Premium
NMR study of organosilicon compounds. III —Silicon‐29, nitrogen‐14, carbon‐13 and proton NMR spectra of silylakylamines
Author(s) -
Schraml J.,
Chvalovský V.,
Mägi M.,
Lippmaa E.
Publication year - 1975
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270070806
Subject(s) - chemical shift , organosilicon , substituent , intramolecular force , chemistry , silicon , nitrogen , nmr spectra database , spectral line , carbon fibers , carbon 13 nmr , atom (system on chip) , crystallography , nitrogen atom , proton , computational chemistry , stereochemistry , organic chemistry , ring (chemistry) , materials science , physics , quantum mechanics , astronomy , composite number , computer science , composite material , embedded system
29 Si, 14 N 13 C and 1 H NMR data are presented for a series of homologous (methylethoxysilyl)alkylamines of the type (CH 3 ) 3− n (C 2 H 5 O) n Si(CH 2 ) m NH 2 ( n =o to 3; m = 1 to 4). The measured 13 C and 1 H chemical shifts correlate with the total net charges Q A on the corressponding atoms, estimated by the Del Re method. 14 N and 29 Si chemical shifts which do not show simple linear relationships to the charges are found to correlate with the relative basicities of the compounds. The influence of the remote substituent (NH 2 and others) on the 29 Si chemical shifts is shown to depend on the number and nature of substituents directly on the silicon atom. Argyments for d‐orbital participation in the SiO bounds are given. The chemical shifts of 29 Si, 14 N and 13 C nuclei are not consistent with the fromation of intramolecular ‘long bonds’ between the solicon and nitrogen atoms in aliphatic silymethylamines.