Noncovalent Binding of Carbon Nanotubes by Porphyrin Oligomers


  • We thank the European Commission for funding through THREADMILL (MRTN-CT-2006-036040) and Dr. C. Salzmann for valuable discussion.


original image

Like the tentacles of an octopus: Porphyrin oligomers bind strongly to single-walled carbon nanotubes, and debundle multitube aggregates. The strength of this interaction increases sharply with the number of porphyrin units in the oligomer, and the affinity is greatest for chiral (7,5) and (8,6) tubes. Quantitative information on these noncovalent recognition processes was obtained from UV/Vis/NIR absorption (see picture) and fluorescence titrations.