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Crystal structure of a second polymorph of germacrone, C15H22O

Published online by Cambridge University Press:  07 April 2022

James A. Kaduk Open the ORCID record for James A. Kaduk [Opens in a new window] ,
Stacy Gates-Rector Open the ORCID record for Stacy Gates-Rector [Opens in a new window]  and
Thomas N. Blanton Open the ORCID record for Thomas N. Blanton [Opens in a new window]
James A. Kaduk*
Affiliation:
Illinois Institute of Technology, 3101 S. Dearborn St., Chicago, IL 60616, USA North Central College, 131 S. Loomis St., Naperville, IL 60540, USA
Stacy Gates-Rector
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, PA 19073-3273, USA
Thomas N. Blanton
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, PA 19073-3273, USA
*
a)Author to whom correspondence should be addressed. Electronic mail: kaduk@polycrystallography.com
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Abstract

The crystal structure of a new polymorph of germacrone has been solved and refined using synchrotron X-ray powder diffraction data and optimized using density functional theory techniques. This polymorph (Form II) crystallizes in space group C2/c (#15) with a = 26.0073(4), b = 9.84383(10), c = 10.53713(13) Å, β = 95.7547(11)°, V = 2684.04(3) Å3, and Z = 8. The crystal structure is dominated by van der Waals interactions, but four C–H⋯O hydrogen bonds are present. The structure exhibits many similarities to the previously reported Form I polymorph FIQLOG, but is clearly different. The powder pattern has been submitted to ICDD for inclusion in the Powder Diffraction File™ (PDF).

Keywords

germacronepowder diffractionRietveld refinementdensity functional theory
Type
New Diffraction Data
Information
Powder Diffraction , Volume 37 , Issue 2 , June 2022 , pp. 98 - 104
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Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of International Centre for Diffraction Data

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