Issue 39, 2010

Novel neutral hexacoordinate silicon(iv) complexes with two bidentate monoanionic benzamidinato ligands

Abstract

The novel neutral hexacoordinate bis(benzamidinato)silicon(IV) complexes 1–10 (SiN4X2 skeletons; X = F, Cl, Br, C, N, S, Se) were synthesised and characterised by elemental analyses, single-crystal X-ray diffraction (except for 2) and NMR spectroscopy in the solid state and in solution. The dynamic behavior of 1 (SiN4Cl2 skeleton) and 3 (SiN4F2) was additionally studied by variable-temperature NMR experiments. Compounds 1 and 2 (SiN4Br2) were obtained by reaction of SiCl4 and SiBr4, respectively, with two molar equivalents of the corresponding lithium amidinate. Compound 1 served as the starting material in the syntheses of 3–10, in which the two chloro ligands of 1 were substituted by two (pseudo)halogeno or one bidentate dianionic S,S, S,Se or Se,Se ligand. Compound 4 contains an SiN4C2 skeleton and 5–7 contain an SiN6 skeleton. With the preparation of 8 (SiN4S2 skeleton), 9 (SiN4SSe) and 10 (SiN4Se2) it could be demonstrated that syntheses of hexacoordinate silicon(IV) complexes with soft chalcogeno ligand atoms are indeed feasible. Compounds 9 and 10 are the first hexacoordinate silicon(IV) complexes with Si–Se bonds.

Graphical abstract: Novel neutral hexacoordinate silicon(iv) complexes with two bidentate monoanionic benzamidinato ligands

Supplementary files

Article information

Article type
Paper
Submitted
29 Apr 2010
Accepted
23 Jun 2010
First published
01 Sep 2010

Dalton Trans., 2010,39, 9401-9413

Novel neutral hexacoordinate silicon(IV) complexes with two bidentate monoanionic benzamidinato ligands

K. Junold, C. Burschka, R. Bertermann and R. Tacke, Dalton Trans., 2010, 39, 9401 DOI: 10.1039/C0DT00391C

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