Crystallization and X-ray structures of [NaYb(C5H5)3] and Yb(C5H5)2

Abstract

The complex [NaYb(C 5 H 5 ) 3 ] (C 5 H 5 = cyclopentadienyl), prepared from Yb(C 5 H 5 ) 3 and sodium naphthalenide in tetrahydrofuran (thf) or from Yb(C 5 H 5 ) 2 and Na(C 5 H 5 ) in tetrahydrofuran and crystallized at ca. 400 °C (<10 - 4 mm Hg), is a three-dimensional polymer in which µ-η 5 :η 5 -C 5 H 5 groups link sodium and ytterbium (each metal having a pseudo-triangular arrangement of C 5 H 5 ligands); Yb(C 5 H 5 ) 2 , similarly crystallized, has a polymeric chain structure with one terminal and two bridging C 5 H 5 ligands per ytterbium, and there is η 1 -bonding between adjacent chains.