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Chemists develop single molecule sieves to separate complex molecular mixtures

Date:
February 17, 2013
Source:
University of Liverpool
Summary:
Chemists have created a new technique that could be used in industry to separate complex organic chemical mixtures.

Professor Cooper: “The holes in these cage molecules act like a shape-selective molecular sieve, rather like a children’s wooden shape puzzle.”
Credit: Image courtesy of University of Liverpool

Chemists at the University of Liverpool have created a new technique that could be used in industry to separate complex organic chemical mixtures.

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.


Story Source:

The above story is based on materials provided by University of Liverpool. Note: Materials may be edited for content and length.


Journal Reference:

  1. Tamoghna Mitra, Kim E. Jelfs, Marc Schmidtmann, Adham Ahmed, Samantha Y. Chong, Dave J. Adams, Andrew I. Cooper. Molecular shape sorting using molecular organic cages. Nature Chemistry, 2013; DOI: 10.1038/nchem.1550

Cite This Page:

University of Liverpool. "Chemists develop single molecule sieves to separate complex molecular mixtures." ScienceDaily. ScienceDaily, 17 February 2013. <www.sciencedaily.com/releases/2013/02/130217084906.htm>.
University of Liverpool. (2013, February 17). Chemists develop single molecule sieves to separate complex molecular mixtures. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2013/02/130217084906.htm
University of Liverpool. "Chemists develop single molecule sieves to separate complex molecular mixtures." ScienceDaily. www.sciencedaily.com/releases/2013/02/130217084906.htm (accessed July 31, 2014).

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