Featured Research

from universities, journals, and other organizations

Molecular Solomon's Knot: Self-organization Leads To Intertwined Molecular Rings

Date:
December 15, 2006
Source:
John Wiley & Sons, Inc.
Summary:
A team of researchers from the University of California, Los Angeles (USA), and Nottingham Trent University (UK) led by J. Fraser Stoddart have used a self-organization process to get molecular building blocks to weave themselves into a Solomon-type knot, and describe their results in the journal Angewandte Chemie.

Mosaic image of King Solomon’s knot. UCLA chemists have made, at the nanoscale, molecular interlocked rings in the shape of the knot, a symbol of wisdom.
Credit: Courtesy of Joel Lipton, from the book “Seeing Solomon's Knot,” by Lois Rose Rose

It has been a beloved symbol for centuries, prized as an ornament found in engravings and embroidery, mosaics, and tattoos—and now as a molecule: Solomon’s knot, a motif consisting of two doubly intertwined rings.

Related Articles


A team of researchers from the University of California, Los Angeles (USA), and Nottingham Trent University (UK) have now used a self-organization process to get molecular building blocks to weave themselves into a Solomon-type knot. “The secret of our success is the careful selection of metal ions and solvents,” revealed J. Fraser Stoddart in the journal Angewandte Chemie. “Although various molecular species compete with each other in solution, the Solomon’s knot wins out during the crystallization process simply because it crystallizes better.”

Systems consisting of individual molecular components that are not chemically bound to each other, but rather are tied together through purely mechanical means, are an enormous challenge for scientists. Stoddart, one of the pioneers in the area of supramolecular chemistry, has successfully produced a whole series of such structures.

For example, he and his team have produced a system of molecules in the form of Borromean rings, whose name is derived from an Italian family that used such interlocked rings in their crest. Stoddart’s Borromean rings are formed from an 18-component self-assembly process in which six organic pieces with two “teeth” and another six with three “teeth” grip six zinc ions, producing the mutually interlocked three ring system. Things get particularly interesting when zinc and copper ions are mixed in a 1:1 ratio: a 12-component self-assembly process ensues to interlock two rings twice over instead of three, resulting in the formation of a molecular Solomon knot, isolated upon crystallization. The four loops of the knot are stabilized by two copper and two zinc ions. In solution, there is initially an equilibrium between the different types of knots. During crystallization, the Solomon’s knot form is preferred over the Borromean rings.

“In the making of these exotic compounds, chemical bonds are being broken just as fast as they are being formed until the compound that feels the most comfortable emerges as the final product,” explains Stoddart.


Story Source:

The above story is based on materials provided by John Wiley & Sons, Inc.. Note: Materials may be edited for content and length.


Cite This Page:

John Wiley & Sons, Inc.. "Molecular Solomon's Knot: Self-organization Leads To Intertwined Molecular Rings." ScienceDaily. ScienceDaily, 15 December 2006. <www.sciencedaily.com/releases/2006/12/061215122349.htm>.
John Wiley & Sons, Inc.. (2006, December 15). Molecular Solomon's Knot: Self-organization Leads To Intertwined Molecular Rings. ScienceDaily. Retrieved March 26, 2015 from www.sciencedaily.com/releases/2006/12/061215122349.htm
John Wiley & Sons, Inc.. "Molecular Solomon's Knot: Self-organization Leads To Intertwined Molecular Rings." ScienceDaily. www.sciencedaily.com/releases/2006/12/061215122349.htm (accessed March 26, 2015).

Share This


More From ScienceDaily



More Matter & Energy News

Thursday, March 26, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Amazon Complains U.S. Is Too Slow To Regulate Drones

Amazon Complains U.S. Is Too Slow To Regulate Drones

Newsy (Mar. 25, 2015) — Days after getting approval to test certain commercial drones, Amazon says the Federal Aviation Administration is dragging its feet on the matter. Video provided by Newsy
Powered by NewsLook.com
Smartphone Use Changing Our Brain and Thumb Interaction, Say Researchers

Smartphone Use Changing Our Brain and Thumb Interaction, Say Researchers

Reuters - Innovations Video Online (Mar. 25, 2015) — European researchers say our smartphone use offers scientists an ideal testing ground for human brain plasticity. Dr Ako Ghosh&apos;s team discovered that the brains and thumbs of smartphone users interact differently from those who use old-fashioned handsets. Jim Drury went to meet him. Video provided by Reuters
Powered by NewsLook.com
China Wants to Export Its Steel Problem

China Wants to Export Its Steel Problem

Reuters - Business Video Online (Mar. 25, 2015) — China is facing a crisis with a glut of steel and growing public anger over the pollution created by production. In a move to solve the problem, some steel mills are looking to relocate overseas. Jane Lanhee Lee reports. Video provided by Reuters
Powered by NewsLook.com
Robot Stays on Its Feet Despite Punishment

Robot Stays on Its Feet Despite Punishment

Reuters - Innovations Video Online (Mar. 24, 2015) — Robotic engineers have modelled a two-legged robot to be fast and agile like an ostrich. The design is more efficient and stable than bipedal robots built to move like humans, according to its creators who abuse the poor machine to test its skills. Ben Gruber has more. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Space & Time

Matter & Energy

Computers & Math

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins