title: Syntheses and structures of alkaline earth metal bis(diphenylamides).
abstract: Various preparative procedures are employed in order to synthesize alkaline earth metal bis(diphenylamides) such as (i) metalation of HNPh2 with the alkaline earth metal M, (ii) metalation of HNPh2 with MPh2, (iii) metathesis reaction of MI2 with KNPh2, (iv) metalation of HNPh2 with PhMI in THF, and (v) metathesis reaction of PhMI with KNPh2 followed by a dismutation reaction yielding MPh2 and M(NPh2)2. The magnesium compounds [(diox)MgPh2]infinity (1) and (thf)2Mg(NPh2)2 (2) show tetracoordinate metal atoms, whereas in (dme)2Ca(NPh2)2 (3), (thf)4Sr(NPh2)2 (4), and (thf)4Ba(NPh2)2 (5) the metals are 6-fold coordinated. Additional agostic interactions between an ipso-carbon of one of the phenyl groups of the amide ligand and the alkaline earth metal atom lead to unsymmetric coordination of the NPh2 anions with two strongly different M-N-C angles in 3-5.
authors.affiliation: Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-Universität Jena, August-Bebel-Str. 2, D-07743 Jena, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Gärtner
authors.forename: Reinald
authors.initials: R
authors.lastname: Fischer
authors.forename: Jens
authors.initials: J
authors.lastname: Langer
authors.forename: Helmar
authors.initials: H
authors.lastname: Görls
authors.forename: Dirk
authors.initials: D
authors.lastname: Walther
authors.forename: Matthias
authors.initials: M
authors.lastname: Westerhausen