GBABODE, Gabin; NÉGRIER, Philippe; MONDIEIG, Denise; MORENO CALVO, Evelyn; CALVET, Teresa; CUEVAS-DIARTE, Miquel àngel

doi:10.1002/chem.200600955

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GBABODE, Gabin
Centre de physique moléculaire optique et hertzienne [CPMOH]

NÉGRIER, Philippe
Centre de physique moléculaire optique et hertzienne [CPMOH]

MONDIEIG, Denise
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Chemistry - A European Journal. 2007, vol. 13, n° 11, p. 3150-3159

Wiley-VCH Verlag

Résumé en anglais

Crystal structures of the high-temperature phases of odd-numbered fatty acids (CnH2n-1OOH) from tridecanoic acid (C 13H25OOH) to tricosanoic acid (C23H 45OOH) are presented in this article. They have been determined from high-quality X-ray powder-diffraction patterns. Two types of high-temperature phases are adopted: one monoclinic A2/a with Z = 8 for the fatty acids with n=13 and n = 15, denoted as C?, and one monoclinic P21/a with Z = 4 for the longer-chain fatty acids, denoted as C?. It appears that the packing arrangement of the alkyl chains and of the carboxyl groups is similar in all of the structures. However, the arrangement at the methylgroup interface differs between the C? and C? forms. A survey of the intermolecular interactions involved in these polymorphs coupled with a study of the effects of temperature on the structures have led us to a better understanding of the arrangement of the molecules within the high-temperature solid phases of odd-numbered fatty acids.< Réduire

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Van der Waals interactions

Thermal motion

Polymorphism

Hydrogen bonds

Bilayers

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Structures of the High-Temperature Solid Phases of the Odd-Numbered Fatty Acids from Tridecanoic Acid to Tricosanoic Acid

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