Occurrence of Ambient Temperature and Reentrant Smectic Ordering in an Intermolecular Hydrogen Bonding between Alkyl Aniline and Alkoxy Benzoic Acids

Chitravel, T.; Mohan, M. L. N. Madhu

doi:10.1080/15421406.2010.484616

Cited by 27 publications

(8 citation statements)

References 39 publications

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“…(Figure 5 (B)) New reflexes, absent in starting compounds, were observed in samples 6,8,9,11,12, and 14 at compositions from 30 to 80 mol% p-n-heptyloxybenzoic (I) acid.…”

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 90%

“…Figure 7 shows the concentration dependence of the dielectric anisotropy of the smectic and nematic phases for the system composition selected (2,4,6,9,11,12,13,14,16). Experimental data of this work and from [24] show that both acids possess minor positive dielectric anisotropy in the smecticÀnematic phase.…”

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 93%

“…Dielectric measurements showed that for mixtures 6,9,11,12, and 13 lying in the concentration area corresponding to the existence of the co-crystal, the sign changes of dielectric anisotropy. This occurs in the mesophase at a certain temperature (Figure 8).…”

Section: The Dielectric Properties Of the Systemmentioning

confidence: 97%

“…Diffraction patterns were obtained for pure compounds I, II, and samples 2,4,6,8,9,11,12,14, and 16 (see Table 1). The samples 2 and 4 containing I to 25 mol% possess the same structure as the original p-n-undecloxybenzoic acid (II) (Figure 5(A)).…”

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 99%

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Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

et al. 2015

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The system of hydrogen-bonded liquid crystals formed from binary mixtures p-nheptyloxybenzoic (I) acid and p-n-undecloxybenzoic (II) acid has been investigated by polarizing optical microscopy, differential scanning calorimetry, X-ray diffraction, and scattering and dielectric measurements. The TÀX phase diagram was obtained for this system. All mixtures show enantiotropic smectic and nematic phases. The crystalline phase represents a (a, b) solid solution. At the 2:1 ratio of I to II, an intermediate phase À co-crystal g À is formed. The co-crystal g possesses a much wider mesophase range than the corresponding initial components. In contrast to mixtures based on the solid solutions having a positive anisotropy, the co-crystal shows a negative dielectric anisotropy in the mesophase.

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“…(Figure 5 (B)) New reflexes, absent in starting compounds, were observed in samples 6,8,9,11,12, and 14 at compositions from 30 to 80 mol% p-n-heptyloxybenzoic (I) acid.…”

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 90%

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 93%

Section: The Dielectric Properties Of the Systemmentioning

confidence: 97%

Section: X-ray Diffraction Of P-n-heptyloxybenzoic (I)àp-n-undecloxybmentioning

confidence: 99%

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Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

et al. 2015

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“…A number of workers have reported the formation of hydrogen bonding with p-n-alkoxy carboxylic acids and mesogenic or non-mesogenic moieties. [4][5][6][7][8][9][10][11][12][13][14] These non-covalent interactions exhibit great impact on thermal and physical properties like melting points, mesomorphic behaviour, etc. It has been observed that the hydrogen-bonded liquid crystals are synthesised by different proton donor and acceptor groups.…”

Section: Introductionmentioning

confidence: 99%

Thermal and phase behaviour studies of hydrogen-bonded compounds (SA:nOBA) using POM, DSC and image-processing techniques

Rambabu

Prasad

Rao

et al. 2015

Liquid Crystals Today

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A novel series of hydrogen-bonded liquid crystals are synthesised. The hydrogen bond is formed between nonmesogenic salicylic acid and the mesogenic p-n-alkoxy benzoic acids with n = 4-8, 10-12 and 16. The formation of hydrogen bond is confirmed from infrared studies. The transition temperatures and the phase identification are made with the use of polarising microscope (POM) attached with a hot stage. Further, the heats of transition and enthalpies are obtained by employing the differential scanning calorimeter (DSC). Along with POM and DSC, textural image analysis is done by image-processing techniques using MATLAB software and transition temperatures are identified. The results reveal that the compounds with the chain number n = 7, 8, 10-12 show the manifestation of smectic-B phase by quenching smectic-C phase.

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Differential scanning calorimetric investigations of binaries formed between thermotropic liquid crystals

Chandrasekar,

Balaji,

Pongali Sathya Prabu

2024

J Therm Anal Calorim

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Occurrence of Ambient Temperature and Reentrant Smectic Ordering in an Intermolecular Hydrogen Bonding between Alkyl Aniline and Alkoxy Benzoic Acids

Cited by 27 publications

References 39 publications

Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

Study of phase behavior in a system of linear hydrogen-bonded carboxylic acid homologues

Thermal and phase behaviour studies of hydrogen-bonded compounds (SA:nOBA) using POM, DSC and image-processing techniques

Differential scanning calorimetric investigations of binaries formed between thermotropic liquid crystals

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