racemic oxovanadium(IV) salmmen complexes, [VO((rac)-(4-X-salmmen))] (X = C12C10C5 (1), C16 (2), and C18 (3); salmmen = N,N'-monomethylenebis-salicylideneimine) with "banana shaped" molecular structures were synthesized, and their ferroelectric properties were investigated.These complexes exhibit well-defined hysteresis loops in their viscous phases, moreover, 1 also displays liquid crystal behaviour.We observed a synergetic effect influenced by three structural aspects; the methyl substituents on the ethylene backbone, the banana shaped structure and the square pyramidal metal cores all play an important role in generating the observed ferroelectricity, pointing the way to a useful strategy for the creation of advanced ferroelectric soft materials.

View Article: PubMed Central - PubMed

Affiliation: Department of Chemistry, Graduate School of Science and Technology, Kumamoto University, 2-39-1 Kurokami, Chuo-ku, Kumamoto, 860-8555, Japan.

ABSTRACT
The racemic oxovanadium(IV) salmmen complexes, [VO((rac)-(4-X-salmmen))] (X = C12C10C5 (1), C16 (2), and C18 (3); salmmen = N,N'-monomethylenebis-salicylideneimine) with "banana shaped" molecular structures were synthesized, and their ferroelectric properties were investigated. These complexes exhibit well-defined hysteresis loops in their viscous phases, moreover, 1 also displays liquid crystal behaviour. We observed a synergetic effect influenced by three structural aspects; the methyl substituents on the ethylene backbone, the banana shaped structure and the square pyramidal metal cores all play an important role in generating the observed ferroelectricity, pointing the way to a useful strategy for the creation of advanced ferroelectric soft materials.

No MeSH data available.


Related in: MedlinePlus