Controlling the Supramolecular Assembly of Redox-Active Dendrimers at Molecular Printboards by Scanning Electrochemical Microscopy

Share/Save/Bookmark

Nijhuis, Christian A. and Sinha, Jatin K. and Wittstock, Gunther and Huskens, Jurriaan and Ravoo, Bart Jan and Reinhoudt, David N. (2006) Controlling the Supramolecular Assembly of Redox-Active Dendrimers at Molecular Printboards by Scanning Electrochemical Microscopy. Langmuir, 22 (23). pp. 9770-9775. ISSN 0743-7463

[img]PDF
Restricted to UT campus only
: Request a copy
385Kb
Abstract:Redox-active ferrocenyl (Fc)-functionalized poly(propylenimine) (PPI) dendrimers solubilized in aqueous media by complexation of the Fc end groups with β-cyclodextrin (βCD) were immobilized at monolayers of βCD on glass (“molecular printboards”) via multiple host−guest interactions. The directed immobilization of the third-generation dendrimer−βCD assembly G3-PPI−(Fc)16−(βCD)16 at the printboard was achieved by supramolecular microcontact printing. The redox activity of the patterned dendrimers was mapped by scanning electrochemical microscopy (SECM) in the positive feedback mode using [IrCl6]3- as a mediator. Local oxidation of the Fc−dendrimers by the microelectrode-generated [IrCl6]2- resulted in an effective removal of the Fc−dendrimers from the host surface since the oxidation of Fc to the oxidized form (Fc+) leads to a concomitant loss of affinity for βCD. Thus, SECM provided a way not only to image the surface, but also to control the binding of the Fc-terminated dendrimers at the molecular printboard. Additionally, the electrochemical desorption process could be monitored in time as the dendrimer patterns were gradually erased upon multiple scans
Item Type:Article
Copyright:© 2006 American Chemical Society
Faculty:
Science and Technology (TNW)
Research Group:
Link to this item:http://purl.utwente.nl/publications/59311
Official URL:http://dx.doi.org/10.1021/la0615894
Export this item as:BibTeX
EndNote
HTML Citation
Reference Manager

 

Repository Staff Only: item control page

Metis ID: 236552