Ambiguities in the X-ray analysis of crystal structures
β Scribed by Franklin, J. N.
- Book ID
- 114521706
- Publisher
- International Union of Crystallography
- Year
- 1974
- Weight
- 464 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0567-7394
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## Abstract The singleβcrystal Xβray structures of speciophylline, mitraphylline, and rhynchophylline, oxindole alkaloids from the Peruvian climbing vine __Uncaria tomentosa__ (Rubiaceae), were determined. The three compounds show Nβ β β Hο£ΏN hydrogen bonding, which has not been observed in the crystal
Optical evidence is presented to support the view that identical diffraction intensity distributions can be produced by objects of considerable diversity; the consequences for X-ray diffraction studies of fibres and other imperfectly crystallized materials are pointed out.