| Abstrakt: |
The structure of the retro-isomer of ferrioxamine E sesqui-hydrate, a ferrioxamine E analog in which the N-hydroxy and carbonyl functions are transposed, was found to be isomorphous with that of ferrioxamine E. The interchange of N and C atoms in the three hydroxamate groups seemed to have caused some noticeable differences in the iron-coordination octahedron. The difference in the average Fe–O(N) and Fe–O(C) distances in the retro-isomer, 0.061Å, is about one-half of that observed in case of ferrioxamine E, 0.102Å. The ligand bite of the two complexes is similar (1.27), the retro-isomer has a smaller (42°) twist angle than that (45°) of ferrioxamine E. Crystal data: C27H45N6O9Fe·1.5H2O, triclinic, $${P\bar 1}$$ , a = 19.816(8), b = 10.567(8), c = 7.973(5)Å, α = 106.54(6), β = 94.99(7), γ = 97.92(6)°, V = 1571.1(12)Å3, Z = 2, Dcalc = 1.439g/cm3·λ = 0.71073Å. [ABSTRACT FROM AUTHOR] |
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