AVS 60th International Symposium and Exhibition
    Thin Film Wednesday Sessions
       Session TF+AS+BI+EM+SE+SS-WeA

Paper TF+AS+BI+EM+SE+SS-WeA10
Quasicrystalline Ordering in Small-Molecule Self-Assembly

Wednesday, October 30, 2013, 5:00 pm, Room 104 A

Session: Applications of Self-Assembled Monolayers and Nano-Structured Assemblies
Presenter: N.A. Wasio, University of Notre Dame
Authors: N.A. Wasio, University of Notre Dame
R.C. Quardokus, University of Notre Dame
R.P. Forrest, University of Notre Dame
C.S. Lent, University of Notre Dame
S.A. Corcelli, University of Notre Dame
J.A. Christie, University of Notre Dame
K.W. Henderson, University of Notre Dame
S.A. Kandel, University of Notre Dame
Correspondent: Click to Email
Scanning tunneling microscopy was used to study self-assembly of carboxylic acid monolayers. In most cases, the formation of two strong hydrogen bonds results in dimer formation; in some others, linear catemer chains are formed. We report the observation of a five-membered catemer ring, stabilized by additional CH···O interactions available in the cyclic structure. We confirm the existence of CH···O hydrogen bonding, both with density functional theory calculations and by observing the disappearance of pentamers when molecules without suitable CH donors are used. Long-range assembly of pentamers results in a two-dimensional quasicrystalline lattice, the first observation of such structure from small-molecule self-assembly.