What year was the crystal structure of a rotaxane reported?
1998
1990
2005
2015
Answer
In 1998, the crystal structure of a rotaxane was reported. Rotaxanes are mechanically interlocked molecules consisting of a dumbbell-shaped molecule (the axle) threaded through a macrocycle (the wheel). The crystal structure provided direct evidence for the threading of the axle through the wheel, confirming the proposed structure of rotaxanes.
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