ORGANOAMIDO-LANTHANOIDS AND ARYLOXO-LANTHANOIDS .1. THE PREPARATION AND CHARACTERIZATION OF SOME LANTHANOID(II) ORGANOAMIDES, AND THE X-RAY CRYSTAL-STRUCTURE OF CIS-BIS(CARBAZOL-9-YL)TETRAKIS(TETRAHYDROFURAN)EUROPIUM(II)

Reaction of carbazole (Hcbz) or 2-phenylindole (Hpin) with bis(pentafluorophenyl)-ytterbium or -europium in tetrahydrofuran (thf) gives the complexes M(cbz)2(thf)4 (M = Yb or Eu) or Yb(pin)2(thf)4. From treatment of lanthanoid metals with bis(pentafluorophenyl)mercury and 2-phenylindole, 2, 3, 4, 5-tetraphenylpyrrole (Htpp) or carbazole, the complexes M(pin)2(thf)4 (M = Yb, Eu or Sm), M(tpp)2(thf)3 (M = Yb or Sm) and Yb(cbz)2(thf)4 have been isolated. Desolvation of M(pin)2(thf)4 under vacuum yields Yb(pin)2(thf) and Sm(pin)2(thf)3. Oxidation of Sm(pin)2(thf)4 with Hg(C6F5)2 and 2-phenylindole gives Sm(pin)3(thf). The crystal structure of Eu(cbz)2(thf)4 shows the complex to be monomeric with distorted octahedral stereochemistry for europium, cis-carbazol-9-yl ligands (<Eu-N> 2·559 A), and longer Eu-O bonds (av. 2·600 A) trans to N than mutually trans (<Eu-O> 2·553 A). Other complexes M(NR2)2(thf)n (NR2 =pin, cbz or tpp) are considered to be monomeric with five (n = 3) or six (n = 4) coordination. © 1990 ASEG.