Impact of heterocirculene molecular symmetry upon two-dimensional crystallization.

Abstract:

:Despite the development of crystal engineering, it remains a great challenge to predict the crystal structure even for the simplest molecules, and a clear link between molecular and crystal symmetry is missing in general. Here we demonstrate that the two-dimensional (2D) crystallization of heterocirculenes on a Au(111) surface is greatly affected by the molecular symmetry. By means of ultrahigh vacuum scanning tunneling microscopy, we observe a variety of 2D crystalline structures in the coverage range from submonolayer to monolayer for D(8h)-symmetric sulflower (C16S8), whereas D(4h)-symmetric selenosulflower (C16S4Se4) forms square and rectangular lattices at submonolayer and monolayer coverages, respectively. No long-range ordered structure is observed for C(1h)-symmetric selenosulflower (C16S5Se3) self-assembling at submonolayer coverage. Such different self-assembly behaviors for the heterocirculenes with reduced molecular symmetries derive from the tendency toward close packing and the molecular symmetry retention in 2D crystallization due to van der Waals interactions.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Xiao WD,Zhang YY,Tao L,Aït-Mansour K,Chernichenko KY,Nenajdenko VG,Ruffieux P,Du SX,Gao HJ,Fasel R

doi

10.1038/srep05415

subject

Has Abstract

pub_date

2014-06-24 00:00:00

pages

5415

issn

2045-2322

pii

srep05415

journal_volume

4

pub_type

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