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Single molecule sieves separate complex molecular mixtures

By R&D Editors | February 15, 2013

A team of researchers at the University's Department of Chemistry, led by Professor Andrew Cooper, have created organic molecular crystals that are able to separate important organic aromatic molecules by their molecular shape.Chemical feedstocks containing benzene are used extensively in industry to create modern materials and polymers. Their use relies heavily on distillation techniques which separate complex mixtures into more simple molecules used as building blocks to develop drugs, plastics and new materials. These distillation techniques can be expensive and involve large amounts of energy for hard-to-separate mixtures.
   
A team of researchers at the University’s Department of Chemistry, led by Professor Andrew Cooper, have created organic molecular crystals that are able to separate important organic aromatic molecules by their molecular shape.
   
Professor Cooper said: “We were able to demonstrate this new molecule separation technique by synthesising porous organic cage molecules that are highly similar in shape to the molecules that need to be separated.
   
“The holes in these cage molecules act like a shape-selective molecular sieve, rather like a children’s wooden shape puzzle. Using computer simulations we revealed how the porous cages separate the aromatic feedstocks and show that, unlike a wooden shape puzzle, the mechanism actually involves flexibility and motion in the cage sieves. “
   
The ability to separate complex molecules using less energy will be important in the future for current petrochemical and chemical industries and for producing any next-generation sustainable bio-derived chemicals.

The findings are part of a five-year research program in new materials discovery, funded by the Engineering and Physical Sciences Research Council (EPSRC) and are published in Nature Chemistry.

Source: University of Liverpool

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