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Nanoscale Borromean Links

Nanoscale Borromean Links - The nontrivial link known as the Borromean rings has long been a source of endless fascination among artists, theologians, mathematicians, and scientists. The molecular construction of the Borromean Ring (BR) topology represents a formidable synthetic challenge as they consist of three mutually interlocked, yet noncatenated more...



Pretzelanes Go Nano

Through its exploitation of noncovalent bonding interactions and self-assembly processes, supramolecular assistance to covalent synthesis has established itself as an efficient means of creating molecules with nanoscale dimensions. For two decades, researchers have harnessed the power of post-assembly covalent modification to produce an array more...



Producing Dendritic Nanostructures using Dynamic Chemistry

For over 40 years, the synthesis of exotic molecules such as catenanes, rotaxanes, knots and Borromean rings with aesthetically appealing and useful applications has been proceeding apace. During the same period of time, the synthetic protocols employed by chemists have evolved from being all statistical in the beginning, to progressively covalent, more...



Multivalent Carbohydrate-Protein Interactions Through Self-Assembly

Two of the central building blocks of life are proteins and carbohydrates. The interactions between these two disparate types of biomolecules play a role in numerous biological processes and are critical to the onset, detection, and, potentially, prevention,of human diseases such as cancer. Despite the importance of  these interactions, the more...



Nanoelectronics: From Solutions to Devices

The field of molecular electronics is teeming with results, rationalizations and speculations from many research laboratories. At the heart of this field is the drive to construct molecular electronic devices that exhibit and take advantage of the rich set of molecular properties which are under modular chemical control through contemporary more...



The Next Generation of Switchable Rotaxanes for Nanoelectronics

In recent years, developments in the area of mechanically interlocked molecules designed to act as artificial molecular switches and machines have proceeded apace. The potential applications of these molecules varies widely and includes nanoelectronics and nanoelectromechanical devices. Many different control stimuli have also been demonstrated, more...



Operating Nanoelevators

Natural molecular machines, such as ATP-synthase, myosin, kinesin, or dynein are complex and inspiring biological assemblies whose structures and working mechanisms have been elucidated in a few cases. These intriguing systems have prompted scientists to design and build artificial molecular machines by mimicking their biological counterparts. more...



Linear Artificial Molecular Muscles for Mechanical Nanoactivation

Two switchable, palindromically-constituted bistable [3]rotaxanes have been designed and synthesized (Appl. Phys. Lett. 2004, 85, 5391- 5393) with a pair of mechanically-mobile rings encircling a single dumbbell. These designs are reminiscent of a “molecular muscle” for the purposes of amplifying and harnessing molecular more...



Operational Nanovalves

In everyday life, macroscopic valves control the flow of fluids and gases by opening and closing passageways. These valves are essential regulatory devices that maintain the balance of fluids in living beings as well as in macroscopic machines. Construction of such a device on the nanoscale level requires (i) controllable switching elements, more...



Powering a Supramolecular Machine with a Nanoscale Power Supply

Machines need power supplies to generate mechanical movement. Just as macroscopic machines require macroscopic energy sources, natural and artificial molecular machinery require nanoscale power supplies to effect precise molecular movement. While macroscopic machines do not move or work until energy is supplied to them for a specific function, more...



   

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