Abstract
Aminosilanes bearing bulky substituents on nitrogen centers, [(ArNH) 2SiPhMe] (Ar = 2,6- i Pr 2C 6H 3 ( 1), 2,4,6-Me 3C 6H 2 ( 2)) and half-sandwich lithium silylamide [(2,6-Et 2C 6H 3NLi)(2,6-Et 2C 6H 3NH)SiPh 2] ( 3) have been prepared and characterized by elemental analysis, IR, EI mass and NMR ( 1H and 29Si) spectroscopic studies. The solid state structures of 2 and 3 have been determined by single crystal X-ray diffraction studies. The molecule 2 has a C 1 symmetry due to the steric crowding, and the two N–H protons are approximately trans to each other. The amido nitrogen atoms in 2 show significant deviation from trigonal-planar geometry, and as a result, the observed Si–N bonds are marginally longer than those observed in aminosilanes with planar nitrogen atoms. The molecule 3 exists as discrete dimer with an inversion center. The Li ion in 3 forms intramolecular π-complex with the neighboring aryl (2,6-Et 2C 6H 3) group, to form a half-sandwich lithium silylamide.
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