Novel neutral hexacoordinate silicon complexes 1-6 were prepared and the mechanism of ligand exchange studied. Two simultaneous nondissociative N-methyl exchange processes were found. On the basis of persistence of 1JSi-Fand 2JN-Si-H in 5 and 1a, respectively, dissociative exchange was ruled out. The two consecutive processes were assigned (in order of increasing activation energy) to (X, Cl)- and (O, O)-1,2-shifts, based on the low-temperature NOESY and Saturation Transfer spectrum. The first observation of 15N1H coupling across the Si-N coordinative bond is reported.
|Title of host publication||Organosilicon Chemistry Set|
|Subtitle of host publication||From Molecules to Materials|
|Number of pages||11|
|State||Published - 1 Jan 2005|
- Hexacoordinate Silicon
- Multinuclear NMR