Bi- and tridentate silicon-based acceptor molecules

作者：Horstmann Jan; Lamm Jan Hendrik; Strothmann Till; Neumann Beate; Stammler Hans Georg; Mitzel Norbert W^*

来源：Zeitschrift fur Naturforschung Section B-A Journal of Chemical Sciences, 2017, 72(6): 383-391.

DOI：10.1515/znb-2017-0031

• dispersion interactions
• poly-Lewis acids
• X-ray diffraction experiments

Triethynylphenylsilane (1), trivinylphenylsilane (2), diethynyldiphenylsilane (3) and diphenyldivinylsilane (4) were reacted with chlorodimethylsilane yielding the corresponding hydrosilylation products. To increase their Lewis acidity, the Si-Cl functions were directly transferred into Si-C6F5 units by salt elimination reactions leading to the (semi-) flexible molecules 5-8 bearing two or three Lewis-acidic sidearms. With the aim of providing host-guest complexes, the air-stable and readily soluble compounds 5-8 were converted with N- and O-Lewis bases of different size and geometry. In all cases, NMR spectroscopic investigations reveal no formation of Lewis acid-base complexes. X-ray diffraction experiments of host compounds 5-7 show intermolecular aryl...perfluoroaryl interactions of dispersion nature in the solid state. By hydrosilylation of 1 with trichlorosilane the more Lewis-acidic all-trans-tris[(trichlorosilyl) vinyl] phenylsilane (9) was obtained. Its Lewis acidity was further increased by fluorination to yield all-trans-tris[(trifluorosilyl) vinyl] phenylsilane (10); the conversion with nitrogen containing Lewis bases ends up in the formation of insoluble precipitates.

• 出版日期2017-6