Chemische Berichte p. 765 - 771 (1996)
Update date:2022-08-11
Topics:
Fleischer, Holger
Hensen, Karl
Stumpf, Thorsten
Bis(dichlorosilyl)amine reacts in chloroform solution with 2-picoline to give H3SiCl, H2SiCl2, and HSiCl3 whereas with 3-picoline the two hypervalent silicon compounds H2SiCl2-(3pic)2 and [H2Si(3pic)4]Cl2 ·4 CHCl3 containing hexacoordinated Si atoms are formed. These complexes are in a chemical equilibrium with each other in chloroform solution, from which crystals of [H2Si(3pic)4]Cl2 ·4 CHCl3 could be isolated. The crystal structure of the latter was determined by single-crystal X-ray diffraction. The complex can be regarded as an "contact ion trio" of [H2Si(3pic)4]2+ and two Cl- ions. The N→Si bond lengths, r(Si-N) = 196.9(3} and 197.5(3) pm, are similar to those found in neutral hexacoordinated Si complexes. The data obtained from a 1H1H ROESY experiment suggest that dissolution has no significant impact on the molecular structure of [H2Si(3pic)4]Cl2 ·4 CHCl3. VCH Verlagsgcsellschaft mbH, 1996.
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