Vibrational spectra and the structure of long-chain aliphatic compounds

Babkov, L. M.; Gorshkova, O. V.; Golovina, N. A.; Puchkovskaya, G. A.; Khakimov, I. N.

doi:10.1007/bf02578071

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…4-Alkoxybenzoic acids are well-known for their mesomorphic behavior. − The compounds with a short terminal alkyl chain exhibit a nematic phase, and those with intermediate chain lengths show both a nematic and a smectic C phase; whereas compounds with very long alkyl chains show a smectic C phase only. Information on lanthanide complexes of 4-alkoxybenzoic acids is really scarce, except for some papers on the synthesis and structure of lanthanide(III) benzoates and derivatives thereof. − …”

Section: Introductionmentioning

confidence: 99%

Influence of the Chain Length on the Thermal Behavior of Lanthanide(III) 4-Alkoxybenzoates

et al. 2002

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4-Alkoxybenzoic acids are well-known liquid crystals. The rigid core of the mesogen is formed by intermolecular hydrogen bonds. Layered structures with characteristics that depend on the lanthanide ion are formed when a trivalent lanthanide ion is introduced. Also, the chain length influences the structure and hence the thermal behavior of these complexes. Lanthanide complexes of 4-butyloxybenzoic acid have a low crystallinity, whereas metal complexes with longer chain lengths display several types of layered structures. The thermal behavior of lanthanum(III) and holmium(III) 4-butyloxybenzoate, 4-hexyloxybenzoate, 4-octyloxybenzoate, 4-nonyloxybenzoate, and 4-decyloxybenzoate is discussed, relying on differential scanning calorimetry (DSC), thermooptical microscopy, and synchrotron X-ray diffraction data. A smectic A mesophase was observed for lanthanum(III) 4-hexyloxybenzoate, lanthanum(III) 4-octyloxybenzoate, and lanthanum(III) 4-nonyloxybenzoate. The corresponding holmium(III) compounds are not liquid crystalline.

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Section: Introductionmentioning

confidence: 99%

Influence of the Chain Length on the Thermal Behavior of Lanthanide(III) 4-Alkoxybenzoates

et al. 2002

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“…JR spectra of some carboxylic acid derivatives have been measured in the spectral range of 33-4000 cm' and the temperature interval of 77-500 K and presented in works [1][2][3][4]. The mentioned temperature interval includes regions of solid crystal.…”

Section: Introductionmentioning

confidence: 99%

“…The analysis of nACHCA and nFACHCA experimental spectra, measured at temperature increasing from 100 to 500 K, has shown [1][2][3][4] that several spectral regions contain some changes in the band shapes and intensities, band peak shifts, as well as an appearance of new bands, the number of which grows with the homologue number increasing. Significant changes of nFACHCA JR spectra at temperature increasing and phase transitions have been observed in the spectral regions of 700-1500, 1700 and 2400-3600 cm'.…”

Section: Introductionmentioning

confidence: 99%

Conformational analysis of alkyl- and fluoroalkylcyclohexanecarboxylic acids by infrared spectroscopy methods

Babkov

Puchkovskaya²,

Vedyaeva

2003

SPIE Proceedings

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Modelling of JR spectra has been carried out for alkyl-and fluoroalkylcyclohexanecarboxylic acid sets, which experimental spectra in the temperature range of 77-500 K were received earlier. This modelling took into account the conformational mobility of molecules and the hydrogen bond energy decreasing in H-complexes during heating. Temperature dependent changes of spectra have been shown to be caused by conformational transitions, accompanied with turns of the alkyl (fluoroalkyl) radical or carboxylic groups and the energy decreasing of hydrogen bond during heating.

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Vibrational spectra and the structure of long-chain aliphatic compounds

Cited by 2 publications

References 6 publications

Influence of the Chain Length on the Thermal Behavior of Lanthanide(III) 4-Alkoxybenzoates

Influence of the Chain Length on the Thermal Behavior of Lanthanide(III) 4-Alkoxybenzoates

Conformational analysis of alkyl- and fluoroalkylcyclohexanecarboxylic acids by infrared spectroscopy methods

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