A SAXS-WAXS study of the endothermic transitions in amorphous or supercooled liquid itraconazole
Abstract
Small and wide angle high energy x-ray scattering experiments were performed upon cooling itraconazole from the melt to investigate the structural origin of the two transitions at ~74 °C and ~90 °C observed in DSC measurements. Slight changes to the main WAXS peak at Q = 1.33 ± 0.01 Å –1 were observed at 90 °C and are found to be inter-molecular in nature, suggesting a liquid to isotropic transition. This finding was supported by complementary wide angle neutron scattering measurements. For temperatures at and below ~74 °C two strong rings appear in the 2D-SAXS pattern at Q = 0.24 ± 0.01 Å –1 and 0.43 ± 0.01 Å –1. The SAXS spectra were further deconvoluted into sharp and broad components. Lastly, a narrowing of the broad component is associated with only minor changes in the packing arrangements of the itraconazole molecules below ~90 °C, while the appearance of the sharp component below ~74 °C is attributed to the formation of a polydomain lamellar phase.
- Authors:
-
- Argonne National Lab. (ANL), Argonne, IL (United States); Arizona State Univ., Tempe, AZ (United States)
- Arizona State Univ., Tempe, AZ (United States)
- Univ. of Sheffield, Sheffield (United Kingdom)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Purdue Univ., West Lafayette, IN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- OSTI Identifier:
- 1329117
- Alternate Identifier(s):
- OSTI ID: 1364641; OSTI ID: 1396821
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357; AC02-06CH1135
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Thermochimica Acta
- Additional Journal Information:
- Journal Volume: 644; Journal Issue: C; Journal ID: ISSN 0040-6031
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE
Citation Formats
Benmore, C. J., Mou, Q., Benmore, K. J., Robinson, D. S., Neuefeind, J., Ilavsky, J., Byrn, S. R., and Yarger, J. L. A SAXS-WAXS study of the endothermic transitions in amorphous or supercooled liquid itraconazole. United States: N. p., 2016.
Web. doi:10.1016/j.tca.2016.10.004.
Benmore, C. J., Mou, Q., Benmore, K. J., Robinson, D. S., Neuefeind, J., Ilavsky, J., Byrn, S. R., & Yarger, J. L. A SAXS-WAXS study of the endothermic transitions in amorphous or supercooled liquid itraconazole. United States. doi:10.1016/j.tca.2016.10.004.
Benmore, C. J., Mou, Q., Benmore, K. J., Robinson, D. S., Neuefeind, J., Ilavsky, J., Byrn, S. R., and Yarger, J. L. Fri .
"A SAXS-WAXS study of the endothermic transitions in amorphous or supercooled liquid itraconazole". United States. doi:10.1016/j.tca.2016.10.004. https://www.osti.gov/servlets/purl/1329117.
@article{osti_1329117,
title = {A SAXS-WAXS study of the endothermic transitions in amorphous or supercooled liquid itraconazole},
author = {Benmore, C. J. and Mou, Q. and Benmore, K. J. and Robinson, D. S. and Neuefeind, J. and Ilavsky, J. and Byrn, S. R. and Yarger, J. L.},
abstractNote = {Small and wide angle high energy x-ray scattering experiments were performed upon cooling itraconazole from the melt to investigate the structural origin of the two transitions at ~74 °C and ~90 °C observed in DSC measurements. Slight changes to the main WAXS peak at Q = 1.33 ± 0.01 Å–1 were observed at 90 °C and are found to be inter-molecular in nature, suggesting a liquid to isotropic transition. This finding was supported by complementary wide angle neutron scattering measurements. For temperatures at and below ~74 °C two strong rings appear in the 2D-SAXS pattern at Q = 0.24 ± 0.01 Å–1 and 0.43 ± 0.01 Å–1. The SAXS spectra were further deconvoluted into sharp and broad components. Lastly, a narrowing of the broad component is associated with only minor changes in the packing arrangements of the itraconazole molecules below ~90 °C, while the appearance of the sharp component below ~74 °C is attributed to the formation of a polydomain lamellar phase.},
doi = {10.1016/j.tca.2016.10.004},
journal = {Thermochimica Acta},
number = C,
volume = 644,
place = {United States},
year = {2016},
month = {10}
}
Search WorldCat to find libraries that may hold this journalWeb of Science