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Ab initio structure determination of anhydrous sodium alendronate from laboratory powder X-ray diffraction data

✍ Scribed by Minakshi Asnani; K. Vyas; Apurba Bhattacharya; Surya Devarakonda; Santu Chakraborty; Alok Kumar Mukherjee

Publisher
John Wiley and Sons
Year
2009
Tongue
English
Weight
292 KB
Volume
98
Category
Article
ISSN
0022-3549

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✦ Synopsis

Sodium alendronate, a member of bisphosphonate class of compounds commonly used for treatment of generalized bone disorders, exists in various hydrated forms. Dehydration of sodium alendronate trihydrate has been studied using variable temperature X-ray powder diffraction technique. The crystal structure of anhydrous sodium alendronate, prepared by heating the trihydrate sodium alendronate at 1508C, has been determined from X-ray powder data using direct space global optimization technique for structure solution, followed by the Rietveld refinement. The structure of the anhydrous form of sodium alendronate is compared with that of the trihydrate form, which was determined previously from single crystal X-ray diffraction data. Both anhydrous and trihydrate sodium alendronate crystallize in monoclinic system with space group P2 1 /n. The crystal structure of the anhydrous sodium alendronate is built by edge-sharing of NaO 6 octahedra into a two-dimensional molecular sheet in the (011) plane, whereas in the trihydrate compound, one-dimensional chain along the (010) direction is generated by corner sharing of NaO 6 octahedra.

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