Image Disulfane molecule

TLF ID R6846

This is a colour image of a model of a molecule of disulfane, H₂S₂. In this model, atoms are represented by coloured spheres held together by grey rods, representing covalent bonds. The disulfane molecule consists of two sulfur atoms (the yellow spheres) and two hydrogen atoms (the grey-white spheres).



Educational details

Educational value
  • Disulfane is a yellow liquid that does not occur naturally and is of interest mainly to chemists.
  • The atoms in the molecule are connected by single covalent bonds. A covalent bond is formed when atoms share electrons. A single covalent bond has two shared electrons, one contributed by each atom. Because sulfur atoms are able to contribute two electrons, they are able to participate in two covalent bonds, whereas each hydrogen atom has only one electron to share and so can form only one bond.
  • This molecule, H₂S₂, has a similar shape to the hydrogen peroxide molecule, H₂O₂, reflecting the fact that oxygen and sulfur belong to the same group of the periodic table. It is shown in its most stable shape, but the shape is not fixed because the single bond between the sulfur atoms allows the hydrogen atoms to rotate around that axis. The molecule can have temporary shapes varying roughly from a U to a Z.
  • The type of model shown here, called a ball-and-stick model, is one of several ways of modelling molecules. This type is useful because it clearly shows the geometry of the molecule and the order (single, double or triple) of the bonds. However, because 'sticks' are used to represent bonds, this type of model does not represent the actual shape of the molecule as well as 'space-filling' models do.

Other details

Contributors
  • Publisher
  • Date of contribution: 20 Sep 2013
  • Organisation: Education Services Australia
  • Address: Melbourne VIC 3000 Australia
  • URL: http://www.esa.edu.au/
  • Copyright holder
  • Organisation: Education Services Australia
  • Address: Melbourne VIC 3000 Australia
  • URL: http://www.esa.edu.au/
  • Remarks: Copyright Education Services Australia
  • Author
  • Date of contribution: 2006
  • Organisation: Education Services Australia
  • Address: Melbourne VIC 3000 Australia
  • URL: http://www.esa.edu.au/
  • Remarks: creator
  • Content provider
  • Organisation: Education Services Australia
  • Address: Melbourne VIC 3000 Australia
  • URL: http://www.esa.edu.au/
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  • © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.