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NMR Characterization of Hybrid Systems Based on Functionalized Silsesquioxanes

Published online by Cambridge University Press:  10 February 2011

C. Bonhomme ,
F. Babonneau ,
J. Maquet ,
C. Zhang ,
R. Baranwal  and
R. M. laine
C. Bonhomme
Affiliation:
Université Pierre et Marie Curie / CNRS, Chimie de la Matière Condensée, Paris, France.
F. Babonneau
Affiliation:
Université Pierre et Marie Curie / CNRS, Chimie de la Matière Condensée, Paris, France.
J. Maquet
Affiliation:
Université Pierre et Marie Curie / CNRS, Chimie de la Matière Condensée, Paris, France.
C. Zhang
Affiliation:
University of Michigan, Departments of Chemistry and Material Science and Engineering, Ann Arbor, MI, USA.
R. Baranwal
Affiliation:
University of Michigan, Departments of Chemistry and Material Science and Engineering, Ann Arbor, MI, USA.
R. M. laine
Affiliation:
University of Michigan, Departments of Chemistry and Material Science and Engineering, Ann Arbor, MI, USA.
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Abstract

In this paper, we present recent NMR investigations on several silsesquioxanes (RSiO1.5)8 with R = H, CH3, CH=CH2, OSi(CH 3)2R′ (R′ = H, CH3, CH=CH2). The octameric polyhedral “cubane like” derivatives were analyzed by means of high resolution 13C and 29Si 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 ID IRCP sequence (Inversion Recovery Cross Polarization), based on the standard CP scheme, allowed us 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).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 437
Copyright
Copyright © Materials Research Society 1996

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