Synthesis and Structural Characterization of Neutral Hexacoordinate Silicon( IV ) Complexes with SiO2N4 Skeletons

Abstract Surrounded by six: A series of novel neutral hexacoordinate silicon(IV) complexes with SiO2N4 skeletons, containing two bidentate monoanionic O,N ligands and two monoanionic NCX (X = O, S) ligands, was synthesized. The formation of the title compounds involved some unexpected transformations of the bidentate O,N ligands. magnified image A series of novel neutral hexacoordinate silicon(IV) complexes with SiO2N4 skeletons (compounds 4–8) was synthesized and structurally characterized by single‐crystal X‐ray diffraction and solid‐state NMR spectroscopy (13C, 15N, 29Si). The silicon(IV) complexes each contain two bidentate monoanionic O,N Schiff base ligands and two cyanato‐N or thiocyanato‐N ligands. Compounds 4–8 were prepared from Si(NCO)4 or Si(NCS)4, whereby the complex formation involved some unexpected chemical transformations of the ligands.