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Crystal structure of loteprednol etabonate Form II, C24H31ClO7

Published online by Cambridge University Press:  19 January 2021

James A. Kaduk Open the ORCID record for James A. Kaduk [Opens in a new window] ,
Amy M. Gindhart  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, Illinois60616, USA North Central College, 131 S. Loomis St., Naperville, Illinois60540, USA
Amy M. Gindhart
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, Pennsylvania19073-3273, USA
Thomas N. Blanton
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, Pennsylvania19073-3273, USA
*
a)Author to whom correspondence should be addressed. Electronic mail: kaduk@polycrystallography.com
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Abstract

The crystal structure of loteprednol etabonate Form II has been solved and refined using synchrotron X-ray powder diffraction data, and optimized using density functional techniques. Loteprednol etabonate Form II crystallizes in the space group P21 (#4) with a = 11.96312(6), b = 14.91862(5), c = 6.75715(3) Å, β = 94.1584(3)°, V = 1202.796(6) Å3, and Z = 2. The crystal structure is characterized by herringbone layers in the ab-plane. The anisotropic displacement ellipsoid of the Cl atom is not oriented in a way which corresponds to a chemically sensible motion of this atom. The sample suffered damage in the X-ray beam, probably involving photolysis of the C–Cl bond. The most prominent hydrogen bond is the O–H⋯O hydrogen bond between the hydroxyl group and the carbonyl group of the steroid A ring. This hydrogen bond links the molecules into C1,1(9) chains along the b-axis. The powder pattern is included in the Powder Diffraction File™ (PDF®) as entry 00-066-1602; this study will allow inclusion of the atomic coordinates to the PDF entry.

Keywords

loteprednol etabonateAlrexpowder diffractionRietveld refinementdensity functional theory
Type
New Diffraction Data
Information
Powder Diffraction , Volume 36 , Issue 1 , March 2021 , pp. 50 - 55
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of International Centre for Diffraction Data

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