Synthesis of triple stranded porphyrin nanobelts.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41100603.
- Also identified by DOI 10.1126/science.adz8900.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
Molecular nanobelts are fascinating analogs of carbon nanotubes. Their rigid geometries and strongly coupled π-electrons have the potential to generate a wave function resembling that of a quantum ring. Here, we report the synthesis of triple stranded nanobelts consisting of 8 to 12 edge-fused porphyrin units with diameters of 21 to 32 angstroms. We synthesized these nanobelts by nickel-mediated coupling of <i>meso</i>-bromoporphyrins to form singly linked nanorings, followed by oxidation with gold(III) chloride. Experimental <sup>1</sup>H nuclear magnetic resonance spectra, supported by computational simulations, revealed that belts containing odd numbers of porphyrins, with circuits of 90 or 110 π-electrons, display global aromatic ring currents, whereas even-numbered belts, with 80, 100, or 120 π-electrons, are globally antiaromatic.