title: Switching surface chemistry with supramolecular machines.
abstract: Tethered supramolecular machines represent a new class of active self-assembled monolayers in which molecular configurations can be reversibly programmed using electrochemical stimuli. We are using these machines to address the chemistry of substrate surfaces for integrated microfluidic systems. Interactions between the tethered tetracationic cyclophane host cyclobis(paraquat-p-phenylene) and dissolved pi-electron-rich guest molecules, such as tetrathiafulvalene, have been reversibly switched by oxidative electrochemistry. The results demonstrate that surface-bound supramolecular machines can be programmed to adsorb or release appropriately designed solution species for manipulating surface chemistry.
authors.affiliation: Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. bcbunke@sandia.gov
authors.forename: Bruce C
authors.initials: BC
authors.lastname: Bunker
authors.forename: Dale L
authors.initials: DL
authors.lastname: Huber
authors.forename: James G
authors.initials: JG
authors.lastname: Kushmerick
authors.forename: Timothy
authors.initials: T
authors.lastname: Dunbar
authors.forename: Michael
authors.initials: M
authors.lastname: Kelly
authors.forename: Carolyn
authors.initials: C
authors.lastname: Matzke
authors.forename: Jianguo
authors.initials: J
authors.lastname: Cao
authors.forename: Jan O
authors.initials: JO
authors.lastname: Jeppesen
authors.forename: Julie
authors.initials: J
authors.lastname: Perkins
authors.forename: Amar H
authors.initials: AH
authors.lastname: Flood
authors.forename: J Fraser
authors.initials: JF
authors.lastname: Stoddart
mesh_terms: D004563:Electrochemistry; D004583:Electrons; D004988:Ethers, Cyclic / Q000737:chemistry*; D044085:Microfluidics; D010084:Oxidation-Reduction; D010269:Paraquat / Q000737:chemistry*
chemical_list: D004988:Ethers, Cyclic; D010269:Paraquat