CRYSTAL-STRUCTURE AND UNAMBIGUOUS ASSIGNMENT OF 2 LIGAND-EXCHANGE BARRIERS IN NEUTRAL PENTACOORDINATE SILICON COMPLEXES - CORRELATION OF SI-29 AND N-15 CHEMICAL-SHIFTS AND SI-N CLEAVAGE BARRIERS

The first assignment of both consecutive Ligand exchange processes, Si -N cleavage and pseudorotation, in a series of neutral pentacoordinate silicon complexes with a single halogen ligand (monofunctional silane s) is described. The first crystal structure for a N-Si chelate with a ClSiC2ON coordination center was determined. A remarkable linear corr elation was found between Si-N cleavage barriers and the corresponding coordinative Si-29 and N-15 chemical shifts.