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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Competition between Hexagonal and Tetragonal Hexabromobenzene Packing on Au(111).

Han Huang1,2, Zhiyu Tan, Yanwei He

  • 1Department of Physics, National University of Singapore , 2 Science Drive 3, Singapore 117542, Singapore.

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|February 25, 2016
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Summary

Hexabromobenzene (HBB) molecules form distinct hexagonal or tetragonal structures on gold surfaces, controlled by substrate temperature. This molecular packing is driven by intermolecular forces and molecule-substrate interactions, crucial for materials science.

Keywords:
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Area of Science:

  • Surface Science
  • Materials Chemistry
  • Physical Chemistry

Background:

  • Controlling molecular arrangement on surfaces is key for designing functional materials.
  • Hexabromobenzene (HBB) is a molecule of interest for its potential in organic electronics.
  • Understanding molecule-substrate interactions is crucial for predicting self-assembly behavior.

Purpose of the Study:

  • To investigate the structural arrangements of hexabromobenzene (HBB) on Au(111) surfaces.
  • To elucidate the underlying mechanisms governing HBB molecular packing.
  • To explore the role of temperature and intermolecular/substrate interactions in determining molecular structures.

Main Methods:

  • Low-temperature scanning tunneling microscopy (STM) was used to observe molecular structures.
  • Density functional theory (DFT) calculations were employed to investigate interaction mechanisms.
  • Analysis of molecule-substrate bonding and intermolecular forces was performed.

Main Results:

  • HBB molecules form hexagonally closely packed (hcp) or tetragonal structures on Au(111) depending on substrate temperature around 300 K.
  • Substrate-mediated C-Br···Br-C attractions promote hcp islands, preserving the Au(111) reconstruction.
  • At higher temperatures, HBB traps gold adatoms, forming tetragonal islands and altering the Au(111) reconstruction.

Conclusions:

  • The competition between intermolecular and molecule-substrate interactions dictates HBB packing at the subnanometer scale.
  • Site-specific molecule-substrate interactions influence the adsorption geometry.
  • Findings provide insights for crystal engineering, functional materials, and organic electronics.