Chapter 5 Multiple Choice Questions

. Select from a-d every statement that is correct for rotaxanes.

Not a supramolecular complex

They have a non-trivial topology.

The molecular components can be broken apart under continuous deformation.

Can be prepared using a stoppering strategy

. Select from a-d every statement that is correct for catenanes.

They are composed of interlocked rings.

They contain a mechanical bond(s).

They have a non-trivial topology.

They can be prepared using a clipping strategy.

. Consider the synthesis of the [2]rotaxane below and select from a-d every statement that is correct.

A chemical reaction shows C 6 ring single-bonded with two C (C H 3) 3, single bond N H C O C H 2 C H 2 C H 2 O H plus a cyclic structure of two C 6 ring bonded by two chains of C H 2 O C H 2 C H 2 O C H 2 C H 2 O C H 2, under C H 2 C l 2 and C 6 ring single-bonded with N C O, where left and right meta have i B u, it gives [2] rotaxane.The table headers are labeled additive, and [2] rotaxane yield. The table entries are as follows: Row 1: None, 5 percent. Row 2: N a B P h 4, 80 percent. Row 3: K B P h 4, 25 percent.

The rotaxane yield is enhanced by cation templation.

This is an example of a 'clipping' synthetic strategy of a rotaxane.

This is an example of passive templation.

The rotaxane yield is enhanced by anion templation.

. Consider the rotaxane below that is formed from interlocking a fluorescent dye axle and a cyclodextrin macrocycle. Select from a-d every statement that is correct.
The table headers are labeled additive, and [2] rotaxane yield. The table entries are as follows: Row 1: None, 5 percent. Row 2: N a B P h 4, 80 percent. Row 3: K B P h 4, 25 percent.

The table headers are labeled additive, and [2] rotaxane yield. The table entries are as follows: Row 1: None, 5 percent. Row 2: N a B P h 4, 80 percent. Row 3: K B P h 4, 25 percent.

Aromatic stacking interactions could be used to template the synthesis of this rotaxane.

The hydrophobic effect could be used to template the synthesis of this rotaxane.

The rotaxane will be less fluorescent than the axle alone.

The rotaxane has two possible isomers.

. Select the correct definition for a molecular machine.

A general description for a dynamic, functional molecule that undergoes large-amplitude mechanical motion

A MIM in which molecular components are returned to their original position as soon as the stimulus is removed

A rotaxane in which the macrocycle is stimulated to undergo translational motion between stations on the axle

A type of molecule that contains entangled molecular components

. What is the type of molecular motion represented in the cartoon?
A chemical structure shows a horizontal axle with a vertical ring and an atom at the top of the ring directing to the right is equivalent to a horizontal axle with a vertical ring and an atom at the top of the ring and the ring directs to the left at the bottom.

A chemical structure shows a horizontal axle with a vertical ring and an atom at the top of the ring directing to the right is equivalent to a horizontal axle with a vertical ring and an atom at the top of the ring and the ring directs to the left at the bottom.

Rocking

Pirouetting

Circumrotation

Translation

. What is the type of molecular motion represented in the cartoon?
A chemical structure shows a horizontal ring in an anticlockwise direction is interlocked on the left of a big ring, which is equivalent to another same structure.