Design and characterization of amino and chloro functionalized rhombohedral silsesquioxanes

Gultek A., Seckin T., Adiguzel H. İ.

TURKISH JOURNAL OF CHEMISTRY, vol.29, no.4, pp.391-399, 2005 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 29 Issue: 4
  • Publication Date: 2005
  • Journal Indexes: Science Citation Index Expanded, Scopus, TR DİZİN (ULAKBİM)
  • Page Numbers: pp.391-399


A more rapid and a versatile synthetic approach for the preparation of polyhedral silsesquioxanes (POSS) by hydrolytic condensation of organosilicon monomers in the presence of a Pt catalyst was studied. The structural properties of POSS molecules were determined by X-ray powder diffraction analysis, yielding a rhombohedral unit cell with a = 11,52796 angstrom and alpha = 94,9754 angstrom for octaaminopropyl-POSS, and a rhombohedral unit cell with a = 11,51421 angstrom, alpha = 96,7214 degrees for octachloropropyl-POSS. The activation energies were found to be 64.8, and 89.1 kJ/mol for octaaminopropyl-POSS and octachloropropyl-POSS, respectively. The products were also characterized by Fourier transform infrared spectroscopy, H-1 and C-13 nuclear magnetic resonance, differential thermal analysis, and thermogravimetric analysis.