Lanthanides: Aryl Compounds
Published Online: 17 DEC 2012
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Encyclopedia of Inorganic and Bioinorganic Chemistry
How to Cite
Cotton, S. A. 2012. Lanthanides: Aryl Compounds. Encyclopedia of Inorganic and Bioinorganic Chemistry. .
- Published Online: 17 DEC 2012
Simple phenyls are only known for scandium and the later lanthanides, obtained as solvates [Ln(C6H5)3(THF)3] (Ln = Ho, Er, Tm, Lu) and [La(C6H5)3(THF)2] (Ln = Lu, Sc), which have octahedral and trigonal bipyramidal structures, respectively. These appear to oligomerize on heating, thus the lanthanides do not form unsolvated molecular phenyls. The only unsolvated species are the anions [Li(THF)4] [Ln(2,6-dimethylphenyl)4] (Ln = Yb, Lu). Monophenyls such as [Gd(C6H5)Cl2(THF)4] can be made using a deficit of phenyl lithium in the synthesis, but with very bulky aryl groups 2,6-dimesitylphenyl (Dmp) and 2,6-di(1-naphthyl)phenyl (Dnp), steric effects prevent the introduction of more than one aryl in the compounds [Y(Dmp)Cl2(THF)3], [Ln(Dmp)Cl2(THF)2] (Ln = Sc, Yb), and [DnpLnCl2(THF)2] (Ln = Y, Tm, Yb), which have adopted five- and six-coordinate structures.