What type of molecular structure is a rotaxane?
Mechanically-interlocked
Covalently bonded
Ionic compound
Metallic lattice
Answer
Mechanically-interlocked molecular structures, such as rotaxanes, are composed of two or more molecules that are interlocked in a way that prevents their separation without breaking covalent bonds. Rotaxanes consist of a dumbbell-shaped molecule (the axle) that is threaded through a ring-shaped molecule (the wheel). The wheel is then stoppered at both ends by bulky groups that prevent it from sliding off the axle.
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