Search results
Results From The WOW.Com Content Network
On the molecular level, the interlocked molecules cannot be separated without the breaking of the covalent bonds that comprise the conjoined molecules; this is referred to as a mechanical bond. Examples of mechanically interlocked molecular architectures include catenanes, rotaxanes, molecular knots, and molecular Borromean rings.
In chemistry, molecular Borromean rings are an example of a mechanically-interlocked molecular architecture in which three macrocycles are interlocked in such a way that breaking any macrocycle allows the others to dissociate. They are the smallest examples of Borromean rings.
The interlocked rings rotate with respect to one another. This motion can often be evaluated by NMR spectroscopy, among other methods.When molecular recognition motifs exist in the finished catenane (usually those that were used to synthesize the catenane), the catenane can have one or more thermodynamically preferred positions of the rings with respect to each other (recognition sites).
Rotaxane synthesis can be carried out via a "capping," "clipping, "slipping" or "active template" mechanism. Synthesis via the capping method relies strongly upon a thermodynamically driven template effect; that is, the "thread" is held within the "macrocycle" by non-covalent interactions, for example rotaxinations with cyclodextrin macrocycles involve exploitation of the hydrophobic effect.
In chemistry, molecular Borromean rings are the molecular counterparts of Borromean rings, which are mechanically-interlocked molecular architectures. In 1997, biologist Chengde Mao and coworkers of New York University succeeded in constructing a set of rings from DNA. [44]
A molecular topology is an area in chemistry that involves different mechanically-interlocked molecular architectures. Pages in category "Molecular topology" The following 14 pages are in this category, out of 14 total.
DNA is a particularly useful model of synthetic knot synthesis, as the structure naturally forms interlocked structures and can be easily manipulated into forming knots [16] control precisely the raveling necessary to form knots. Molecular knots are often synthesized with the help of crucial metal ion ligands. [7]
His group reported the synthesis of an advanced mechanically interlocked molecular architecture called molecular Borromean rings through the use of dynamic covalent chemistry. [37] The efficient procedures developed to synthesize these molecular architectures was applied to the construction of molecular switches that operate based on the ...