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Crystal structure of salmeterol xinafoate form I (Serevent®Diskus®), (C25H37NO4)(C11H8O3)

Published online by Cambridge University Press:  11 November 2015

James A. Kaduk ,
Kai Zhong ,
Amy M. Gindhart  and
Thomas N. Blanton
James A. Kaduk*
Affiliation:
Illinois Institute of Technology, 3101 S. Dearborn St., Chicago, Illinois 60616
Kai Zhong
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, Pennsylvania 19073-3273
Amy M. Gindhart
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, Pennsylvania 19073-3273
Thomas N. Blanton
Affiliation:
ICDD, 12 Campus Blvd., Newtown Square, Pennsylvania 19073-3273
*
a)Author to whom correspondence should be addressed. Electronic mail: [email protected]
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Abstract

The crystal structure of salmeterol xinafoate has been solved and refined using synchrotron X-ray powder diffraction data, and optimized using density functional techniques. Salmeterol xinafoate crystallizes in space group P−1 (#2) with a = 9.173 89(13), b = 9.483 79(14), c = 21.3666(4) Å, α = 82.2646(13), β = 85.2531(12), γ = 62.1565(11)°, V = 1628.37(5) Å3, and Z = 2. Key to the structure solution was linking the two fragments by a Li atom along the expected N–H···O hydrogen bond. The salmeterol cation and xinafoate anion are linked by N–H···O and O–H···O hydrogen bonds, interactions which cause the salmeterol to adjust its conformation. The hydrogen bonds result in complex chains along the b-axis. The powder pattern is included in the Powder Diffraction File™ as entry 00-065-1430.

Keywords

salmeterol xinafoateSerevent Diskuspowder diffractionRietveld refinementdensity functional theory
Type
Technical Articles
Information
Powder Diffraction , Volume 30 , Issue 4 , December 2015 , pp. 333 - 339
Copyright
Copyright © International Centre for Diffraction Data 2015 

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