NMR characterization of hybrid systems based on functionalized silsesquioxanes
- Univ. Pierre et Marie Curie, Paris (France). Chimie de la Matiere Condensee
- Univ. of Michigan, Ann Arbor, MI (United States)
In this paper, the authors present recent NMR investigations on several silsesquioxanes (RSiO{sub 1.5}){sub 8} with R = H, CH{sub 3}, CH{double_bond}CH{sub 2}, OSi(CH{sub 3}){sub 2}R{prime} (R{prime} = H, CH{sub 3}, CH{double_bond}CH{sub 2}). The octameric polyhedral cubane like derivatives were analyzed by means of high resolution {sup 13}C and {sup 29}Si solid state NMR including CP (Cross-Polarization) and MAS (Magic Angle Spinning) techniques. The CP sequence including variable contact time was used in order to extract quantitative data. The 1D IRCP sequence (Inversion Recovery Cross Polarization), based on the standard CP scheme, allowed them to investigate the CP dynamics of the involved sites and to propose a complete spectral editing of the spectra. Furthermore, local molecular motions were determined through the careful analysis of CP dynamics. Finally, the NMR results related to crystalline cubane derivatives were extended to hybrid systems obtained by cross-coupling of monomeric entities (via hydrosilylation).
- OSTI ID:
- 427726
- Report Number(s):
- CONF-960401--; ISBN 1-55899-338-X
- Country of Publication:
- United States
- Language:
- English
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