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Metal ions can act as temporary molecular templates: they bring two thread-like organic components through the same ring, allowing chemists to attach bulky stoppers and make a mechanically interlocked molecule called a [3]rotaxane. In a 2009 study, Alexander I. Prikhod’ko and Jean-Pierre Sauvage demonstrated this strategy with octahedral iron and cobalt complexes. The metal organizes the assembly; it is not the permanent link holding the finished threads together.
What makes a molecule a [3]rotaxane?
A rotaxane consists of ring-shaped and thread-shaped molecular components that are mechanically interlocked. The ring is threaded onto an axle, and bulky end groups—called stoppers—prevent the components from slipping apart. Unlike a conventional molecule whose parts are held together by bonds between them, a rotaxane’s defining connection is this mechanical entanglement.
The “[3]” in this study refers to an arrangement of three components: one ring and two thread-like components passing through it. That is a less common architecture than a single axle passing through two rings. Before stoppers are attached, a threaded assembly that can still come apart is called a pseudorotaxane.
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How did the metal-template strategy work?
Prikhod’ko and Sauvage used octahedral metal coordination to gather ligand-bearing organic fragments into the geometry needed to thread two strings through one macrocyclic ring. Their 2009 paper reports iron(II), cobalt(II), and cobalt(III) templates. The chelating unit was derived from 8,8′-diphenyl-3,3′-bi-isoquinoline.
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- Organize the components. Metal ions coordinate the ligand-bearing fragments, bringing the organic pieces into a favorable arrangement for threading. The metal serves as a template rather than as a permanent structural feature of the intended metal-free product.
- Thread both strings through the ring. The coordinated assembly forms a pseudorotaxane: the ring and two thread-like components are interlocked, but the threads are not yet secured against escape.
- Attach the stoppers. The synthesis uses an open-chain fragment bearing azide end functions, followed by click chemistry with a propargyl ether attached to a bulky group. The resulting end groups block the threads from passing back through the ring.
- Remove the metal template. After stoppering, the authors removed the metal from products under conditions that depended on the metal complex. This left the mechanically interlocked organic architecture without relying on the metal as its permanent connection.
Why the metal and its oxidation state mattered
The reported metals were not interchangeable in every practical respect. The paper describes fast demetalation for the cobalt(II)-complexed stoppered [3]rotaxane. The iron(II) analogue required harsh conditions that were incompatible with the stability of the metal-free rotaxane.
Cobalt(III) offered a different useful property: its kinetically inert coordination helped hold an assembly in place for structural characterization. An X-ray-characterized cobalt(III) pseudorotaxane had a 41-membered ring and two crescent-shaped threaded components. It was a pseudorotaxane intermediate, not evidence that the final metal-free product had the same metal-bound structure.
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What the study established—and what it did not
The 2009 work established a synthetic route to a striking mechanical architecture: two thread-like components through one ring, organized with metal coordination, secured with stoppers, and then separated from the template. The authors also reported a significant stability limitation: the free [3]rotaxane had a half-life of about one week at room temperature in dichloromethane.
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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11That finding makes the distinction between a successful synthesis and a durable device important. The paper demonstrates a way to make [3]rotaxanes; it does not establish that this particular metal-free rotaxane is indefinitely stable or ready for use in a molecular machine. Stimulus-responsive motion, molecular machines, and intelligent materials were broader motivations for rotaxane research, not demonstrated applications of this compound in the study.
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Publication details
Prikhod’ko and Sauvage published “Passing Two Strings through the Same Ring Using an Octahedral Metal Center as Template: A New Synthesis of [3]Rotaxanes” online on April 22, 2009, and in the May 20, 2009 issue of the Journal of the American Chemical Society, volume 131, issue 19, pages 6794–6807. Read the paper’s bibliographic record and abstract.
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