SI-29 CP MAS NMR OF PHOSPHORUS-BEARING ORGANOSILICON COMPOUNDS/

While liquid-state Si-29 NMR of phosphorus-bearing organosilicon compo unds with more than one phosphorus per molecule can take advantage of the presence of J-coupling (n)J((PSi)-P-31-Si-29) for purposes of stru ctural assignment from J-coupling patterns, conventional Si-29 CP/MAS spectra of such molecular solids do not reveal structural details in a straightforward manner. For such compounds it is necessary to obtain Si-29 CP/MAS spectra under conditions of simultaneous H-1- and P-31-hi gh power decoupling in order to derive reliable Si-29 chemical shift i nformation. Si-29 CP/MAS NMR spectra, obtained with and without P-31 h igh power decoupling during the acquisition time, of several organosil icon compounds containing SixPy (x = 1-10, y = 1-10) moieties are repo rted. (C) 1997 Elsevier Science B.V.