Unusual molecular structures of some sterically hindered lithium amides: electron diffraction results on gaseous [Li{N(SiMe3)2}]2 and X-ray data on crystalline monomeric Li(NHAr)(tmeda)(Ar = C6H2But 3-2,4,6; tmeda = Me2NCH2CH2NMe2)
- 1 January 1984
- journal article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Chemical Communications
- No. 13,p. 822-824
- https://doi.org/10.1039/c39840000822
Abstract
Gaseous bis(trimethylsilyl)amidolithium at ca. 403 K is a cyclic [graphic omitted] dimer of D2 symmetry, with Li–N 1.99(3)Å and ∠NLiN 100(3)° assuming the bridging (SiMe3)2 ligands to be orthogonal to the LiNLiN plane; crystalline 2,4,6-tri-t-butylanilido(N,N,N′,N′-tetramethylethylethylenediamine)lithium is a monomer at ambient temperature with lithium in a trigonal planer environment, Li–NHAr 1.895(8), average Li–NMe2 2.15(1)Å, ∠LiNCAr 155.6(4)°, and a rather short Li H(N) distance of 2.08(4)Å.Keywords
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