ISSN:
1572-8854
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract The crystal structure of the versatile folk medicine berberine hydrogen sulfate, (C20H18NO4)+HSO 4 − , has been determined by the heavy-atom method and refined by blocked full-matrix least-squares refinement. The crystals are triclinic, space groupF¯1,a=20.370(5),b=7.435(2),c=27.427(6) Å,α=97.700(9),β=116.222(9),γ=85.456.(8)°,Z=8,D x =1.556 g cm−3,D m =1.549(5) g cm−3. The structure refined toR=0.070 for 1659 observed reflections withI(hkl)≧2.5σ[I(hkl)]. The ring system of the berberine molecule is approximately planar, with both −OCH3 groups twisted slightly out of the plane. Heterocyclic ringB has a half-chair conformation with a pseudo-two-fold axis bisecting the bonds C(9)-C(10) and C(7)-C(8), diagonal to the isoquinoline groupAB. The five-membered ringE has an envelope conformation, the apical atom C(1) being out of plane.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01161164
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