Chapter 16. A New Conformational Polymorph of Solid Tetramesityldisilene Mes2Si[DOUBLE BOND]SiMes2, found by Raman, UV-Vis and Fluorescence Spectroscopy

  1. Prof. Norbert Auner3 and
  2. Prof. Johann Weis4
  1. Larissa A. Leites1,
  2. Sergey S. Bukalov1,
  3. Robert West2,
  4. John E. Mangette2 and
  5. Thomas A. Schmedake2

Published Online: 28 APR 2008

DOI: 10.1002/9783527619917.ch16

Organosilicon Chemistry IV: From Molecules to Materials

Organosilicon Chemistry IV: From Molecules to Materials

How to Cite

Leites, L. A., Bukalov, S. S., West, R., Mangette, J. E. and Schmedake, T. A. (2000) A New Conformational Polymorph of Solid Tetramesityldisilene Mes2Si[DOUBLE BOND]SiMes2, found by Raman, UV-Vis and Fluorescence Spectroscopy, in Organosilicon Chemistry IV: From Molecules to Materials (eds N. Auner and J. Weis), Wiley-VCH Verlag GmbH, Weinheim, Germany. doi: 10.1002/9783527619917.ch16

Editor Information

  1. 3

    Inst. für Anorganische Chemie, der Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt am Main, Germany, Phone: 0 69/7 98-29180, -29591, Fax: 069/798-29188

  2. 4

    Wacker-Chemie GmbH, Geschäftsbereich S, Werk Burghausen, Johannes-Hess-Strasse 24, D-84489 Burghausen, Germany

Author Information

  1. 1

    Institute of Organoelement Compounds Scientific and Technical Center on Raman Spectroscopy, Russian Academy of Sciences, Vavilova ul. 28, Moscow, 117813 Russia Fa: Int. code + (095)1355085

  2. 2

    Department of Chemistry, University of Wisconsin Madison, WI 53706, USA

Publication History

  1. Published Online: 28 APR 2008
  2. Published Print: 17 JAN 2000

ISBN Information

Print ISBN: 9783527298549

Online ISBN: 9783527619917

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Keywords:

  • disilene;
  • conformational polymorphism;
  • raman;
  • UV-vis

Summary

Three modifications of tetramesityldisilene (1) reported to date (orange unsolvated la and two yellow 1:l solvates with toluene lb and THF lc) have been found to readily transform to a new modification, yellow unsolvated Id. According to the spectral data, the new form Id is also a disilene but differs from la-c in both crystal and molecular structure. Id appears to be the most stable conformational polymorph of 1 but can be converted to the orange la upon illumination in the region 514–457 nm. A quasi-trans conformation with two aromatic rings nearly orthogonal and the other two nearly coplanar to the double-bond plane is tentatively proposed for 1d.