The effect of the C-methyl substitution on the molecular geometry of the silatrane skeleton: The crystal structures of 1-(4′-tolyl)-silatrane and 1-(4′-tolyl)-3,7,10-trimethylsilatrane

L. Párkányi, P. Hencsei, L. Bihátsi, I. Kovács, Á Szöllosy

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Abstract

Unsubstituted (1) and 3,7,10-trimethyl substituted (2) 1-(4′-tolyl)-silatranes were synthesized. 1H, 13C, 15N and 29Si NMR spectra were recorded and assigned. The conformation of the 2 stereoisomers in solution were characterized by the NMR spectra. 1 is monoclinic, P21/c, with a = 13.454(2), b = 13.888(2), c = 14.345(2) Å, β = 99.10(2)°. The major stereoisomer fraction of 2 is orthorhombic, Pbca, with a = 12.168(2), b = 13.754(4), c = 20.260(3) Å. The structures were solved by direct methods and were refined by least squares to R values of 0.039 and 0.066 for 3523 and 2158 reflexions. The N→Si distances are 1: 2.169(2) (mean) and 2: 2.236(3) Å. The solid state conformation of the 2 major stereoisomer fraction is different from that in solution and this is the first example of a silatrane crystal structure where the silatrane moiety lacks C3 symmetry.

Original languageEnglish
Pages (from-to)243-249
Number of pages7
JournalPolyhedron
Volume4
Issue number2
DOIs
Publication statusPublished - 1985

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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