Vol 4: Impact of heterocirculene molecular symmetry upon two-dimensional crystallization.Report as inadecuate



 Vol 4: Impact of heterocirculene molecular symmetry upon two-dimensional crystallization.


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This article is from Scientific Reports, volume 4.AbstractDespite 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 Au111 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 D8h-symmetric sulflower C16S8, whereas D4h-symmetric selenosulflower C16S4Se4 forms square and rectangular lattices at submonolayer and monolayer coverages, respectively. No long-range ordered structure is observed for C1h-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.



Author: Xiao, W. D.; Zhang, Y. Y.; Tao, L.; Ait-Mansour, K.; Chernichenko, K. Y.; Nenajdenko, V. G.; Ruffieux, P.; Du, S. X.; Gao, H.-J.; Fasel, R.

Source: https://archive.org/



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