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Trisilylamines, a 13 C, 15 N and 29 Si NMR study in solution—evidence for Si—Br—Si bridging
Author(s) -
Wrackmeyer Bernd,
Kehr Gerald,
Wettinger Dagmar
Publication year - 1998
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199806)36:13<s157::aid-omr270>3.0.co;2-4
Subject(s) - chemistry , chemical shift , nitrogen atom , silicon , nuclear magnetic resonance spectroscopy , bridging (networking) , crystallography , trigonal crystal system , atom (system on chip) , nitrogen , coupling constant , spectroscopy , stereochemistry , crystal structure , group (periodic table) , organic chemistry , computer network , physics , particle physics , computer science , quantum mechanics , embedded system
Trisilylamines (Me 3 Si) 3 N ( 1 ), [Me 2 (HCequiv;C)Si] 3 N ( 2 ), [Me 2 (HC≡C)Si] 2 NSiMe 2 Br ( 3 ), [Me 2 (Br)Si] 2 NSiMe 2 C≡CH ( 4 ) and [Me 2 (Br)Si] 3 N ( 5 ) were studied by 13 C, 15 N and 29 Si NMR spectroscopy. The trends in their chemical shifts, in particular of δ 15 N, coupling constants 1 J ( 29 Si, 13 C) and 1 J ( 29 Si, 15 N) and isotope‐induced chemical shifts 1 Δ 28/29 Si( 15 N) point towards a different bonding situation in 5 to that in 1 – 4 . It can be assumed that Si—Br—Si bridging in 5 leads to a fluxional structure in which the bromine atoms, and in turn a methyl group and the nitrogen atom, occupy pseudo‐axial positions in the distorted trigonal planar surroundings of the silicon atom. © 1998 John Wiley & Sons, Ltd.