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The single\u2010crystal X\u2010ray structures of these complexes show that the metal atoms are surrounded by seven ligands in a distorted pentagonal bipyramidal arrangement, in which the chlorine atoms are located in the apical positions. The diphosphanylamide ligand is always \u03b7<jats:sup>2<\/jats:sup>\u2010coordinated through the nitrogen atom and one phosphorus atom. Further reaction of [SmCl<jats:sub>2<\/jats:sub>{(Ph<jats:sub>2<\/jats:sub>P)<jats:sub>2<\/jats:sub>N}(thf)<jats:sub>3<\/jats:sub>] with K<jats:sub>2<\/jats:sub>C<jats:sub>8<\/jats:sub>H<jats:sub>8<\/jats:sub> or reaction of [LnI(\u03b7<jats:sup>8<\/jats:sup>\u2010C<jats:sub>8<\/jats:sub>H<jats:sub>8<\/jats:sub>)(thf)<jats:sub>3<\/jats:sub>] with [K(thf)<jats:sub><jats:italic>n<\/jats:italic><\/jats:sub>][N(PPh<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub>] in THF gives the corresponding cyclooctatetraene complexes [Ln{(Ph<jats:sub>2<\/jats:sub>P)<jats:sub>2<\/jats:sub>N}(\u03b7<jats:sup>8<\/jats:sup>\u2010C<jats:sub>8<\/jats:sub>H<jats:sub>8<\/jats:sub>)(thf)<jats:sub>2<\/jats:sub>] (Ln=La, Sm). The single crystals of these compounds contain enantiomerically pure complexes. Both compounds adopt a four\u2010legged piano\u2010stool conformation in the solid state. The structures of the <jats:italic>A<\/jats:italic> and the <jats:italic>C<\/jats:italic> enantiomers were established by single\u2010crystal X\u2010ray diffraction. The more soluble bistrimethylsilyl cyclooctatetraene complex [Y{(Ph<jats:sub>2<\/jats:sub>P)<jats:sub>2<\/jats:sub>N}(\u03b7<jats:sup>8<\/jats:sup>\u20101,4\u2010(Me<jats:sub>3<\/jats:sub>Si)<jats:sub>2<\/jats:sub>C<jats:sub>8<\/jats:sub>H<jats:sub>6<\/jats:sub>)(thf)<jats:sub>2<\/jats:sub>] was obtained by transmetallation of Li<jats:sub>2<\/jats:sub>[1,4\u2010(Me<jats:sub>3<\/jats:sub>Si)<jats:sub>2<\/jats:sub>C<jats:sub>8<\/jats:sub>H<jats:sub>6<\/jats:sub>] with anhydrous yttrium trichloride in THF followed by the addition of one equivalent of [K(thf)<jats:sub><jats:italic>n<\/jats:italic><\/jats:sub>][N(PPh<jats:sub>2<\/jats:sub>)<jats:sub>2<\/jats:sub>]. The <jats:sup>89<\/jats:sup>Y NMR signal of the complex is split up into a triplet, supporting other observations that the phosphorus atoms are chemically equivalent in solution and, thus, dynamic behavior of the ligand in solution can be anticipated.<\/jats:p>","DOI":"10.1002\/chem.200305745","type":"journal-article","created":{"date-parts":[[2004,5,27]],"date-time":"2004-05-27T11:03:49Z","timestamp":1085655829000},"page":"3537-3542","source":"Crossref","is-referenced-by-count":48,"title":["Yttrium and Lanthanide Diphosphanylamides: Syntheses and Structures of Complexes with one {(Ph<sub>2<\/sub>P)<sub>2<\/sub>N}<sup>\u2212<\/sup> ligand in the Coordination Sphere"],"prefix":"10.1002","volume":"10","author":[{"given":"Peter W.","family":"Roesky","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael 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