Simple and complex lattices of N-alkyl fatty acid amides on a highly oriented pyrolytic graphite surface.
STM investigations of three N-alkyl fatty acid amide molecules have been carried out to get information of their molecular arrangement on a highly oriented pyrolytic graphite surface. With variable positions of amide along the alkyl chain, complex lattices with different lattice constants were observed. Besides the lattices with a repeat unit matching one or two molecular lengths, a lattice with a repeat unit corresponding to three molecular lengths was found. In addition, the portion of different lattices depends on the length of the shorter alkyl chain. DFT-D calculations point to interactions of antiparallel oriented dipoles due to the amide group, which are distance dependent and thus larger for shorter N-alkyl chains.
Zou
Bo
B
Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, D-48149, Münster, Germany.
Dreger
Katharina
K
Mück-Lichtenfeld
Christian
C
Grimme
Stefan
S
Schäfer
Hans J
HJ
Fuchs
Harald
H
Chi
Lifeng
L