New liquid crystalline 3,4-disubstituted furoxanes

Kauhanka, N. N.; Лапаник, В. И.

doi:10.1080/02678290410001670665

Cited by 3 publications

(6 citation statements)

References 10 publications

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“…The same bridging group influence was found for liquid crystalline 2-aryl-5-alkylthiadiazoles and 2-aryl-5-alkyloxadiazoles with ether and ester linkages [3]. Smectic phases are more typical for 2-isoxazoline-containing esters 12 [20] in contrast to the corresponding isoxazoles 9. Probably this difference in mesomorphic behaviour is caused by the non-planarity of the 2-isoxazoline ring.…”

Section: Mesomorphic Propertiesmentioning

confidence: 50%

“…The phase transition temperatures of the novel synthesized compounds 7-11 and previously described esters 12 [20] are summarized in table 1. Almost all of the synthesized isoxazoles, pyrazoles and 2-isoxazolines with 3-aryl and 5-alkyl substitutes are mesomorphic.…”

Section: Mesomorphic Propertiesmentioning

confidence: 99%

“…Benzylic ethers 11a,c-e were obtained by reaction with the corresponding benzyl chlorides. The synthesis and properties of esters 12f,i,m were described previously [20].…”

Section: Synthesismentioning

confidence: 99%

“…Recently the synthesis and properties of 2-isoxazoline-containing liquid crystals were reported [20][21][22]. Several of these compounds are 2-isoxazolines with 3-aryl and 5-alkyl substitutients [20].…”

Section: Introductionmentioning

confidence: 99%

“…Several of these compounds are 2-isoxazolines with 3-aryl and 5-alkyl substitutients [20]. It is well known that 2-isoxazolines have a versatile synthetic application [23].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Kauhanka

2006

Liquid Crystals

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Section: Mesomorphic Propertiesmentioning

confidence: 50%

Section: Mesomorphic Propertiesmentioning

confidence: 99%

“…Benzylic ethers 11a,c-e were obtained by reaction with the corresponding benzyl chlorides. The synthesis and properties of esters 12f,i,m were described previously [20].…”

Section: Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Several of these compounds are 2-isoxazolines with 3-aryl and 5-alkyl substitutients [20]. It is well known that 2-isoxazolines have a versatile synthetic application [23].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Kauhanka

2006

Liquid Crystals

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Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases

Weber,

da Rosa,

de Araújo

et al. 2025

J. Mater. Chem. C

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Synthesis and thermal behavior of new liquid crystals arylaldoxime esters

Tavares¹,

Arruda²,

Böes³

et al. 2012

J. Braz. Chem. Soc.

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Uma série de cristais líquidos derivados de ésteres arilaldoximas foi sintetizada e caracterizada via espectroscopia de 1 H, 13 C RMN, ATR/IV-FT e análise elementar. A estabilidade química e fotofísica desses compostos foram dependentes dos ciclos de aquecimento e resfriamento, com a decomposição sendo induzida pelo calor. As mudanças nas propriedades durante os ciclos de aquecimento foram acompanhadas através dos respectivos espectros de infravermelho. Todas as amostras se decompõem termicamente, gerando as respectivas nitrilas e ácidos carboxílicos como evidenciado pelos espectros de infravermelho e de 1 H NMR. As propriedades mesomórficas foram avaliadas apenas no primeiro ciclo de aquecimento, devido à decomposição térmica observada após a primeira transição para o estado isotrópico. Espectros de absorção em solventes orgânicos apresentam três bandas entre 230 e 340 nm, e uma banda de emissão, larga e sem estrutura, em 430 nm. Cálculos teóricos ab initio foram realizados para a obtenção de informações estruturais dos ésteres arilaldoximas. We report the synthesis of a series of liquid-crystalline materials based on arylaldoxime esters and the characterization of these materials by 1 H, 13 C NMR, ATR/FT-IR spectroscopy and elemental analysis. The chemical stability and liquid-crystalline as well as photophysical properties of the compounds are described being dependent on the heating/cooling cycles. The changes in chemical stability and the liquid crystals properties of arylaldoxime esters were observed during these thermal cycles by IR analysis. All samples underwent a thermal degradation yielding the corresponding nitriles and carboxylic acid as evidenced by IR and 1 H NMR spectra. Due to the decomposition process, information about the mesomorphic behaviour is lost. The UV-Vis absorption spectra in solution display three absorption bands between 230 and 340 nm. The fluorescence spectra exhibit a broad and structureless emission band located at 430 nm. Ab initio calculations were performed to obtain information on the molecular structure and properties of the title compounds.

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New liquid crystalline 3,4-disubstituted furoxanes

Cited by 3 publications

References 10 publications

Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Synthesis of new liquid crystalline isoxazole‐, pyrazole‐ and 2‐isoxazoline‐containing compounds

Polar-end 3,5-diarylisoxazole liquid crystals with SmA and highly ordered CrE mesophases

Synthesis and thermal behavior of new liquid crystals arylaldoxime esters

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