ISSN:
1572-8854
Source:
Springer Online Journal Archives 1860-2000
Topics:
Geosciences
,
Physics
Notes:
Abstract {Li[OC6H3-2,6-(tBu)2]THF}2, synthesized from phenol and LiH, is shown by X-ray crystallography to exist in the solid as a centrosymmetric dimer with two bridging phenoxides. Terminal THF ligands (envelope conformation) complete trigonal planar coordination about Li. The THF ligand plane lies in the Li2(μ-O)2 plane, while the phenyl ligands are perpendicular to this same Li2O2 plane. This explains the unusual1H NMR chemical shifts of the THF ligand. THF binds to Li as a dipole rather than using one of the two ether lone pairs. Crystallographic data (−160°C):a=18.799(3) Å,b=18.758(6),c=15.697(5), andZ=4 in space groupPbca (no. 61). The final quality indices areR(F)=6.2% andR w (F)=5.9% for 1535 unique data.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01182140
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