Toward Mechanical Switching of Surface-Adsorbed Catenane by in Situ Copper Complexation
2007 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 129, 15662-15667 p.Article in journal (Refereed) Published
Using scanning tunneling microscopy (STM), electrospray ionization mass spectrometry (ESI-MS), and X-ray photoelectron spectroscopy (XPS), we demonstrate that a free catenane consisting of two interlocking 30-membered rings (cat-30) can be deposited on a Ag(111) surface by vacuum sublimation without decomposition. The deposited cat-30 molecules self-organize as ordered dimer chain structures at the surface, presumably via intermolecular π−π stacking. An in situ addition of Cu atoms to the surface-adsorbed catenanes induces a drastic change in the molecular organization, i.e., from the dimer chain structure to isolated species. The nitrogen core level spectra suggest that the cat-30 phenanthroline units coordinate with Cu, indicating that the free catenane has been transformed into a Cu-complexed catenane. Since it is known that the two interlocked macrocyclic rings of the free ligand cat-30 completely rearrange, i.e., circumrotate, upon complexation to copper, our results reveal that when adsorbed on the silver surface, the two macrocyclic rings of the free catenane can glide within one another so as to generate the corresponding copper complex by in situ Cu complexation.
Place, publisher, year, edition, pages
Washington, DC, USA: American Chemical Society (ACS), 2007. Vol. 129, 15662-15667 p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-78523DOI: 10.1021/ja075886mOAI: oai:DiVA.org:liu-78523DiVA: diva2:533709