Controlling the supramolecular assembly of redox active dendrimers at molecular printboards by scanning electrochemical microscopy

C.A. Nijhuis, Jatin K. Sinha, Gunther Wittstock, Jurriaan Huskens, B.J. Ravoo, David Reinhoudt

Research output: Contribution to journalArticleAcademicpeer-review

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
Original languageUndefined
Pages (from-to)9770-9776
Number of pages6
JournalLangmuir
Volume22
Issue number23
DOIs
Publication statusPublished - 2006

Keywords

  • METIS-236552
  • IR-59311

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