Switching surface chemistry with supramolecular machines.
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.
Bunker
Bruce C
BC
Sandia National Laboratories, Albuquerque, New Mexico 87185, USA. bcbunke@sandia.gov
Huber
Dale L
DL
Kushmerick
James G
JG
Dunbar
Timothy
T
Kelly
Michael
M
Matzke
Carolyn
C
Cao
Jianguo
J
Jeppesen
Jan O
JO
Perkins
Julie
J
Flood
Amar H
AH
Stoddart
J Fraser
JF
D004563:Electrochemistry; D004583:Electrons; D004988:Ethers, Cyclic / Q000737:chemistry*; D044085:Microfluidics; D010084:Oxidation-Reduction; D010269:Paraquat / Q000737:chemistry*
D004988:Ethers, Cyclic; D010269:Paraquat