Figure 4
The crystal structure of the rotaxane [Fmoc–(Aib)n–O–(CH2)2–NH]2–FUM, n = 4. The axle is shown in blue and the wheel in purple; H atoms have been omitted for clarity. (Fmoc = 9-fluorenylmethoxycarbonyl; Aib = α-aminoisobutyric acid; FUM = central fumardiamide unit.) |