Mh. Chai et al., Preparation of carbosilane dendrimers and their characterization using H-1/C-13/Si-29 triple resonance 3D NMR methods, J AM CHEM S, 121(2), 1999, pp. 273-279
In this paper we show the utility of H-1/C-13/Si-29 triple resonance, 3D, a
nd pulse field gradient (PFG) NMR techniques for characterizing organosilic
on based polymers. The dendrimers studied are first generation Si(CH2CH2SiH
Me2)(4) and second generation Si[CH2CH2SiMe(CH2CH2SiHMe2)(2)](4) polycarbos
ilanes. The signals from one-bond and two-bond connectivities among H-1 ato
ms coupled to both C-13 and Si-29 at natural abundance have been selectivel
y detected. The spectral dispersion and the atomic connectivity information
present in the 3D NMR spectra provide resonance assignments and a definiti
ve structure proof.