Chemistry

Reactive Nanoassembly

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Science  10 Jun 2005:
Vol. 308, Issue 5728, pp. 1519
DOI: 10.1126/science.308.5728.1519c

One route toward creating nanostructures is first to self-assemble molecules through multiple weak interactions and then to cross-link pendant groups to create stable covalently bonded structures. Jin et al. report on a case where the components fail to assemble into larger structures until cross-linking reactions are initiated. Previously this group had shown that large aromatic groups (hexabenzocoronenes) bearing alkyl and triethylene glycol groups could form graphitic nanotubes that were held together by non-covalent interactions. However, when these molecules were derivatized to add reactive propenyl groups onto the glycol chains, no assembly into nanotubes occurred during solvent evaporation. However, when a Ru acyclic diene metathesis catalyst was added to the CH2Cl2 solution, ethylene was released and nanosheets formed. — PDS

J Am. Chem. Soc. 10.1021/ja051859p (2005).

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