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July 21, 2010

Liverpool scientists self assemble molecular 2 nanometer `knots'

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Scientists at the University of Liverpool have constructed molecular knots with dimensions of around two nanometers

Most molecules are held together by chemical bonds between atoms – ‘nano-knots’ are instead mechanically bonded by interpenetrating loops. Liverpool scientists have managed to create nanoscale knots in the laboratory by mixing together two simple starting materials – one a rigid aromatic compound and the other a more flexible amine linker.

This is an unusual example of ‘self-assembly’, a process which underpins biology and allows complex structures to assemble from more simple building blocks. Each knot is ‘tied’ three times: that is, at least three chemical bonds must be broken to untie the knot. A single knot is a complex assembly of 20 smaller molecules



Professor Andrew Cooper, Director of the University’s Centre for Materials Discovery, said: “I was amazed when we discovered these molecules; we actually set out to make something simpler. A complex structure arises out of quite basic building blocks.

“It is like shaking Scrabble tiles in a bag and pulling out a fully formed sentence. These are the surprises which make scientific research so fascinating.”


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