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SUMMARY:Stable Silicon Clusters with Partial Substitution – Exploring th
 e SI6R6 Potential Energy Surface Experimentally - Dr David Scheschkewitz\,
  Imperial College London
DTSTART:20110203T140000Z
DTEND:20110203T150000Z
UID:TALK26170@talks.cam.ac.uk
CONTACT:Sian Bunnage
DESCRIPTION:The understanding of fundamental processes concerning the depo
 sition and functionalisation of films and surfaces of elemental silicon ca
 n benefit from preparative molecular chemistry. For instance\, the Si=Si b
 ond of stable disilenes is a suitable molecular model for the most promine
 nt characteristic of the reconstructed Si(001) 2x1 surface\, the so-called
  ‘buckled dimer’.1 This dimer and also single unsubstituted silicon at
 oms on the surface are pivotal to the expansion of silicon structures. In 
 addition\, nucleation in chemical vapour deposition techniques is known to
  proceed via unsaturated species such as disilenes\, small rings\, and (pa
 rtially) substituted silicon clusters.2 \nThe lecture is going to discuss 
 the experimental exploration of the Si6R6 manifold starting from small hom
 o- and heterocyclic silanes.3 The Si6R6 potential energy surface is of par
 ticular theoretical interest due to its relationship to the widely studied
  case of benzene (C6H6) in carbon chemistry. However\, as will be shown on
  selected examples the stability of the respective isomers is quite differ
 ent on the silicon side. Along the way surprises concerning the reactivity
  of Si6R6 isomers will be unveiled and a new type of aromaticity defined.4
 \n_________________________________\n1	Review: J. Yoshinobu\, Prog. Surf. 
 Sci. 2004\, 77\, 37.\n2	(a) E. W. Draeger\, J. C. Grossmann\, A. J. Willia
 mson\, G. Galli\, J. Chem. Phys. 120\, 10807 (2004)\; (b) D. K. Yu\, R. Q.
  Zhang\, S. T. Lee\, J. Appl. Phys. 92\, 7453 (2002).\n3	Review: K. Abersf
 elder\, D. Scheschkewitz\, Pure Appl. Chem. 2010\, DOI: 10.1351/PAC-CON-09
 -08-09.\n4	K. Abersfelder\, Andrew J. P. White\, Henry S. Rzepa\, D. Sches
 chkewitz\, Science 2010\, 327\, 564.\n
LOCATION:Unilever Lecture Theatre\, Department of Chemistry
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