Benzyl Complexes of Lanthanide(II) and Lanthanide(III) Metals:
Trends and Comparisons
Sjoerd Hardera, Christian Ruspica, Nollaig N´ı Bhriainb, Frederic Berkermanna, and Markus Sch ¨urmannc
aUniversit¨at Duisburg-Essen, Universit¨atsstraße 5, 45117 Essen, Germany
bDow Benelux, Terneuzen, Netherlands
cTechnische Universit¨at Dortmund, Otto-Hahn-Straße 6, 44221 Dortmund, Germany Reprint requests to Prof. Dr. S. Harder. E-mail: sjoerd.harder@uni-due.de
Z. Naturforsch.2008,63b,267 – 274; received December 1, 2007
A variety of benzyllanthanide complexes have been prepared by the metathesis reaction of benzylpotassium precursors with lanthanide halides. Syntheses and crystal structures for the following complexes are described: [2-Me2N-α-Me3Si-benzyl]2Eu(II)·(THF)2 (1-Eu), (2-Me2N- benzyl)3Ln(III) (2-LnwithLn= Nd, Sm, Dy, Ho, Yb), (4-R-C6H4CH2)3Ln·(THF)3(3-Y:Ln= Y, R = H;3-La:Ln= La, R =tBu). Complexes of types1and2are thermally robust on account of a stabilization by a benzylic Me3Si substituent and/or intramolecular coordination of the Me2N sub- stituent. Comparison of the crystal structures of these new series of lanthanide complexes shows several similarities and trends. In addition, comparisons with alkali metal and alkaline earth metal benzyl complexes are made.
Key words:Benzyl Complexes, Lanthanide(II) Metal Complexes, Lanthanide(III) Metal Complexes, Crystal Structures
