Polymorphism of N-Alkanols: 1-Heptadecanol, 1-Octadecanol, 1-Nonadecanol, and 1-Eicosanol
The polymorphism of 1-heptadecanol (C17H35OH), 1-octadecanol (C18H37OH), 1-nonadecanol (C19H39OH), and 1-eicosanol (C20H41OH) has been studied by X-ray powder diffraction, differential scanning calorimetry (DSC), Raman scattering, and infrared spectroscopy (IR). At room-temperature two monoclinic fo...
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Published in | Chemistry of materials Vol. 14; no. 2; pp. 508 - 517 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
18.02.2002
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Subjects | |
Online Access | Get full text |
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Summary: | The polymorphism of 1-heptadecanol (C17H35OH), 1-octadecanol (C18H37OH), 1-nonadecanol (C19H39OH), and 1-eicosanol (C20H41OH) has been studied by X-ray powder diffraction, differential scanning calorimetry (DSC), Raman scattering, and infrared spectroscopy (IR). At room-temperature two monoclinic forms, β and γ, are observed. For the n-alkanols with an even number of carbons the stable form is γ, whereas β is the stable form for the n-alkanols with an odd number of carbons. On heating, these phases transform to a monoclinic, rotator form R'IV at a few degrees below the melting point. A metastable β form is obtained by quenching from the melt for 1-octadecanol and 1-eicosanol, which is isostructural with the β-phase of the odd alkanols. Cell parameters, temperatures, and enthalpies of the transitions are reported. |
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Bibliography: | istex:86598C15463F3B4741837EAF368BE5C737486648 ark:/67375/TPS-4KDJR3WL-5 |
ISSN: | 0897-4756 1520-5002 |
DOI: | 10.1021/cm011010h |